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Periodic Table and Periodicity

162 questions · Chemistry · JEE Main
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Periodic Table and Periodicity

162 questions · Chemistry · JEE Main

  1. The property/properties that show irregularity in first four elements of group-17 is/are (A) Covalent radius (B) Electron affinity (C) Ionic radius (D) First ionization energy Choose the correct answer from the options given below :2025 · 2 Apr · Shift 1 · Q19 · MCQ
  2. Given below are two statements : Statement (I) : The metallic radius of Al is less than that of Ga . Statement (II) : The ionic radius of Al3+ is less than that of Ga3+. In the light of the above statements,…2025 · 2 Apr · Shift 1 · Q4 · MCQ
  3. Electronic configuration of four elements A, B, C and D are given below : (A) 1s22s22p3(B) 1s22s22p4(C) 1s22s22p5(D) 1s22s22p2 Which of the following is the correct order of increasing…2025 · 2 Apr · Shift 2 · Q3 · MCQ
  4. Which of the following statements are correct? A. The process of adding an electron to a neutral gaseous atom is always exothermic. B. The process of removing an electron from an isolated gaseous atom is always endothermic. C. The 1st …2025 · 3 Apr · Shift 1 · Q2 · MCQ
  5.  Match the LIST-I with LIST-II  Choose the correct answer from the options given below: Includes table2025 · 3 Apr · Shift 2 · Q14 · MCQ
  6. The correct orders among the following are Atomic radius : BElectronegativity:\mathrm{Al}Density : Tl1stIonisationEnergy:\mathrm{In}Choose the correct answer from the options given below:2025 · 3 Apr · Shift 2 · Q6 · MCQ
  7. The incorrect relationship in the following pairs in relation to ionisation enthalpies is :2025 · 4 Apr · Shift 2 · Q10 · MCQ
  8. The elements of Group 13 with highest and lowest first ionisation enthalpies are respectively :2025 · 4 Apr · Shift 2 · Q20 · MCQ
  9. The group 14 elements A and B have the first ionisation enthalpy values of 708 and 715 kJ mol−1 respectively. The above values are lowest among their group members. The nature of their ions A2+…2025 · 7 Apr · Shift 1 · Q15 · MCQ
  10. The number of valence electrons present in the metal among Cr,Co,Fe and Ni which has the lowest enthalpy of atomisation is :2025 · 7 Apr · Shift 1 · Q8 · MCQ
  11. Choose the incorrect trend in the atomic radii (r) of the elements.2025 · 7 Apr · Shift 2 · Q10 · MCQ
  12. The atomic number of the element from the following with lowest 1st ionisation enthalpy is :2025 · 8 Apr · Shift 2 · Q1 · MCQ
  13. Given below are two statements: Statement I: H2​Se is more acidic than H2​Te Statement II: H2​Se has higher bond enthalpy for dissociation than H2​Te In the light of the above statements, choose the correct answer from the options…2025 · 8 Apr · Shift 2 · Q12 · MCQ
  14. Which of the following electronegativity order is incorrect?2025 · 22 Jan · Shift 1 · Q14 · MCQ
  15. Match List-I with List-II. Choose the correct answer from the options given below : Includes table2025 · 22 Jan · Shift 1 · Q6 · MCQ
  16. Given below are two statements : Statement (I) : An element in the extreme left of the periodic table forms acidic oxides. Statement (II) : Acid is formed during the reaction between water and oxide of a reactive element present in the…2025 · 22 Jan · Shift 2 · Q17 · MCQ
  17. The element that does not belong to the same period of the remaining elements (modern periodic table) is:2025 · 23 Jan · Shift 1 · Q16 · MCQ
  18. Given below are the atomic numbers of some group 14 elements. The atomic number of the element with lowest melting point is :2025 · 23 Jan · Shift 2 · Q5 · MCQ
