Hydrogen PYQs Set 2 (PDF)

Set 2 of 5 · Questions 31-60 of 140

In the print window choose “Save as PDF”. The file prints without a web address or date line.

Mere Teacher · Previous Year Questions JEE Main Chemistry · Hydrogen · Set 2 (Q31-60)
Scan or visit mereteacher.com for free PYQ practice, timed CBT tests, step-by-step solutions and BroBot AI. Answers and solutions are free with a sign-up.
31. $The hydrides of which group elements of the periodic table form electron precise hydrides?$ (1) $group 12$ (2) $group 13$ (3) $group 14$ (4) $group 16$ 32. $What are X and Y respectively in the following reactions X + D_{2} O \to C_{2} D_{2} + P Y + D_{2} O \to CD_{4} + Q$ (1) $AlCl_{3}, CaCl_{2}$ (2) $Be_{2} C, Al_{4} C_{3}$ (3) $Al_{4} C_{3}, CaC_{2}$ (4) $CaC_{2}, Al_{4} C_{3}$ 33. $Among the following the correct statements are I. LiH, BeH_{2} and MgH_{2} are saline hydrides with significant covalent character II. Saline hydrides are volatile III. Electron - precise hydrides are Lewis bases IV. The formula for chromium hydride is CrH The correct option is$ (1) $I, III only$ (2) $II, IV only$ (3) $I, IV only$ (4) $III, IV only$ 34. $The metal salts formed during softening of hardwater using Clark's method are :$ (1) $Ca (O H)_{2} and Mg (O H)_{2}$ (2) $C a C O_{3} and Mg (O H)_{2}$ (3) $Ca (O H)_{2} and M g C O_{3}$ (4) $C a C O_{3} an d M g C O_{3}$ 35. $What is the approximate volume (in mL) of 10 vol H_{2} O_{2} solution that will react completely with 1 L of 0.02 M KMnO_{4} solution in acidic medium?$ (1) $56.05$ (2) $113.5$ (3) $90.8$ (4) $75.75$ 36. $Which one of the following methods is most suitable for preparing deionized water?$ (1) $Synthetic resin method$ (2) $Clark's method$ (3) $Calgon's method$ (4) $Permutit method$ 37. $When zeolite, which is hydrated sodium aluminium silicate is treated with hard water, the sodium ions are exchanged with$ (1) $H^{+} ions$ (2) $C a^{2 +} ions$ (3) $SO_{4}^{2-} ions$ (4) $O H^{-}$ 38. $The number of hydrogen bonds formed by a water molecule at normal conditions is$ (1) $1$ (2) $2$ (3) $3$ (4) $4$ 39. $The number of water molecules (s) not coordinated to copper ion directly in CuSO_{4} \cdot 5 H_{2} O is:$ (1) $2$ (2) $3$ (3) $1$ (4) $4$ 40. $The hardness of a water sample (in terms of equivalents of (CaCO_{3}) containing 10^{- 3} M CaSO_{4} is: (molar mass of (CaSO_{4} = 136 g mol^{- 1})$ (1) $10 ppm$ (2) $50 ppm$ (3) $90 ppm$ (4) $100 ppm$ 41. $Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Hydrogen is the most abundant element in the Universe, but it is not the most abundant gas inthe troposphere. Reason R: Hydrogen is the lightest element. In the light of the above statements, choose the correct answer from the given below:$ (1) $A is false but R is true$ (2) $Both A and R are true and is the correct explanation of A.$ (3) $A is true but R is false.$ (4) $Both A and R are true but is NOT the correct explanation of A.$ 42. $A compound (MO_{2}) of group I element (M) hydrolysed to form M^{+}, OH^{-}, X and Y . When X reacts with I_{2} in basic medium the products formed are I^{-}, water and Y . Then X and Y are respectively$ (1) $H_{2} O_{2}, O_{2}$ (2) $H_{2} O_{2}, O_{3}$ (3) $H_{2}, O_{2}$ (4) $O_{2}, H_{2}$ 43. $The number of water molecules present in borax, kernite and bauxite respectively are$ (1) $10, 4, 2$ (2) $5, 1, 2$ (3) $4, 2, 3$ (4) $10, 4, 10$ 44. $The maximum number of hydrogen bonds that a molecule of water can have is$ (1) $3$ (2) $4$ (3) $1$ (4) $2$ 45. $Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: Hydrogen is an environment friendly fuel Reason R: Atomic number of hydrogen is 1 and it is a very light element. In the light of the above statements, choose the correct answer from the options given below$ (1) $A is true but R is false$ (2) $Both A and R are true but R is NOT the correct explanation of A$ (3) $A is false but R is true$ (4) $Both A and R are true and R is the correct explanation of A$ 46. $The correct statements among the following are(A) BeH2 and MgH2 are polymeric in nature(B) LiH is unreactive to oxygen, at moderate temperatures(C) BeH2 and MgH2 possesses significant covalent character(D) the stability of alkali hydrides follows the order LiH < NaH < KH < RbH < CsH$ (1) $A, B, C, D$ (2) $A, C only$ (3) $A, C, D only$ (4) $A, B, C only$ 47. $The number of hydrogen molecules possible from its isotopes is$ (1) $3$ (2) $6$ (3) $1$ (4) $4$ 48. $Which of the following forms of hydrogen emits low energy β^{-} particles?