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D and F Block Elements

222 questions · Chemistry · JEE Main
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D and F Block Elements

222 questions · Chemistry · JEE Main

  1. The metal ions that have the calculated spin-only magnetic moment value of 4.9 B.M. are : A. Cr2+ B. Fe2+ C. Fe3+ D. Co2+ E. Mn3+ Choose the correct answer from the…2025 · 3 Apr · Shift 1 · Q15 · MCQ
  2. Consider the following reactions ​A+ Little  amount ​NaCl​+H2​SO4​→CrO2​Cl2​+ Side Products CrO2​Cl2 (Vapour) ​+NaOH→ B+NaCl+H2​O B+H+→C+H2​O​…2025 · 3 Apr · Shift 1 · Q22 · Numerical
  3. Given below are two statements: Statement I : CrO3​ is a stronger oxidizing agent than MoO3​ Statement II : Cr(VI) is more stable than Mo(VI) In the light of the above…2025 · 3 Apr · Shift 2 · Q10 · MCQ
  4. Among, Sc,Mn,Co and Cu , identify the element with highest enthalpy of atomisation. The spin only magnetic moment value of that element in its +2 oxidation state is ​ BM (in nearest…2025 · 3 Apr · Shift 2 · Q23 · Numerical
  5. Pair of transition metal ions having the same number of unpaired electrons is2025 · 4 Apr · Shift 1 · Q5 · MCQ
  6. The first transition series metal ' M' has the highest enthalpy of atomisation in its series. One of its aquated ion (Mn+) exists in green colour. The nature of the oxide formed by the above Mn+…2025 · 7 Apr · Shift 1 · Q7 · MCQ
  7. The correct decreasing order of spin only magnetic moment values (BM) of Cu+, Cu2+, Cr2+ and Cr3+ ions is :2025 · 8 Apr · Shift 2 · Q14 · MCQ
  8. Lanthanoid ions with 4f7 configuration are : (A) Eu2+(B) Gd3+(C) Eu3+(D) Tb3+(E) Sm2+ Choose the correct answer from the options given below :2025 · 22 Jan · Shift 1 · Q11 · MCQ
  9. Niobium (Nb) and ruthenium (Ru) have "x" and "y" number of electrons in their respective 4 d orbitals. The value of x+y is ​.2025 · 22 Jan · Shift 2 · Q23 · Numerical
  10. The correct set of ions (aqueous solution) with same colour from the following is:2025 · 23 Jan · Shift 1 · Q4 · MCQ
  11. Consider the following reactions K2​Cr2​O7​KOH−H2​O​[ A]H2​SO4​−H2​O​[ B]+K2​SO4​…2025 · 23 Jan · Shift 2 · Q19 · MCQ
  12. Match List - I with List - II Choose the correct answer from the options given below : Includes table2025 · 23 Jan · Shift 2 · Q3 · MCQ
  13. Which of the following ions is the strongest oxidizing agent? (Atomic Number of Ce=58,Eu=63, Tb=65,Lu=71)2025 · 24 Jan · Shift 1 · Q20 · MCQ
  14. Preparation of potassium permanganate from MnO2​ involves two step process in which the 1st step is a reaction with KOH and KNO3​ to produce2025 · 24 Jan · Shift 1 · Q6 · MCQ
  15. Match List - I with List - II. Choose the correct answer from the options given below : Includes table2025 · 24 Jan · Shift 2 · Q2 · MCQ
  16. The metal ion whose electronic configuration is not affected by the nature of the ligand and which gives a violet colour in non-luminous flame under hot condition in borax bead test is2025 · 28 Jan · Shift 1 · Q13 · MCQ
  17. The amphoteric oxide among V2​O3​, V2​O4​ and V2​O5​, upon reaction with alkali leads to formation of an oxide anion. The oxidation state of V in the oxide anion is :2025 · 28 Jan · Shift 2 · Q9 · MCQ
  18. The molar mass of the water insoluble product formed from the fusion of chromite ore (FeCr₂O₄) with Na₂CO₃ in presence of O₂ is ​ g mol⁻¹.2025 · 29 Jan · Shift 1 · Q21 · Numerical
  19. The correct option with order of melting points of the pairs (Mn, Fe), (Tc, Ru) and (Re, Os) is :2025 · 29 Jan · Shift 1 · Q7 · MCQ
  20. Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : In aqueous solutions Cr2+ is reducing while Mn3+ is oxidising in nature. Reason (R) :…2024 · 1 Feb · Shift 2 · Q13 · MCQ
  21. Consider the following reaction MnO2​+KOH+O2​→A+H2​O.  Product 'A' in neutral or acidic medium disproportionate to give products 'B' and…2024 · 4 Apr · Shift 1 · Q30 · Numerical
  22. The element which shows only one oxidation state other than its elemental form is :2024 · 4 Apr · Shift 1 · Q8 · MCQ