  19. Which of the following statements are NOT true about the periodic table? A. The properties of elements are function of atomic weights. B. The properties of elements are function of atomic numbers. C. Elements having similar outer…2025 · 24 Jan · Shift 1 · Q11 · MCQ
  20. The successive 5 ionisation energies of an element are 800,2427,3658,25024 and 32824 kJ/mol, respectively. By using the above values predict the group in which the above element is present :2025 · 24 Jan · Shift 2 · Q1 · MCQ
  21. Given below are two statements : Statement (I) : The first ionization energy of Pb is greater than that of Sn . Statement (II) : The first ionization energy of Ge is greater than that of Si . In the light of the above statements, choose…2025 · 24 Jan · Shift 2 · Q9 · MCQ
  22. The incorrect decreasing order of atomic radii is2025 · 28 Jan · Shift 1 · Q1 · MCQ
  23. Consider the following elements In,Tl,Al,Pb,Sn and Ge . The most stable oxidation states of elements with highest and lowest first ionisation enthalpies, respectively, are2025 · 28 Jan · Shift 1 · Q10 · MCQ
  24. Given below are two statements : Statement I : According to the Law of Octaves, the elements were arranged in the increasing order of their atomic number. Statement II : Meyer observed a periodically repeated pattern upon plotting physical…2025 · 28 Jan · Shift 2 · Q18 · MCQ
  25. An element ‘E’ has the ionisation enthalpy value of 374 kJ mol⁻¹. ‘E’ reacts with elements A, B, C and D with electron gain enthalpy values of −328, −349, −325 and −295 kJ mol⁻¹, respectively. The correct order of the products EA, EB, EC…2025 · 29 Jan · Shift 1 · Q19 · MCQ
  26. Given below are two statements : Statement (I) : The radii of isoelectronic species increases in the order. Mg2+ < Na+ < F − < O2− Statement (II) : The magnitude of electron gain enthalpy of halogen decreases in the…2025 · 29 Jan · Shift 1 · Q20 · MCQ
  27. First ionisation enthalpy values of first four group 15 elements are given below. Choose the correct value for the element that is a main component of apatite family :2025 · 29 Jan · Shift 2 · Q13 · MCQ
  28. The type of oxide formed by the element among Li, Na, Be, Mg, B and Al that has the least atomic radius is :2025 · 29 Jan · Shift 2 · Q6 · MCQ
  29. Given below are two statements : Statement (I) : Both metals and non-metals exist in p and d-block elements. Statement (II) : Non-metals have higher ionisation enthalpy and higher electronegativity than the metals. In the light of the…2024 · 1 Feb · Shift 2 · Q18 · MCQ
  30. The transition metal having highest 3rd  ionisation enthalpy is :2024 · 1 Feb · Shift 2 · Q6 · MCQ
  31. The correct order of first ionization enthalpy values of the following elements is : (A) O (B) N (C) Be (D) F (E) B Choose the correct answer from the options given below :2024 · 4 Apr · Shift 1 · Q16 · MCQ
  32. Number of elements from the following that CANNOT form compounds with valencies which match with their respective group valencies is ​. B, C, N, S, O, F, P, Al, Si2024 · 4 Apr · Shift 1 · Q20 · MCQ
  33. The correct order of the first ionization enthalpy is2024 · 4 Apr · Shift 2 · Q7 · MCQ
  34. Given below are two statements : Statement I : The correct order of first ionization enthalpy values of Li,Na,F and Cl is NaStatementII:Thecorrectorderofnegativeelectrongainenthalpyvaluesof…2024 · 4 Apr · Shift 2 · Q8 · MCQ
  35. The statement(s) that are correct about the species O2−,F−,Na+ and Mg2+. (A) All are isoelectronic (B) All have the same nuclear charge (C) O2− has the largest ionic radii…2024 · 5 Apr · Shift 1 · Q17 · MCQ
  36. Given below are two statements: Statement I: In group 13, the stability of +1 oxidation state increases down the group. Statement II : The atomic size of gallium is greater than that of aluminium. In the light of the above statements,…2024 · 5 Apr · Shift 1 · Q7 · MCQ
