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Some Basic Concepts of Chemistry

52 questions · Chemistry · NEET
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Some Basic Concepts of Chemistry

52 questions · Chemistry · NEET

  1. Among the following, choose the ones with equal number of atoms. A. 212 g of Na2​CO3​( s) [molar mass =106 g ] B. 248 g of Na2​O(s) [molar mass =62 g ] C.…2025 · Q116 · MCQ
  2. Dalton's Atomic theory could not explain which of the following?2025 · Q121 · MCQ
  3. 1 gram of sodium hydroxide was treated with 25 mL of 0.75 M HCl solution, the mass of sodium hydroxide left unreacted is equal to2024 · Q108 · MCQ
  4. The highest number of helium atoms is in2024 · Q123 · MCQ
  5. A compound X contains 32% of A, 20% of B and remaining percentage of C. Then, the empirical formula of X is : (Given atomic masses of A=64 ; B=40 ; C=32 u)2024 · Q150 · MCQ
  6. The amount of glucose required to prepare 250 mL of 20M​ aqueous solution is : (Molar mass of glucose : 180 g mol−1)2024 · Q120 · MCQ
  7. 1.0 g of H2​ has same number of molecules as in:2024 · Q130 · MCQ
  8. On complete combustion, 0.3 g of an organic compound gave 0.2 g of CO2​ and 0.1 g of H2​O. The percentage composition of carbon and hydrogen in the compound, respectively is:2024 · Q143 · MCQ
  9. The density of 1 M solution of a compound 'X' is 1.25 g mL−1. The correct option for the molality of solution is (Molar mass of compound X = 85 g):2023 · Q91 · MCQ
  10. The right option for the mass of CO2​ produced by heating 20 g of 20% pure limestone is (Atomic mass of Ca=40 ) [CaCO3​⟶1200 K​CaO+CO2​]…2023 · Q106 · MCQ
  11. What fraction of Fe exists as Fe(III) in Fe0.96O ? (Consider Fe0.96O to be made up of Fe(II) and Fe(III) only)2022 · Q135 · MCQ
  12. The density of the solution is 2.15 g mL−1, then mass of 2.5 mL solution in correct significant figures is :2022 · Q97 · MCQ
  13. In one molal solution that contains 0.5 mole of a solute, there is2022 · Q109 · MCQ
  14. What mass of 95% pure CaCO3 will be required to neutralise 50 mL of 0.5 M HCl solution according to the following reaction? CaCO3(s) + 2HCl(aq) → CaCl2(aq) + Co2(g) + 2H2O(l) [Calculate upto second place of decimal point]2022 · Q112 · MCQ
  15. An organic compound contains 78% (by wt.) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is : [Atomic wt. of C is 12, H is 1]2021 · Q106 · MCQ
  16. Which one of the following has maximum number of atoms?2020 · Q82 · MCQ
  17. The number of protons, neutrons and electrons in 17571Lu, respectively, are :2020 · Q97 · MCQ
  18. The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber’s process is :2019 · Q98 · MCQ
  19. A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. H2SO4 . The evolved gaseous mixture is passed through KOH pellets. Weight (in g) of the remaining product at STP will be2018 · Q115 · MCQ
  20. In which case is number of molecules of water maximum?2018 · Q99 · MCQ
  21. Which of the following is dependent on temperature?2017 · Q89 · MCQ
  22. Suppose the elements X and Y combine to form two compounds XY2 and X3Y2. When 0.1 mole of XY2 weights 10 g and 0.05 mole of X3Y2 weighs 9 g, the atomic weights of X and Y are2016 · Q79 · MCQ
  23. What is the mole fraction of the solute in a 1.00 m aqueous solution?2015 · Q82 · MCQ
  24. What is the mass of the precipitate formed when 50 mL of 16.9% solution of AgNO3 is mixed with 50 mL of 5.8% NaCl solution ? (Ag = 107.8, N = 14, O = 16, Na = 23, Cl = 35.52015 · Q91 · MCQ
  25. If Avogadro number NA, is changed from 6.022 × 1023 mol−1 to 6.022 × 1020 mol−1, this would change2015 · Q92 · MCQ
  26. The number of water molecules is maximum in2015 · Q93 · MCQ