  23. A first row transition metal with highest enthalpy of atomisation, upon reaction with oxygen at high temperature forms oxides of formula M2​On​(where n=3,4,5). The 'spin-only' magnetic moment…2024 · 4 Apr · Shift 2 · Q30 · Numerical
  24. In a borax bead test under hot condition, a metal salt (one from the given) is heated at point B of the flame, resulted in green colour salt bead. The spin-only magnetic moment value of the salt is ​ BM (Nearest… Includes diagram2024 · 5 Apr · Shift 1 · Q23 · Numerical
  25. The metal that shows highest and maximum number of oxidation state is :2024 · 5 Apr · Shift 1 · Q8 · MCQ
  26. The number of ions from the following that have the ability to liberate hydrogen from a dilute acid is ​. Ti2+,Cr2+ and V2+2024 · 5 Apr · Shift 2 · Q15 · MCQ
  27. The fusion of chromite ore with sodium carbonate in the presence of air leads to the formation of products A and B along with the evolution of CO2​. The sum of spin-only magnetic moment values of A and B is…2024 · 5 Apr · Shift 2 · Q26 · Numerical
  28. While preparing crystals of Mohr's salt, dil H2​SO4​ is added to a mixture of ferrous sulphate and ammonium sulphate, before dissolving this mixture in water, dil H2​SO4​ is added here to :2024 · 5 Apr · Shift 2 · Q6 · MCQ
  29. The number of element from the following that do not belong to lanthanoids is Eu,Cm,Er,Tb,Yb and Lu2024 · 6 Apr · Shift 1 · Q1 · MCQ
  30. Among CrO,Cr2​O3​ and CrO3​, the sum of spin-only magnetic moment values of basic and amphoteric oxides is ​10−2BM(nearest integer). (Given atomic number of Cr…2024 · 6 Apr · Shift 1 · Q29 · Numerical
  31. Arrange the following elements in the increasing order of number of unpaired electrons in it. (A) Sc(B) Cr(C) V(D) Ti(E) Mn Choose the correct answer from the options given below :2024 · 6 Apr · Shift 2 · Q14 · MCQ
  32. Among VO2+​,MnO4−​ and Cr2​O72−​, the spin-only magnetic moment value of the species with least oxidising ability is ​ BM (Nearest integer). (Given atomic member V=23,Mn=25,Cr=24…2024 · 6 Apr · Shift 2 · Q27 · Numerical
  33. Iron (III) catalyses the reaction between iodide and persulphate ions, in which A. Fe3+ oxidises the iodide ion B. Fe3+ oxidises the persulphate ion C. Fe2+ reduces the iodide ion D. Fe2+…2024 · 8 Apr · Shift 1 · Q4 · MCQ
  34. Number of colourless lanthanoid ions among the following is ​. Eu3+,Lu3+,Nd3+,La3+,Sm3+2024 · 9 Apr · Shift 1 · Q24 · Numerical
  35. The electronic configuration of Cu(II) is 3 d9 whereas that of Cu(I) is 3 d10. Which of the following is correct?2024 · 9 Apr · Shift 1 · Q9 · MCQ
  36. A transition metal 'M' among Sc,Ti,V,Cr,Mn and Fe has the highest second ionisation enthalpy. The spin-only magnetic moment value of M+ ion is ​…2024 · 9 Apr · Shift 2 · Q25 · Numerical
  37. The electronic configuration of Einsteinium is : (Given atomic number of Einsteinium =99)2024 · 9 Apr · Shift 2 · Q4 · MCQ
  38. Give below are two statements : Statement I : The higher oxidation states are more stable down the group among transition elements unlike p-block elements. Statement II : Copper can not liberate hydrogen from weak acids. In the light of…2024 · 9 Apr · Shift 2 · Q6 · MCQ
  39. NaCl reacts with conc. H2​SO4​ and K2​Cr2​O7​ to give reddish fumes (B), which react with NaOH to give yellow solution (C). (B) and (C) respectively are ;2024 · 27 Jan · Shift 1 · Q18 · MCQ
  40. The electronic configuration for Neodymium is: [Atomic Number for Neodymium 60]2024 · 27 Jan · Shift 1 · Q20 · MCQ
  41. Which of the following electronic configuration would be associated with the highest magnetic moment?2024 · 27 Jan · Shift 1 · Q5 · MCQ
  42. Given below are two statements : Statement (I) : In the Lanthanoids, the formation Ce+4 is favoured by its noble gas configuration. Statement (II) : Ce+4 is a strong oxidant reverting to the common +3 state. In…2024 · 27 Jan · Shift 2 · Q14 · MCQ
  43. Choose the correct option having all the elements with d10 electronic configuration from the following :2024 · 27 Jan · Shift 2 · Q15 · MCQ