  37. Given below are two statements : Statement I : The metallic radius of Na is 1.86 A∘ and the ionic radius of Na+ is lesser than 1.86 A∘ Statement II : Ions are always smaller in…2024 · 5 Apr · Shift 2 · Q20 · MCQ
  38. The electron affinity value are negative for A. Be→Be− B. N→N− C. O→O2− D. Na→Na− E. Al→Al−…2024 · 6 Apr · Shift 1 · Q5 · MCQ
  39. Match List I with List II Choose the correct answer from the options given below: Includes table2024 · 8 Apr · Shift 1 · Q9 · MCQ
  40. Given below are two statements : Statement (I) : The oxidation state of an element in a particular compound is the charge acquired by its atom on the basis of electron gain enthalpy consideration from other atoms in the molecule. Statement…2024 · 9 Apr · Shift 1 · Q3 · MCQ
  41. Match List I with List II Choose the correct answer from the options given below: Includes table2024 · 9 Apr · Shift 2 · Q11 · MCQ
  42. Match List I with List II Choose the correct answer from the options given below: Includes table2024 · 9 Apr · Shift 2 · Q3 · MCQ
  43. Given below are two statements : Statement (I) : The 4f and 5f - series of elements are placed separately in the Periodic table to preserve the principle of classification. Statement (II) : S-block elements can be…2024 · 27 Jan · Shift 1 · Q10 · MCQ
  44. Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R: Assertion A : The first ionisation enthalpy decreases across a period. Reason R : The increasing…2024 · 29 Jan · Shift 1 · Q2 · MCQ
  45. Given below are two statements : Statement I : The electronegativity of group 14 elements from Si to Pb, gradually decreases. Statement II : Group 14 contains non-metallic, metallic, as well as metalloid elements. In…2024 · 29 Jan · Shift 1 · Q6 · MCQ
  46. Anomalous behavior of oxygen is due to its2024 · 29 Jan · Shift 2 · Q14 · MCQ
  47. Given below are two statements: Statement I : Fluorine has most negative electron gain enthalpy in its group. Statement II : Oxygen has least negative electron gain enthalpy in its group. In the light of the above statements, choose the…2024 · 29 Jan · Shift 2 · Q4 · MCQ
  48. The element having the highest first ionization enthalpy is2024 · 29 Jan · Shift 2 · Q7 · MCQ
  49. Match List I with List II. Choose the correct answer from the options given below : Includes table2024 · 30 Jan · Shift 1 · Q10 · MCQ
  50. If IUPAC name of an element is "Unununnium" then the element belongs to nth group of Periodic table. The value of n is ​.2024 · 30 Jan · Shift 1 · Q30 · Numerical
  51. Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R: Assertion A: H2​Te is more acidic than H2​ S. Reason R: Bond dissociation enthalpy of H2​Te…2024 · 30 Jan · Shift 2 · Q12 · MCQ
  52. Given below are two statements: Statement - I: Along the period, the chemical reactivity of the elements gradually increases from group 1 to group 18 . Statement - II: The nature of oxides formed by group 1 elements is basic while that of…2024 · 30 Jan · Shift 2 · Q20 · MCQ
  53. The correct sequence of electron gain enthalpy of the elements listed below is A. Ar B. Br C. F D. S Choose the most appropriate from the options given below:2024 · 31 Jan · Shift 1 · Q20 · MCQ
  54. Consider the following elements. Which of the following is/are true about A′,B′,C′ and D′ ? A. Order of atomic radii: B′<A′<D′<C′… Includes diagram2024 · 31 Jan · Shift 2 · Q15 · MCQ
  55. The difference between electron gain enthalpies will be maximum between :2023 · 6 Apr · Shift 1 · Q8 · MCQ
  56. Which one of the following elements will remain as liquid inside pure boiling water?2023 · 6 Apr · Shift 2 · Q6 · MCQ
  57. Group-13 elements react with O2​ in amorphous form to form oxides of type M2​O3​ (M= element). Which among the following is the most basic oxide?2023 · 6 Apr · Shift 2 · Q8 · MCQ
