Hydrogen PYQs Set 5 (PDF)

Set 5 of 5 · Questions 121-140 of 140

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Hydrogen · Set 5 (Q121-140)
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121. $Hydrogen has three isotopes : protium (^{1} H), deuterium (^{2} H or D) and tritium (^{3} H or T). They have nearly same chemical properties but different physical properties. They differ in$ (1) $number of protons$ (2) $atomic number$ (3) $electronic configuration$ (4) $atomic mass$ 122. $The composition of water gas is$ (1) $CO_{(g)} + N_{2_{(g)}}$ (2) $CO_{(g)} + H_{2} O_{(g)}$ (3) $CH_{4}$ (4) $CO_{(g)} + H_{2 (g)}$ 123. $The structure of H_{2} O_{2} is$ (1) $spherical$ (2) $non‐planar$ (3) $planar$ (4) $linear. (2003)$ 124. $NaH is an example of :$ (1) $Electron-rich hydride$ (2) $Saline hydride$ (3) $Molecular hydride$ (4) $Metallic hydride$ 125. $The isotopes of hydrogen are:$ (1) $Tritium and protium only$ (2) $Protium and deuterium only$ (3) $Protium, deuterium and tritium$ (4) $Deuterium and tritium only$ 126. $In comparison to the zeolite process for the removal of permanent hardness, the synthesis resins method is:$ (1) $more efficient as it can exchange both cations as well as anions.$ (2) $less efficient as it exchanges only anions$ (3) $more efficient as it can exchange only cations.$ (4) $less efficient as the resins cannot be regenerated.$ 127. $Statement about heavy water are given below A. Heavy water is used in exchange reactions for the study of reaction mechanisms B. Heavy water is prepared by exhaustive electrolysis of water C. Heavy water has higher boiling point than ordinary water D. Viscosity of H_{2} O is greater than D_{2} O$ (1) $A and B only$ (2) $A and D only$ (3) $A, B and C only$ (4) $A and C only$ 128. $Which of the following is not true tegarding the usage of hydrogen as a fuel?$ (1) $High calorific value$ (2) $The combustible energy of hydrogen can be directly converted to electrical energy in a fuel cell.$ (3) $Combustion product is eco-friendly.$ (4) $Hydrogen gas can be easily liquefied and stored.$ 129. $Which of the following hydrides is electron deficient?$ (1) $CH_{4}$ (2) $B_{2} H_{6}$ (3) $NaH$ (4) $CaH_{2}$ 130. $Which of the following statements are correct? (I)On decomposition of H_{2} O_{2}, O_{2} gas is released. (II)2-ethylanthraquinol is used in preparation of H_{2} O_{2} . (III)On heating KCl O_{3}, Pb (N O_{3})_{2}, NaN O_{3}, O_{2} gas is released. (IV)In the preparation of sodium peroxoborate, H_{2} O_{2} is treated with sodium metaborate.$ (1) $I, II, IV$ (2) $II, III, IV$ (3) $I, II, III, IV$ (4) $I, II, III$ 131. $The reagent commonly used to determine hardness of water titrimetrically is$ (1) $oxalic acid$ (2) $disodium salt of EDTA$ (3) $sodium citrate$ (4) $sodium thiosulphate$ 132. $In the manufacture of hydrogen from water gas (CO + H_{2}), which of the following is correct statement?$ (1) $CO is oxidized to CO_{2} with steam in the presence of a catalyst followed by absorption of CO_{2} in alkali.$ (2) $H_{2} is removed by occlusion with Pd .$ (3) $Hydrogen is isolated by diffusion.$ (4) $CO and H_{2} are separated based on difference in their densities.$ 133. $Which one of the following processes will produce permanent hard water ?$ (1) $Addition of N a_{2} S O_{4} to water.$ (2) $Saturation of water with C a C O_{3}$ (3) $Saturation of water with M g C O_{3}$ (4) $Saturation of water with C a S O_{4}$ 134. $Boiling of hard water is helpful in removing the temporary hardness by converting calcium hydrogen carbonate and magnesium hydrogen carbonate to$ (1) $C a C O_{3} andMg (O H)_{2}$ (2) $C a C O_{3} an d M_{2} C O_{3}$ (3) $Ca (O H)_{2} and M g C O_{3}$ (4) $Ca (O H)_{2} and Mg (O H)_{2}$ 135. $H_{2} O_{2} acts as a reducing agent in$ (1) $2NaOCl + H_{2} O_{2} \to 2NaCl + H_{2} O + O_{2}$ (2) $2 F e^{2 +} + 2 H^{+} + H_{2} O_{2} \to 2 F e^{3 +} + 2 H_{2} O$ (3) $M n^{2 +} + 2 H_{2} O_{2} \to M n O_{2} + 2 H_{2} O$ (4) $N a_{2} S + 4 H_{2} O_{2} \to N a_{2} S O_{4} + 4 H_{2} O$ 136. $In which of the following reactions the hydrogen peroxide acts as a reducing agent?$ (1) $PbS + 4 H_{2} O_{2} \to P b S O_{4} + 4 H_{2} O$ (2) $2 F e^{2 +} + H_{2} O_{2} \to 2 F e^{3 +} + 2 O H^{-}$ (3) $HOCl+ H_{2} O_{2} \to H_{3} O^{+} + C l^{-} + O_{2}$ (4) $M n^{2 +} + H_{2} O_{2} \to M n^{4 +} + 2 O H^{-}$ 137. $The isotopes of hydrogen are :$ (1) $Deuterium and tritium only$ (2) $Protium and deuterium only$ (3) $Protium, deuterium and tritium$ (4) $Tritium and Protium only$ 138. $Hydrogen peroxide, in the pure state is$ (1) $linear and blue in color$ (2) $planar and blue in color$ (3) $linear and almost colorless$ (4) $non-planar and almost colorless$ 139. $4, Water gas is producedby$ (1) $passing steam through a red hot coke$ (2) $saturating hydrogen with moisture$ (3) $mixing oxygen and hydrogen in the ratio of 1 : 2$ (4) $heating a mixture of C O_{2} and C H_{4} in petroleum refineries. (1992)$ 140. $The number of hydrogen bonded water molecule(s) associated with stoichiometry C u S O_{4} \cdot 5 H_{2} O is ____.$