  44. Total number of ions from the following with noble gas configuration is ​. Sr2+(z=38),Cs+(z=55),La2+(z=57),Pb2+(z=82),Yb2+(z=70) and Fe2+(z=26)…2024 · 27 Jan · Shift 2 · Q29 · Numerical
  45. KMnO4​ decomposes on heating at 513 K to form O2​ along with2024 · 29 Jan · Shift 1 · Q17 · MCQ
  46. The correct IUPAC name of K2​MnO4​ is2024 · 29 Jan · Shift 2 · Q10 · MCQ
  47. Which of the following acts as a strong reducing agent? (Atomic number: Ce=58,Eu=63,Gd=64,Lu=71)2024 · 29 Jan · Shift 2 · Q3 · MCQ
  48. Which of the following statements are correct about Zn,Cd and Hg? A. They exhibit high enthalpy of atomization as the d-subshell is full. B. Zn and Cd do not show variable oxidation…2024 · 29 Jan · Shift 2 · Q8 · MCQ
  49. Diamagnetic Lanthanoid ions are :2024 · 30 Jan · Shift 1 · Q15 · MCQ
  50. The orange colour of K2​Cr2​O7​ and purple colour of KMnO4​ is due to2024 · 30 Jan · Shift 2 · Q17 · MCQ
  51. Number of metal ions characterized by flame test among the following is ​. Sr2+,Ba2+,Ca2+,Cu2+,Zn2+,Co2+,Fe2+2024 · 30 Jan · Shift 2 · Q22 · Numerical
  52. Identify correct statements from below: A. The chromate ion is square planar. B. Dichromates are generally prepared from chromates. C. The green manganate ion is diamagnetic. D. Dark green coloured K2​MnO4​…2024 · 31 Jan · Shift 1 · Q14 · MCQ
  53. The metals that are employed in the battery industries are A. Fe B. Mn C. Ni D. Cr E. Cd Choose the correct answer from the options given below:2024 · 31 Jan · Shift 1 · Q15 · MCQ
  54. Choose the correct statements from the following A. Mn2​O7​ is an oil at room temperature B. V2​O4​ reacts with acid to give VO2​2+ C. CrO is a basic oxide D. V2​O5​…2024 · 31 Jan · Shift 2 · Q10 · MCQ
  55. Highest oxidation state of Mn is exhibited in Mn2​O7​. The correct statements about Mn2​O7​ are (A) Mn is tetrahedrally surrounded by oxygen atoms. (B) Mn is octahedrally surrounded by oxygen atoms. (C) Contains Mn−O−Mn…2023 · 1 Feb · Shift 1 · Q3 · MCQ
  56. Among following compounds, the number of those present in copper matte is ​. A. CuCO3​ B. Cu2​S C. Cu2​O D. FeO2023 · 1 Feb · Shift 2 · Q16 · Numerical
  57. Which element is not present in Nessler's reagent?2023 · 1 Feb · Shift 2 · Q6 · MCQ
  58. Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Cu2+ in water is more stable than Cu+. Reason (R) : Enthalpy of hydration for Cu2+…2023 · 1 Feb · Shift 2 · Q8 · MCQ
  59. Strong reducing and oxidizing agents among the following, respectively, are :2023 · 6 Apr · Shift 1 · Q12 · MCQ
  60. Element not present in Nessler's reagent is :2023 · 6 Apr · Shift 2 · Q2 · MCQ
  61. Given below are two statements: one is labelled as "Assertion A" and the other is labelled as "Reason R" Assertion A : In the complex Ni(CO)4​ and Fe(CO)5​, the metals have zero oxidation state.…2023 · 6 Apr · Shift 2 · Q7 · MCQ
  62. During the reaction of permanganate with thiosulphate, the change in oxidation of manganese occurs by value of 3. Identify which of the below medium will favour the reaction.2023 · 6 Apr · Shift 2 · Q9 · MCQ
  63. Which halogen is known to cause the reaction given below : 2Cu2++4X−→Cu2​X2​(s)+X2​2023 · 8 Apr · Shift 1 · Q7 · MCQ
  64. In chromyl chloride, the number of d-electrons present on chromium is same as in (Given at no. of Ti:22, V:23,Cr:24,Mn:25,Fe:26 )2023 · 8 Apr · Shift 1 · Q8 · MCQ
  65. Prolonged heating is avoided during the preparation of ferrous ammonium sulphate to :2023 · 10 Apr · Shift 1 · Q5 · MCQ
  66. Which of the following statements are correct? (A) The M 3+/M 2+ reduction potential for iron is greater than manganese. (B) The higher oxidation states of first row d-block elements get stabilized by oxide ion. (C) Aqueous…2023 · 10 Apr · Shift 1 · Q6 · MCQ
  67. Given below are two statement: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: 5f electrons can participate in bonding to a far greater extent than 4f…2023 · 12 Apr · Shift 1 · Q6 · MCQ