  27. A mixture of gases contains H2 and O2 gases in the ratio of 1 : 4 (w/w). What is the molar ratio of the two gases in the mixture ?2015 · Q76 · MCQ
  28. Equal masses of H2, O2 and methane have been taken in a container of volume V at temperature 27oC in identical conditions. The ratio of the volumes of gases H2 : O2 : methane would be2014 · Q100 · MCQ
  29. 1.0 g of magnesium is burnt with 0.56 g O2 in a closed vessel, Which reactant is left in excess and how much ? (At. wt. Mg = 24, O = 16)2014 · Q101 · MCQ
  30. When 22.4 liters of H2(g) is mixed with 11.2 litres of Cl2(g), each at S.T.P. the moles of HCl(g) formed is equal to2014 · Q99 · MCQ
  31. In an experiment it showed that 10 mL of 0.05 M solution of chloride required 10 mL of 0.1 M solution of AgNO3, which of the following will be the formula of the chloriode (X stands for the symbol of the element other than chlorine)2013 · Q83 · MCQ
  32. 6.02 × 1020 molecules of urea present in 100 mL of its solution. The concentration of solution is2013 · Q84 · MCQ
  33. How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M HNO3? The concentrated acid is 70% HNO3.2013 · Q86 · MCQ
  34. Which has the maximum number of molecules among the following ?2011 · Q57 · MCQ
  35. The number of atoms in 0.1 mol of a triatomic gas is (NA = 6.02 × 1023 mol−1)2010 · Q117 · MCQ
  36. 25.3 g of sodium carbonate, Na2CO3 is dissolved in enough water to make 250 mL of solution. If sodium carbonate dissociates completely, molar concentration of sodium ion, Na+ and carbonate ions, CO32−​ are respectively (Molar mass…2010 · Q118 · MCQ
  37. 10 g of hydrogen and 64 g of oxygen were filled in a steel vessel and exploded. Amount of water produced in this reaction will be2009 · Q88 · MCQ
  38. An organic compound contains carbon, hydrogen and oxygen. Its elemental analysis gave C, 38.71% and H, 9.67%. The empirical formula of the compound would be2008 · Q105 · MCQ
  39. What volume of oxygen gas (O2) measuread at 0oC and 1 atm, is needed to burn completely 1 L of propane gas (C3H8) measured under the same conditions ?2008 · Q106 · MCQ
  40. How many moles of lead (II) chloride will be formed from a reaction between 6.5 g of PbO and 3.2 g HCl ?2008 · Q87 · MCQ
  41. Concentrated aqueous sulphuric acid is 98% H2SO4 by mass and has a density of 1.80 g mL−1. Volume of acid required to make one litre of 0.1 M H2SO4 solution is2007 · Q84 · MCQ
  42. An element, X has the following isotopic composition: 200X : 90% 199X : 8.0% 202X : 2.0% The weighted average atomic mass of the naturally occuring element X is closest to2007 · Q92 · MCQ
  43. The mole fraction of the solute in one molal aqueous solution is2005 · Q88 · MCQ
  44. The maximum number of molecules is present in2004 · Q99 · MCQ
  45. The percentage of C, H and N in an organic compound are 40%, 13.3% and 46.7% respectively then empirical formula is2002 · Q121 · MCQ
  46. Which has maximum molecules?2002 · Q87 · MCQ
  47. 2.5 litre of 1 M NaOH solution is mixed with another 3 litre of 0.5 M NaOH solution. Then find out molarity of resultant solution.2002 · Q97 · MCQ
  48. Molarity of liquid HCl, if density of solution is 1.17 g/ce is2001 · Q106 · MCQ
  49. Percentage of Se in peroxidase anhydrous enzyme is 0.5% by weight (at. wt. = 78.4) then minimum molecular weight of peroxide anhydrous enzyme is2001 · Q107 · MCQ
  50. Specific volume of cylinfrical virus particle is 6.02 × 10−2 cc/g whose radius and length are 7 A∘​ and 10 A∘​ respectively. If NA = 6.02 × 1023, find molecular weight…2001 · Q108 · MCQ
  51. Volume of CO2 obtained by the complete decomposition of 9.85 g of BaCO3 is2000 · Q104 · MCQ
  52. Oxidation numbers of A, B, C are + 2, +5 and −2 respectively. Possible formula of compound is2000 · Q105 · MCQ