$ (1) $Proton H^{+}$ (2) $Deuterium 12 H$ (3) $Protium 11 H$ (4) $Tritium 13 H$ 49. $Hydrogen peroxide is stored away from light because it can get decomposed when exposed to light as$ (1) $H_{2} O and O_{2}$ (2) $H_{2} and O_{2}$ (3) $H_{2} O and H_{2}$ (4) $H_{2} O and O_{3}$ 50. $Polyphosphates are used as water softening agents because they$ (1) $form soluble complexes with anionic species.$ (2) $precipitate anionic species.$ (3) $form soluble complexes with cationic species.$ (4) $precipitate cationic species.$ 51. $In which of the following substances will hydrogen bonds be strongest?$ (1) $HCl$ (2) $H_{2} O$ (3) $Hl$ (4) $H_{2} S$ 52. $Consider the following statements about the hydrides (I) Sodium hydride with water liberates oxygen gas (II) Methane, silane are examples of electron precise hydrides (III)Ammonia and water molecules are examples of electron deficient hydrides (IV)Hydrides of beryllium and magnesium are polymeric in structure The correct statements are$ (1) $I & II only$ (2) $III & IV only$ (3) $II & IV only$ (4) $I & IV only$ 53. $Given below are two statements : Statement -I: The process of producing syn-gas is called gasification of coal. Statement -II: The composition of syn-gas is CO + C O_{2} + H_{2} (1 : 1 : 1) In the light of the above statements, choose the most appropriate answer from the options given below :$ (1) $Statement -I is false but Statement -II is true$ (2) $Statement -I is true but Statement -II is false$ (3) $Both Statement -I and Statement -II are false$ (4) $Both Statement -I and Statement -II are true$ 54. $Given below are two statements: Statement I : Nickel is being used as the catalyst for producing syn gas and edible fats. Statement II : Silicon forms both electron rich and electron deficient hydrides. In the light of the above statements, choose the most appropriate answer from the options given below;$ (1) $Both the statements I and II are correct$ (2) $Statement I is incorrect but statement II is correct$ (3) $Both the statements I and II are incorrect$ (4) $Statement I is correct but statement II is incorrect$ 55. $Which one of the following reactions indicates the reducing ability of hydrogen peroxide in basic medium ?$ (1) $HOC1 + H_{2} O_{2} \to H_{3} O^{+} + C l^{-} + O_{2}$ (2) $PbS + 4 H_{2} O_{2} \to P b S O_{4} + 4 H_{2} O$ (3) $2 M n O_{4}^{-} + 3 H_{2} O_{2} \to 2 M n O_{2} + 3 O_{2} + 2 H_{2} O + 2 O H^{-}$ (4) $M n^{2 +} + H_{2} O_{2} \to M n^{4 +} + 2 O H^{-}$ 56. $Among the following, the correctly matched pair is$ (1) $electron deficient hydride - SiH_{4}$ (2) $saline hydride - CrH$ (3) $electron precise hydride - HF$ (4) $electron rich hydride - NH_{3}$ 57. $What is the volume (in mL) of 20 vol H_{2} O_{2} required to completely react with 500 mL of 0.02 M acidified KMnO_{4} solution?$ (1) $14.0$ (2) $7.0$ (3) $28.0$ (4) $42.0$ 58. $What will be the organic compound formed, when aluminium carbide react with deuterated water?$ (1) $CD_{3} OD$ (2) $DCOOD$ (3) $CD_{4}$ (4) $D_{3} C - O - CD_{3}$ 59. $Dihydrogen of high purity (>99.95%) is obtained through$ (1) $the electrolysis of acidified water using Pt electrodes.$ (2) $the electrolysis of warm Ba (OH)_{2} solution using Ni electrodes.$ (3) $the electrolysis of brine solution.$ (4) $the reaction of Zn with dilute HCl.$ 60. $The volume strength of 8.9 M H_{2} O_{2} solution calculated at 273 K and 1 atm is (R = 0.0821 L atm K^{- 1} mol^{- 1}) (rounded off to the nearest integer)$