  58. The correct order of electronegativity for given elements is:2023 · 8 Apr · Shift 1 · Q3 · MCQ
  59. Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A : The energy required to form Mg2+ from Mg is much higher than that required to…2023 · 10 Apr · Shift 2 · Q4 · MCQ
  60. For elements B,C,N,Li,Be,O and F, the correct order of first ionization enthalpy is2023 · 11 Apr · Shift 1 · Q6 · MCQ
  61. Which of the following statements are not correct? A. The electron gain enthalpy of F is more negative than that of Cl. B. Ionization enthalpy decreases in a group of periodic table. C. The electronegativity of an…2023 · 13 Apr · Shift 1 · Q2 · MCQ
  62. Inert gases have positive electron gain enthalpy. Its correct order is :2023 · 25 Jan · Shift 1 · Q1 · MCQ
  63. Given below are two statements : Statement I : The decrease in first ionization enthalpy from B to Al is much larger than that from Al to Ga. Statement II : The d orbitals in Ga are completely filled. In the light of the above statements,…2023 · 29 Jan · Shift 2 · Q1 · MCQ
  64. Total number of acidic oxides among N2​O3​,NO2​,N2​O,Cl2​O7​,SO2​,CO,CaO,Na2​O and NO is ​.2023 · 29 Jan · Shift 2 · Q21 · Numerical
  65. Match List I with List II Choose the correct answer from the options given below : Includes table2023 · 30 Jan · Shift 1 · Q12 · MCQ
  66. Bond dissociation energy of "E−H" bond of the "H2​E" hydrides of group 16 elements (given below), follows order. A. O B. S C. Se D. Te Choose the correct from the options given…2023 · 30 Jan · Shift 2 · Q11 · MCQ
  67. The correct increasing order of the ionic radii is2023 · 31 Jan · Shift 1 · Q6 · MCQ
  68. Which of the following elements have half-filled f-orbitals in their ground state? (Given : atomic number Sm=62;Eu=63;Tb=65;Gd=64,Pm=61) A. Sm B. Eu C. Tb D. Gd E.…2023 · 31 Jan · Shift 2 · Q5 · MCQ
  69. Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R) Assertion (A): The first ionization enthalpy of 3 d series elements is more than that of group 2 metals Reason (R): In 3d…2023 · 31 Jan · Shift 2 · Q9 · MCQ
  70. Given below are the oxides: Na2​O, As2​O3​, N2​O, NO and Cl2​O7​ Number of amphoteric oxides is :2022 · 24 Jun · Shift 1 · Q5 · MCQ
  71. The IUPAC nomenclature of an element with electronic configuration [Rn] 5f146d17s2 is :2022 · 25 Jul · Shift 1 · Q5 · MCQ
  72. The first ionization enthalpies of Be, B, N and O follow the order2022 · 25 Jul · Shift 2 · Q5 · MCQ
  73. The correct order of electron gain enthalpies of Cl, F, Te and Po is2022 · 25 Jun · Shift 2 · Q5 · MCQ
  74. Given two statements below : Statement I : In Cl2​ molecule the covalent radius is double of the atomic radius of chlorine. Statement II : Radius of anionic species is always greater than their parent atomic radius. Choose the…2022 · 26 Jul · Shift 1 · Q3 · MCQ
  75. The incorrect statement is2022 · 27 Jul · Shift 1 · Q6 · MCQ
  76. Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : The ionic radii of O2− and Mg2+ are same. Reason (R) : Both O2− and Mg2+ are isoelectronic…2022 · 27 Jun · Shift 1 · Q4 · MCQ
  77. The correct order of increasing ionic radii is2022 · 27 Jun · Shift 2 · Q3 · MCQ
  78. In which of the following pairs, electron gain enthalpies of constituent elements are nearly the same or identical? (A) Rb and Cs (B) Na and K (C) Ar and Kr (D) I and At Choose the correct answer from the options given below :2022 · 28 Jul · Shift 1 · Q4 · MCQ
  79. Element "E" belongs to the period 4 and group 16 of the periodic table. The valence shell electron configuration of the element, which is just above "E" in the group is2022 · 28 Jun · Shift 1 · Q1 · MCQ