  68. The pair of lanthanides in which both elements have high third - ionization energy is :2023 · 13 Apr · Shift 1 · Q9 · MCQ
  69. In Chromyl chloride, the oxidation state of chromium is (+)​.2023 · 15 Apr · Shift 1 · Q18 · Numerical
  70. The total change in the oxidation state of manganese involved in the reaction of KMnO4​ and potassium iodide in the acidic medium is ​.2023 · 15 Apr · Shift 1 · Q21 · Numerical
  71. An ammoniacal metal salt solution gives a brilliant red precipitate on addition of dimethylglyoxime. The metal ion is :2023 · 24 Jan · Shift 1 · Q5 · MCQ
  72. Which one amongst the following are good oxidizing agents? A. Sm 2+ B. Ce 2+ C. Ce 4+ D. Tb 4+ Choose the most appropriate answer from the options given below :2023 · 24 Jan · Shift 2 · Q8 · MCQ
  73. How many of the following metal ions have similar value of spin only magnetic moment in gaseous state? ​ (Given : Atomic number V, 23; Cr, 24; Fe, 26; Ni, 28) V 3+, Cr 3+, Fe 2+, Ni 3+2023 · 25 Jan · Shift 1 · Q20 · Numerical
  74. A chloride salt solution acidified with dil.HNO 3​ gives a curdy white precipitate, [A], on addition of AgNO 3​. [A] on treatment with NH 4​ OH gives a clear solution B. A and B are respectively :2023 · 25 Jan · Shift 2 · Q11 · MCQ
  75. An indicator 'X' is used for studying the effect of variation in concentration of iodide on the rate of reaction of iodide ion with H2​O2​ at room temp. The indicator 'X' forms blue coloured complex with compound 'A' present in…2023 · 29 Jan · Shift 2 · Q13 · MCQ
  76. Given below are two statements : Statement I : Nickel is being used as the catalyst for producing syn gas and edible fats. Statement II : Silicon forms both electron rich and electron deficient hydrides. In the light of the above…2023 · 29 Jan · Shift 2 · Q2 · MCQ
  77. The set of correct statements is : (i) Manganese exhibits +7 oxidation state in its oxide. (ii) Ruthenium and Osmium exhibit +8 oxidation in their oxides. (iii) Sc shows +4 oxidation state which is oxidizing in nature. (iv) Cr shows…2023 · 29 Jan · Shift 2 · Q7 · MCQ
  78. The number of electrons involved in the reduction of permanganate to manganese dioxide in acidic medium is ​.2023 · 30 Jan · Shift 1 · Q20 · Numerical
  79. During the qualitative analysis of SO32−​ using dilute H2​SO4​,SO2​ gas is evolved which turns K2​Cr2​O7​ solution (acidified with dilute H2​SO4​…2023 · 30 Jan · Shift 1 · Q8 · MCQ
  80. Formulae for Nessler's reagent is :2023 · 30 Jan · Shift 2 · Q1 · MCQ
  81. KMnO4​ oxidises I− in acidic and neutral/faintly alkaline solutions, respectively, to :2023 · 30 Jan · Shift 2 · Q7 · MCQ
  82. When Cu2+ ion is treated with KI, a white precipitate, X appears in solution. The solution is titrated with sodium thiosulphate, the compound Y is formed. X and Y…2023 · 31 Jan · Shift 1 · Q1 · MCQ
  83. Nd2+ = ​2023 · 31 Jan · Shift 1 · Q4 · MCQ
  84. The correct order of basicity of oxides of vanadium is :2023 · 31 Jan · Shift 1 · Q5 · MCQ
  85. The difference in oxidation state of chromium in chromate and dichromate salts is ​.2022 · 24 Jun · Shift 1 · Q17 · Numerical
  86. Manganese (VI) has ability to disproportionate in acidic solution. The difference in oxidation states of two ions it forms in acidic solution is ​.2022 · 24 Jun · Shift 2 · Q18 · Numerical
  87. Metals generally melt at very high temperature. Amongst the following, the metal with the highest melting point will be :2022 · 24 Jun · Shift 2 · Q6 · MCQ
  88. Among Co3+, Ti2+, V2+ and Cr2+ ions, one if used as a reagent cannot liberate H2​ from dilute mineral acid solution, its spin-only magnetic moment in gaseous state is ​ B.M. (Nearest integer)2022 · 25 Jul · Shift 1 · Q17 · Numerical
  89. Cerium (IV) has a noble gas configuration. Which of the following is correct statement about it?2022 · 25 Jun · Shift 1 · Q5 · MCQ
  90. Among the following, which is the strongest oxidizing agent?2022 · 25 Jun · Shift 1 · Q6 · MCQ
  91. The metal ion (in gaseous state) with lowest spin-only magnetic moment value is :2022 · 25 Jun · Shift 2 · Q8 · MCQ