  80. Match List - I with List - II : Choose the correct answer from the options given below : Includes table2022 · 28 Jun · Shift 2 · Q5 · MCQ
  81. Among the following, basic oxide is :2022 · 28 Jun · Shift 2 · Q6 · MCQ
  82. The first ionization enthalpy of Na, Mg and Si, respectively, are : 496, 737 and 786 kJ mol−1. The first ionization enthalpy (kJmol−1) of Al is :2022 · 29 Jul · Shift 1 · Q3 · MCQ
  83. Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : The first ionization enthalpy for oxygen is lower than that of nitrogen. Reason R : The four electrons in 2p orbitals of…2022 · 29 Jun · Shift 2 · Q4 · MCQ
  84. The correct order of electron gain enthalpy (− ve value) is :2022 · 30 Jun · Shift 1 · Q5 · MCQ
  85. Identify the elements X and Y using the ionisation energy values given below : Includes table2021 · 16 Mar · Shift 2 · Q10 · MCQ
  86. The characteristics of elements X, Y and Z with atomic numbers, respectively, 33, 53 and 83 are :2021 · 16 Mar · Shift 2 · Q5 · MCQ
  87. The absolute value of the electron gain enthalpy of halogens satisfies :2021 · 17 Mar · Shift 1 · Q1 · MCQ
  88. The ionic radius of Na+ ions is 1.02 Ao​. The ionic radii (in Ao​) of Mg2+ and Al3+, respectively, are2021 · 18 Mar · Shift 1 · Q2 · MCQ
  89. The first ionization energy of magnesium is smaller as compared to that of elements X and Y, but higher than that of Z. The elements X, Y and Z, respectively, are :2021 · 18 Mar · Shift 2 · Q8 · MCQ
  90. Which one of the following statements for D.I. Mendeleeff, is incorrect?2021 · 22 Jul · Shift 2 · Q1 · MCQ
  91. Number of amphoteric compounds among the following is ​. (A) BeO (B) BaO (C) Be(OH)2​ (D) Sr(OH)2​2021 · 24 Feb · Shift 1 · Q14 · Numerical
  92. Consider the elements Mg, Al, S, P and Si, the correct increasing order of their first ionization enthalpy is :2021 · 24 Feb · Shift 1 · Q4 · MCQ
  93. The correct order of bond dissociation enthalpy of halogens is :2021 · 25 Feb · Shift 2 · Q14 · MCQ
  94. The ionic radii of K+, Na+, Al3+ and Mg2+ are in the order:2021 · 25 Jul · Shift 1 · Q9 · MCQ
  95. The ionic radii of F− and O2− respectively are 1.33 Ao​ and 1.4 Ao​, while the covalent radius of N is 0.74 Ao​. The correct statement for the ionic radius of N3− from the…2021 · 25 Jul · Shift 2 · Q3 · MCQ
  96. Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Barium carbonate is insoluble in water and is highly stable. Reason (R) : The thermal stability of the carbonates…2021 · 26 Aug · Shift 2 · Q5 · MCQ
  97. Match List - I with List - II. Choose the most appropriate answer from the options given below : Includes table2021 · 26 Feb · Shift 1 · Q4 · MCQ
  98. The correct order of electron gain enthalpy is :2021 · 26 Feb · Shift 2 · Q14 · MCQ
  99. Which pair of oxides is acidic in nature?2021 · 26 Feb · Shift 2 · Q7 · MCQ
  100. The correct order of ionic radii for the ions, P3−, S2−, Ca2+, K+, Cl − is :2021 · 27 Aug · Shift 2 · Q5 · MCQ
  101. Match List - I with List - II : Choose the most appropriate answer from the options given below Includes table2021 · 27 Jul · Shift 1 · Q12 · MCQ
  102. The correct order of first ionisation enthalpy is :2021 · 27 Jul · Shift 2 · Q3 · MCQ
  103. Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Metallic character decreases and non-metallic character increases on moving from left to right in a period. Reason…2021 · 31 Aug · Shift 1 · Q9 · MCQ
  104. Match List - I with List - II : Choose the most appropriate answer from the options given below : Includes table2021 · 31 Aug · Shift 2 · Q11 · MCQ
  105. In general the property (magnitudes only) that show an opposite trend in comparison to other properties across a period is2020 · 2 Sep · Shift 1 · Q7 · MCQ
  106. Three elements X, Y and Z are in the 3rd period of the periodic table. The oxides of X, Y and Z, respectively, are basic, amphoteric and acidic. The correct order of the atomic numbers of X, Y and Z is :2020 · 2 Sep · Shift 2 · Q20 · MCQ
  107. The atomic number of the element unnilennium is :2020 · 3 Sep · Shift 1 · Q6 · MCQ
  108. The five successive ionization enthalpies of an element are 800, 2427, 3658, 25024 and 32824 kJ mol–1. The number of valence electrons in the element is :2020 · 3 Sep · Shift 2 · Q13 · MCQ
  109. Among the statements (I – IV), the correct ones are: (I) Be has smaller atomic radius compared to Mg. (II) Be has higher ionization enthalpy than Al. (III) Charge/radius ratio of Be is greater than that of Al. (IV) Both Be and Al form…2020 · 3 Sep · Shift 2 · Q15 · MCQ
  110. The ionic radii of O2−, F−, Na+ and Mg2+ are in the order :2020 · 4 Sep · Shift 1 · Q17 · MCQ
  111. The correct order of the ionic radii of O2−, N3−, F− , Mg2+, Na+ and Al3+ is :2020 · 5 Sep · Shift 2 · Q7 · MCQ
  112. The atomic number of Unnilunium is ​.2020 · 6 Sep · Shift 2 · Q8 · Numerical
  113. The electron gain enthalpy (in KJ/mol) of fluorine, chlorine, bromine and iodine, respectively are:2020 · 7 Jan · Shift 1 · Q15 · MCQ
  114. Within each pair of elements F & Cl, S & Se, and Li & Na, respectively, the elements that release more energy upon and electron gain are :2020 · 7 Jan · Shift 2 · Q5 · MCQ
  115. The third ionization enthalpy is minimum for :2020 · 8 Jan · Shift 1 · Q1 · MCQ
  116. The first ionization energy (in kJ/mol) of Na, Mg, Al and Si respectively, are :2020 · 8 Jan · Shift 1 · Q12 · MCQ
  117. The increasing order of the atomic radii of the following elements is :- (a) C (b) O (c) F (d) Cl (e) Br2020 · 8 Jan · Shift 2 · Q2 · MCQ
  118. The acidic, basic and amphoteric oxides, respectively, are :2020 · 9 Jan · Shift 1 · Q21 · MCQ
  119. B has a smaller first ionization enthalpy than Be. Consider the following statements : (I) It is easier to remove 2p electron than 2s electron (II) 2p electron of B is more shielded from the nucleus by the inner core of electrons than the…2020 · 9 Jan · Shift 1 · Q22 · MCQ
  120. The electronic configurations of bivalent europium and trivalent cerium are (atomic number : Xe = 54, Ce = 58, Eu = 63)2020 · 9 Jan · Shift 1 · Q9 · MCQ
  121. The first and second ionisation enthalpies of a metal are 496 and 4560 kJ mol–1, respectively. How many moles of HCl and H2​SO4​, respectively, will be needed to react completely with 1 mole of the metal hydroxide ?2020 · 9 Jan · Shift 2 · Q3 · MCQ
  122. The lathanide ion that would show colour is :2019 · 8 Apr · Shift 1 · Q14 · MCQ
  123. The size of the iso-electronic species Cl−, Ar and Ca2+ is affected by :2019 · 8 Apr · Shift 1 · Q6 · MCQ
  124. The IUPAC symbol for the element with atomic number 119 would be :2019 · 8 Apr · Shift 2 · Q18 · MCQ
  125. The element having greatest difference between its first and second ionization energies, is :2019 · 9 Apr · Shift 1 · Q20 · MCQ
  126. Aluminium is usually found in +3 oxidation state. In contrast, thallium exists in + 1 and + 3 oxidation states. This is due to :2019 · 9 Jan · Shift 1 · Q19 · MCQ
  127. In general, the properties that decrease and increase down a group in the periodic table, respectively, are :2019 · 9 Jan · Shift 1 · Q20 · MCQ
  128. When the first electron gain enthalpy (Δeg​H) of oxygen is − 141 kJ/mol, its second electron gain enthalpy is :2019 · 9 Jan · Shift 2 · Q14 · MCQ
  129. The electronegativity of aluminium is similar to :2019 · 10 Jan · Shift 1 · Q21 · MCQ
  130. The correct order of the atomic radii of C, Cs, Al, and S is :2019 · 11 Jan · Shift 1 · Q4 · MCQ
  131. The correct option with respect to the Pauling electronegativity values of the element is :2019 · 11 Jan · Shift 2 · Q20 · MCQ