  92. The dark purple colour of KMnO4​ disappears in the titration with oxalic acid in acidic medium. The overall change in the oxidation number of manganese in the reaction is :2022 · 26 Jul · Shift 1 · Q5 · MCQ
  93. The spin-only magnetic moment value of the compound with strongest oxidizing ability among MnF4​,MnF3​ and MnF2​ is ​ B.M. [nearest integer]2022 · 26 Jul · Shift 2 · Q17 · Numerical
  94. The spin-only magnetic moment value of the most basic oxide of vanadium among V2​O3​, V2​O4​ and V2​O5​ is ​ B.M. (Nearest integer)2022 · 26 Jun · Shift 1 · Q16 · Numerical
  95. The most common oxidation state of Lanthanoid elements is +3. Which of the following is likely to deviate easily from +3 oxidation state?2022 · 26 Jun · Shift 2 · Q6 · MCQ
  96. Given below are two statements. Statement I : Iron (III) catalyst, acidified K2​Cr2​O7​ and neutral KMnO4​ have the ability to oxidise I− to I2​ independently.…2022 · 27 Jul · Shift 1 · Q7 · MCQ
  97. The total number of Mn=O bonds in Mn2​O7​ is ​.2022 · 27 Jul · Shift 1 · Q8 · MCQ
  98. In neutral or alkaline solution, MnO4−​ oxidises thiosulphate to :2022 · 27 Jul · Shift 2 · Q6 · MCQ
  99. The number of statements correct from the following for Copper (at. no. 29) is/are ​. (A) Cu(II) complexes are always paramagnetic. (B) Cu(I) complexes are generally colourless (C) Cu(I) is easily oxidized (D) In…2022 · 27 Jun · Shift 1 · Q16 · Numerical
  100. The 'f' orbitals are half and completely filled, respectively in lanthanide ions : [Given : Atomic no. Eu, 63; Sm, 62; Tm, 69; Tb, 65; Yb, 70; Dy, 66]2022 · 27 Jun · Shift 2 · Q6 · MCQ
  101. The disproportionation of MnO42−​ in acidic medium resulted in the formation of two manganese compounds A and B. If the oxidation state of Mn in B is smaller than that of A, then…2022 · 28 Jul · Shift 1 · Q20 · Numerical
  102. Match List - I with List - II, match the gas evolved during each reaction. Choose the correct answer from the options given below : Includes table2022 · 28 Jul · Shift 1 · Q5 · MCQ
  103. Which of the following has least tendency to liberate H2​ from mineral acids?2022 · 28 Jul · Shift 1 · Q6 · MCQ
  104. Which of the following pair is not isoelectronic species? (At. no. Sm, 62; Er, 68; Yb, 70; Lu, 71; Eu, 63; Tb, 65; Tm, 69)2022 · 28 Jul · Shift 2 · Q3 · Multiple correct
  105. Which one of the lanthanoids given below is the most stable in divalent form?2022 · 28 Jun · Shift 1 · Q3 · MCQ
  106. The reaction of zinc with excess of aqueous alkali, evolves hydrogen gas and gives :2022 · 29 Jul · Shift 1 · Q4 · MCQ
  107. In following pairs, the one in which both transition metal ions are colourless is :2022 · 29 Jul · Shift 1 · Q6 · MCQ
  108. In neutral or faintly alkaline medium, KMnO4​ being a powerful oxidant can oxidize, thiosulphate almost quantitatively, to sulphate. In this reaction overall change in oxidation state of manganese will be :2022 · 29 Jul · Shift 1 · Q7 · MCQ
  109. Which of the following 3d-metal ion will give the lowest enthalpy of hydration (Δhyd ​H) when dissolved in water ?2022 · 29 Jul · Shift 2 · Q7 · MCQ
  110. The number of terminal oxygen atoms present in the product B obtained from the following reaction is ​. FeCr2​O4​ + Na2​CO3​ + O2​ → A + Fe2​O3​ + CO2​ A + H+→ B + H2​O + Na+2022 · 29 Jun · Shift 1 · Q15 · Numerical
  111. An acidified manganate solution undergoes disproportionation reaction. The spin-only magnetic moment value of the product having manganese in higher oxidation state is ​ B.M. (Nearest integer)2022 · 29 Jun · Shift 1 · Q16 · Numerical
  112. The electronic configuration of Pt (atomic number 78) is :2022 · 29 Jun · Shift 1 · Q4 · MCQ
  113. Spin only magnetic moment of [MnBr6​]4− is ​ B.M. (round off to the closest integer)2022 · 29 Jun · Shift 2 · Q19 · Numerical
  114. For the reaction given below : CoCl3​ . xNH3​ + AgNO3​ (aq) → If two equivalents of AgCl precipitate out, then the value of x will be ​.2022 · 29 Jun · Shift 2 · Q20 · Numerical
  115. Identify the element for which electronic configuration in +3 oxidation state is [Ar]3d5​ :2021 · 1 Sep · Shift 2 · Q14 · MCQ
  116. In the given chemical reaction, colors of the Fe2+ and Fe3+ ions, are respectively : 5Fe2+ + MnO 4−​+ 8H+→ Mn2+ + 4H2​O + 5Fe3+2021 · 1 Sep · Shift 2 · Q7 · MCQ
  117. Given below are two statement : one is labelled as Assertion A and the other is labelled as Reason R : Assertion A : Size of Bk3+ ion is less than Np3+ ion. Reason R : The above is a consequence of the lanthanoid contraction. In…2021 · 16 Mar · Shift 1 · Q12 · MCQ
  118. Given below are two statements : Statement I : The Eo value for Ce4+ / Ce3+ is + 1.74 V. Statement II : Ce is more stable in Ce4+ state than Ce3+ state. In the light of the above statements, choose the most appropriate…2021 · 16 Mar · Shift 1 · Q5 · MCQ
  119. Arrange the following metal complex/compounds in the increasing order of spin only magnetic moment. Presume all the three, high spin system. (Atomic numbers Ce = 58, Gd = 64 and Eu = 63) (a) (NH4​)2​[Ce(NO3​)6​] (b) Gd(NO3​)3​ and (c) Eu(NO3​)3​…2021 · 16 Mar · Shift 2 · Q12 · MCQ
  120. Fex2 and Fey3 are known when x and y are :2021 · 16 Mar · Shift 2 · Q9 · MCQ
  121. What is the spin-only magnetic moment value (BM) of a divalent metal ion with atomic number 25, in it's aqueous solution?2021 · 17 Mar · Shift 1 · Q2 · MCQ
  122. Given below are two statements : Statement I : Potassium permanganate on heating at 573K forms potassium manganate. Statement II : Both potassium permanganate and potassium manganate are tetrahedral and paramagnetic in nature. In the light…2021 · 17 Mar · Shift 1 · Q8 · MCQ
  123. The common positive oxidation states for an element with atomic number 24, are :2021 · 17 Mar · Shift 2 · Q12 · MCQ
  124. In the ground state of atomic Fe(Z = 26), the spin-only magnetic moment is ​× 10 − 1 BM. (Round off to the Nearest Integer). [Given : 3​= 1.73, 2​ = 1.41 ]2021 · 17 Mar · Shift 2 · Q18 · Numerical
  125. Match List - I with List - II Choose the most appropriate answer from the options given below : Includes table2021 · 18 Mar · Shift 1 · Q7 · MCQ
  126. The oxide that shows magnetic property is :2021 · 18 Mar · Shift 2 · Q5 · MCQ
  127. The set having ions which are coloured and paramagnetic both is :2021 · 22 Jul · Shift 2 · Q10 · MCQ
  128. Number of electrons that Vanadium (Z = 23) has in p-orbitals is equal to ​2021 · 22 Jul · Shift 2 · Q21 · Numerical
  129. Given below are two statements : Statement I : Colourless cupric metaborate is reduced to cuprous metaborate in a luminous flame. Statement II : Cuprous metaborate is obtained by heating boric anhydride and copper sulphate in a…2021 · 24 Feb · Shift 1 · Q7 · MCQ
  130. What is the correct order of the following elements with respect to their density?2021 · 24 Feb · Shift 2 · Q10 · MCQ
  131. The incorrect statement among the following is :2021 · 24 Feb · Shift 2 · Q2 · MCQ
  132. In which of the following pairs, the outer most electronic configuration will be the same?2021 · 25 Feb · Shift 1 · Q13 · MCQ
  133. Given below are two statements : Statement I : CeO2​ can be used for oxidation of aldehydes and ketones. Statement II : Aqueous solution of EuSO4​ is a strong reducing agent. In the light of the above statements, choose the correct…2021 · 25 Feb · Shift 1 · Q5 · MCQ
  134. The correct order of following 3d metal oxides, according to their oxidation numbers is : (a) CrO3​, (b) Fe2​O3​, (c) MnO2​, (d) V2​O5​, (e) Cu2​O2021 · 25 Jul · Shift 1 · Q12 · MCQ
  135. Which one of the following metals forms interstitial hydride easily?2021 · 25 Jul · Shift 2 · Q10 · MCQ
  136. Number of electrons present in 4f orbital of Ho3+ ion is ​. (Given Atomic No. of Ho = 67)2021 · 25 Jul · Shift 2 · Q18 · Numerical
  137. The spin only magnetic moments (in BM) for free Ti3+, V2+ and Sc3+ ions respectively are : (At.No. Sc : 21, Ti : 22, V : 23)2021 · 25 Jul · Shift 2 · Q7 · MCQ
  138. The number of 4f electrons in the ground statement electronic configuration of Gd2+ is ​. [Atomic number of Gd = 64]2021 · 26 Aug · Shift 1 · Q17 · Numerical