  132. Among the following, the energy of 2s orbital is lowest in :2019 · 12 Apr · Shift 2 · Q17 · MCQ
  133. In comparison to boron, berylium has :2019 · 12 Apr · Shift 2 · Q6 · MCQ
  134. The element with Z = 120 (not yet discovered) will be an/a -2019 · 12 Jan · Shift 1 · Q11 · MCQ
  135. For Na+, Mg2+, F− and O2−; the correct order of increasing ionic radii is :2018 · 15 Apr · Shift 1 · Q17 · MCQ
  136. The correct order of electron affinity is :2018 · 15 Apr · Shift 2 · Q16 · MCQ
  137. Consider the following ionization enthalpies of two elements 'A' and 'B' . Which of the following statements is correct ? Includes table2017 · 8 Apr · Shift 1 · Q11 · MCQ
  138. Which one of the following is an oxide?2017 · 9 Apr · Shift 1 · Q14 · MCQ
  139. The electronic configuration with the highest ionization enthalpy is :2017 · 9 Apr · Shift 1 · Q16 · MCQ
  140. The following statements concern elements in the periodic table. Which of the following is true ?2016 · 10 Apr · Shift 1 · Q13 · MCQ
  141. The ionic radii (in Å) of N3−​, O2− and F− are respectively:2015 · Shift 0 · Q21 · MCQ
  142. The first ionization potential of Na is 5.1 eV. The value of electron gain enthalpy of Na+ will be:2013 · Shift 0 · Q21 · MCQ
  143. Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar?2013 · Shift 0 · Q22 · MCQ
  144. The increasing order of the ionic radii of the given isoelectronic species is :2012 · Shift 0 · Q21 · MCQ
  145. Outer electronic configuration of Gd (Atomic no : 64) is -2011 · Shift 0 · Q10 · MCQ
  146. Which one of the following order represents the correct sequence of the increasing basic nature of the given oxides ?2011 · Shift 0 · Q27 · MCQ
  147. The correct sequence which shows decreasing order of the ionic radii of the elements is2010 · Shift 0 · Q24 · MCQ
  148. The set representing the correct order of ionic radius is :2009 · Shift 0 · Q10 · MCQ
  149. In which of the following arrangements, the sequence is not strictly according to the property written against it2009 · Shift 0 · Q23 · MCQ
  150. The increasing order of the first ionization enthalpies of the elements B, P, S and F (lowest first) is :2006 · Shift 0 · Q37 · MCQ
  151. Following statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements gives the correct picture?2006 · Shift 0 · Q48 · MCQ
  152. Which of the following oxides is amphoteric in character?2005 · Shift 0 · Q57 · MCQ
  153. In which of the following arrangements the order is NOT according to the property indicated against it?2005 · Shift 0 · Q58 · MCQ
  154. Which one of the following ions has the highest value of ionic radius?2004 · Shift 0 · Q59 · MCQ
  155. Among Al2​O3​, SiO2​, P2​O3​ and SO2​ the correct order of acid strength is2004 · Shift 0 · Q60 · MCQ
  156. The formation of the oxide ion O2−(g) requires first an exothermic and then an endothermic step as shown below O(g) + e− = O(g)−​Δ Ho = -142 kJmol-1 O(g)−​+ e− =O(g)2−​Δ Ho = 844 kJmol-1 This…2004 · Shift 0 · Q61 · MCQ
  157. The reduction in atomic size with increase in atomic number is a characteristic of elements of2003 · Shift 0 · Q24 · MCQ
  158. The atomic numbers of Vanadium (V), Chromium (cr), Manganese (Mn) and Iron (Fe), respectively, 23,24,25 and 26. Which one of these may be expected to have the higher second ionization enthalpy?2003 · Shift 0 · Q25 · MCQ
  159. According to the Periodic Law of elements, the variation in properties of elements is related to their2003 · Shift 0 · Q60 · MCQ
  160. Which one of the following is an amphoteric oxide?2003 · Shift 0 · Q61 · MCQ
  161. The correct order of ionic radius is2002 · Shift 0 · Q26 · MCQ
  162. Ce+3,La+3,Pm+3 and Yb+3 have ionic radial in the increasing order as2002 · Shift 0 · Q27 · MCQ