  139. Which one of the following when dissolved in water gives coloured solution in nitrogen atmosphere?2021 · 26 Aug · Shift 1 · Q2 · MCQ
  140. Which one of the following lanthanoids does not form MO2​? [M is lanthanoid metal]2021 · 26 Feb · Shift 1 · Q7 · MCQ
  141. In mildly alkaline medium, thiosulphate ion is oxidized by MnO4−​ to "A". The oxidation state of sulphur in "A" is ​.2021 · 26 Feb · Shift 2 · Q19 · Numerical
  142. The number of f electrons in the ground state electronic configuration of Np (Z = 93) is ​. (Nearest integer)2021 · 27 Aug · Shift 1 · Q19 · Numerical
  143. The nature of oxides V2​O3​ and CrO is indexed as 'X' and 'Y' type respectively. The correct set of X and Y is :2021 · 27 Aug · Shift 1 · Q8 · MCQ
  144. The addition of dilute NaOH to Cr3+ salt solution will give :2021 · 27 Aug · Shift 2 · Q1 · MCQ
  145. Potassium permanganate on heating at 513 K gives a product which is :2021 · 27 Aug · Shift 2 · Q9 · MCQ
  146. In the structure of the dichromate ion, there is a :2021 · 31 Aug · Shift 1 · Q2 · MCQ
  147. Which one of the following lanthanides exhibits +2 oxidation state with diamagnetic nature? (Given Z for Nd = 60, Yb = 70, La = 57, Ce = 58)2021 · 31 Aug · Shift 1 · Q5 · MCQ
  148. The value of magnetic quantum number of the outermost electron of Zn+ ion is ​.2021 · 31 Aug · Shift 2 · Q16 · Numerical
  149. The Eu2+ ion is a strong reducing agent in spite of its ground state electronic configuration (outermost) : [Atomic number of Eu = 63]2021 · 31 Aug · Shift 2 · Q2 · MCQ
  150. In which one of the following sets all species show disproportionation reaction?2021 · 31 Aug · Shift 2 · Q4 · MCQ
  151. The incorrect statement is :2020 · 3 Sep · Shift 2 · Q7 · MCQ
  152. The elements with atomic numbers 101 and 104 belong to, respectively :2020 · 4 Sep · Shift 1 · Q3 · MCQ
  153. The incorrect statement(s) among (a) - (c) is (are) (a) W(VI) is more stable than Cr(VI). (b) In the presence of HCl, permanganate titrations provide satisfactory results. (c) Some lanthanoid oxides can be used as phosphors.2020 · 4 Sep · Shift 2 · Q4 · MCQ
  154. In the sixth period, the orbitals that are filled are :2020 · 5 Sep · Shift 1 · Q19 · MCQ
  155. The correct electronic configuration and spin-only magnetic moment (BM) of Gd3+ (Z = 64), respectively, are :2020 · 5 Sep · Shift 1 · Q8 · MCQ
  156. The lanthanoid that does NOT show +4 oxidation state is :2020 · 6 Sep · Shift 1 · Q12 · MCQ
  157. The set that contains atomic numbers of only transition elements, is :2020 · 6 Sep · Shift 1 · Q5 · MCQ
  158. Mischmetal is an alloy consisting mainly of :2020 · 6 Sep · Shift 2 · Q3 · MCQ
  159. The atomic radius of Ag is closed to :2020 · 7 Jan · Shift 1 · Q22 · MCQ
  160. Consider the following reactions : NaCl+K2​Cr2​O7​+(conc.)H2​SO4​​→ (A) + side products (A) + NaOH → (B) + Side products (B)+(dilute)H2​SO4​​+H2​O2​…2020 · 7 Jan · Shift 2 · Q20 · Numerical
  161. 5 g of zinc is treated separately with an excess of (a) dilute hydrochloric acid and (b) aqueous sodium hydroxide. The ratio of the volumes of H2​ evolved in these two reactions is :2020 · 9 Jan · Shift 2 · Q15 · MCQ
  162. The sum of the total number of bonds between chromium and oxygen atoms in chromate and dichromate ions is ​.2020 · 9 Jan · Shift 2 · Q7 · Numerical
  163. The statement that is INCORRECT about the interstitial compounds is :2019 · 8 Apr · Shift 2 · Q10 · MCQ
  164. The maximum number of possible oxidation states of actinoides are shown by :2019 · 9 Apr · Shift 2 · Q3 · MCQ
  165. The transition element that has lowest enthalpy of atomisation, is :2019 · 9 Jan · Shift 2 · Q15 · MCQ
  166. Consider the hydrated ions of Ti2+, V2+, Ti3+, and Sc3+. The correct order of their spin-only magnetic moments is :2019 · 10 Apr · Shift 1 · Q17 · MCQ
  167. The correct order of the first ionization enthalpies is :2019 · 10 Apr · Shift 2 · Q11 · MCQ
  168. The INCORRECT statement is :2019 · 10 Apr · Shift 2 · Q16 · MCQ
  169. The highest possible oxidation states of uranium and plutonium, respectively are :2019 · 10 Apr · Shift 2 · Q19 · MCQ
  170. The effect of lanthanoid contraction in the lanthanoid series of elements by and large means :2019 · 10 Jan · Shift 1 · Q16 · MCQ
  171. Wilkinson catalyst is : (Et = C2​H5​)2019 · 10 Jan · Shift 1 · Q17 · MCQ
  172. The 71st electron of an element X with an atomic number of 71 enters into the orbital :2019 · 10 Jan · Shift 2 · Q19 · MCQ
  173. The element that usually does NOT show variable oxidation states is :2019 · 11 Jan · Shift 1 · Q6 · MCQ
  174. A​4KOH,O2​​(Green)2B​​+2H2​O3B​4HCl​(Purple)2C​​+MnO2​+2H2​O2C​H2​O.KI​(Purple)2A​​+2KOH+D​…2019 · 11 Jan · Shift 2 · Q16 · MCQ
  175. The pair that has similar atomic radii is :2019 · 12 Apr · Shift 2 · Q12 · MCQ
  176. The correct order of atomic radii is :2019 · 12 Jan · Shift 2 · Q5 · MCQ
  177. When XO2​ is fused with an alkali metal hydroxide in presence of an oxidizing agent such as KNO3​ ; a dark green product is formed which disproportioates in acidic solution to afforda dark purple solution. X is :2018 · 16 Apr · Shift 1 · Q17 · MCQ
  178. The incorrect statement is :2018 · 16 Apr · Shift 1 · Q22 · MCQ
  179. The pair of compounds having metals in their highest oxidation state is :2017 · 8 Apr · Shift 1 · Q18 · MCQ
  180. Which of the following ions does not liberate hydrogen gas on reaction with dilute acids ?2017 · 9 Apr · Shift 1 · Q9 · MCQ
  181. In the following reactions, ZnO is respectively acting as a/an : (a) ZnO + Na2​O → Na2​ZnO2​ (b) ZnO + CO2​ → ZnCO3​2017 · Shift 0 · Q12 · MCQ
  182. Which one of the following species is stable in aqueous solution?2016 · 9 Apr · Shift 1 · Q9 · MCQ
  183. The transition metal ions responsible for color in ruby and emerald are, respectively :2016 · 10 Apr · Shift 1 · Q9 · MCQ
  184. Which of the following compounds is metallic and ferromagnetic ?2016 · Shift 0 · Q17 · MCQ
  185. The reaction of zinc with dilute and concentrated nitric acid, respectively, produces :2016 · Shift 0 · Q7 · MCQ
  186. The colour of KMnO4​ is due to :2015 · Shift 0 · Q16 · MCQ
  187. Match the catalysts to the correct processes : Includes table2015 · Shift 0 · Q9 · MCQ
  188. Which series of reactions correctly represents chemical relations related to iron and its compound?2014 · Shift 0 · Q19 · MCQ
  189. Four successive members of the first row transition elements are listed below with atomic numbers. Which one of them is expected to have the highest EM3+/M2+0​ value?2013 · Shift 0 · Q12 · MCQ
  190. Which of the following arrangements does not represent the correct order of the property stated against it?2013 · Shift 0 · Q13 · MCQ
  191. Iron exhibits + 2 and +3 oxidation states. Which of the following statements about iron is incorrect?2012 · Shift 0 · Q16 · MCQ
  192. In context of the lanthanoids, which of the following statements is not correct?2011 · Shift 0 · Q19 · MCQ
  193. The outer electron configuration of Gd(Atomic No. 64) is :2011 · Shift 0 · Q9 · MCQ
  194. Knowing that the Chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect?2009 · Shift 0 · Q17 · MCQ
  195. In context with the transition elements, which of the following statements is incorrect ?2009 · Shift 0 · Q18 · MCQ
  196. Amount of oxalic acid present in a solution can be determined by its titration with KMnO4​ solution in the presence of H2​SO4​. The titration gives unsatisfactory result when carried out in the presence of HCl, because HCl :2008 · Shift 0 · Q11 · MCQ
  197. Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids, the main reason being :2008 · Shift 0 · Q20 · MCQ
  198. The actinoids exhibits more number of oxidation states in general than the lanthanoids. This is because :2007 · Shift 0 · Q10 · MCQ
  199. Identify the incorrect statement among the following :2007 · Shift 0 · Q21 · MCQ
  200. A metal, M forms chlorides in its +2 and +4 oxidation states. Which of the following statements about these chlorides is correct?2006 · Shift 0 · Q27 · MCQ