Hydrogen PYQs Set 1 (PDF)

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Mere Teacher · Previous Year Questions NEET Chemistry · Hydrogen · Set 1 (Q1-30)
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1. $Deionized water is obtained by passing hard water through$ (1) $Zeolite$ (2) $Cationic exchanger only$ (3) $Anionic exchanger only$ (4) $Both cationic and anionic exchanger one after the other$ 2. $Given below are two statements : Statement I: H_{2} O_{2} is used in the synthesis of Cephalosporin Statement II : H_{2} O_{2} is used for the restoration of aerobic conditions to sewage wastes. In the light of the above statements, choose the most appropriate answer from the options given below:$ (1) $Both Statement I and Statement II are correct$ (2) $Statement I is incorrect but Statement II is correct$ (3) $Statement I is correct but Statement II is incorrect$ (4) $Both Statement I and Statement II are incorrect$ 3. $The total number of isotopes of hydrogen and number of radioactive isotopes among them, respectively, are:$ (1) $3 and 1$ (2) $3 and 2$ (3) $2 and 1$ (4) $2 and 0$ 4. $Which one of the following statements is incorrect ?$ (1) $Atomic hydrogen is produced when H_{2} molecules at a high temperature are irradiated with UV radiation.$ (2) $At around 2000 K, the dissociation of dihydrogen into its atoms is nearly 8.1%.$ (3) $Bond dissociation enthalpy of H_{2} is highest among diatomic gaseous molecules which contain a singlebond.$ (4) $Dihydrogen is produced on reacting zinc with HCl as well as N a O H_{(a q)} .$ 5. $Given below are two statements: Statement I : Hydrogen peroxide can act as an oxidizing agent in both acidic and basic conditions. Statement II: Density of hydrogen peroxide at 298 K is lower than that of D_{2} O. In the light of the above statements. Choose the correct answer from the options.$ (1) $Both statement I and Statement II are true$ (2) $Both statement I and Statement II are false$ (3) $Statement I is true but Statement II is false$ (4) $Statement I is false but Statement II is true$ 6. $What is the change in the oxidation state of Mn in the reaction of MnO_{4}^{--} with H_{2} O_{2} in acidic medium?$ (1) $7 \to 4$ (2) $6 \to 4$ (3) $7 \to 2$ (4) $6 \to 2$ 7. $High purity (>99.95%) dihydrogen is obtained by$ (1) $reaction of zinc with aqueous alkali.$ (2) $electrolysis of acidified water using platinum electrodes.$ (3) $electrolysis of warm aqueous barium hydroxide solution between nickel electrodes.$ (4) $reaction of zinc with dilute acid.$ 8. $O-O bond length in H_{2} O_{2} is X than the O-O bond length in F_{2} O_{2} . The O - H bond length in H_{2} O_{2} is Y than that of the O-F bond in F_{2} O_{2} . Choose the correct option for X and Y from the given below.$ (1) $X - shorter, Y - shorter$ (2) $X - shorter, Y - longer$ (3) $X - longer, Y - longer$ (4) $X - longer, Y - shorter$ 9. $The compound used as a moderator in nuclear reactors is$ (1) $BeD_{2}$ (2) $D_{2} O_{2}$ (3) $D_{2} O$ (4) $NaD$ 10. $The temporary hardness of a water sample is due to compound X . Boiling this sample converts X to compound Y . X and Y, respectively, are:$ (1) $Mg (HCO_{3})_{2} and Mg (OH)_{2}$ (2) $Ca (HCO_{3})_{2} and Ca (OH)_{2}$ (3) $Mg (HCO_{3})_{2} and MgCO_{3}$ (4) $Ca (HCO_{3})_{2} and CaO$ 11. $Which of the following ions will cause hardness in water?$ (1) $Ca^{2 +}$ (2) $Na^{+}$ (3) $Cl^{-}$ (4) $K^{+}$ 12. $The number of H_{2} O molecules participating in hydrogen bonding in CuSO_{4} \cdot 5 H_{2} O is/are$ (1) $4$ (2) $2$ (3) $1$ (4) $0$ 13. $Identify the correct statements about the hydrides. (I) In saline hydrides oxidation state of hydrogen is +1 (II) LaH is an example of interstitial hydride (III) NH_{3}, H_{2} O have the tendency to form hydrogen bonds (IV)Electrolysis of molten sodium hydride liberates H_{2} gas at cathode$ (1) $I & II only$ (2) $I & IV only$ (3) $II & IV only$ (4) $II & III only$ 14. $Given below are two statements: Statement I : H_{2} O_{2} can act as both oxidising and reducing agent in basic medium. Statement I I : In the hydrogen economy, the energy is transmitted in the form ofdihydrogen. In the light of th above statements, choose the correct answer from the options given below:$ (1) $Both statement I and statement II are false$ (2) $Both statement I and statement II are true$ (3) $Statement I is true but statement II is false$ (4) $Statement I is false but statement II is true$ 15. $The total number of isotopes of hydrogen and number of radioactive isotopes among, them$ (1) $3 and 2$ (2) $2 and 0$ (3) $3 and 1$ (4) $2 and 1$ 16. $Which of the following correctly represents copper sulphate pentahydrate?$ (1) $(Cu (SO_{4}) (H_{2} O)_{3}) 2 H_{2} O$ (2) $(Cu (SO_{4}) (H_{2} O)_{5})$ (3) $(Cu (H_{2} O)_{4}) SO_{4} \cdot H_{2} O$ (4) 17. $Decreasing order of the hydrogen bonding in following forms of water is correctly represented by A. Liquid water B. Ice C. Impure water$ (1) $A = B>C$ (2) $B > A > C$ (3) $C > B > A$ (4) $A > B > C$ 18. $Which of the following equation depicts the oxidizing nature of H_{2} O_{2} ?$ (1) $C l_{2} + H_{2} O_{2} \to 2 HCl + O_{2}$ (2) $Kl O_{4} + H_{2} O_{2} \to Kl O_{3} + H_{2} O + O_{2}$ (3) $2 I^{-} + H_{2} O_{2} + 2 H^{+} \to I_{2} + 2 H_{2} O$ (4) $I_{2} + H_{2} O_{2} + 2 O H^{-} \to 2 I^{-} + 2 H_{2} O + O_{2}$ 19. $The chemical nature of hydrogen peroxide is:$ (1) $Oxidizing agent in acidic medium, but not in basic medium.$ (2) $Reducing agent in basic medium, but not in acidic medium$ (3) $Oxidizing and reducing agent in acidic medium, but not in basic medium.$ (4) $Oxidizing and reducing agent in both acidic and basic medium.$ 20. $The single largest industrial application of dihydrogen is :$ (1) $Manufacture of metal hydrides$ (2) $Rocket fuel in space research$ (3) $In the synthesis of ammonia$ (4) $In the synthesis of nitric acid$ 21. $Calgonis used for water treatment. Which of the following statement is NOT true about calgon?$ (1) $Calgon contains the 2^{n d} most abundant element by weight in the earth's crust.$ (2) $It is also known as Graham's salt.$ (3) $It is polymeric compound and is water soluble.$ (4) $It doesnot remove Cat ion by precipitation.$ 22. $The synonym for water gas when used in the production of methanol is:$ (1) $natural gas$ (2) $fuel gas$ (3) $laughing gas$ (4) $syn gas$ 23. $How many millilitres of 20 volume H_{2} O_{2} solution is needed to react completely with 500 mL of acidified 1 N KMnO_{4} solution?$ (1) $224$ (2) $280$ (3) $140$ (4) $56$ 24. $In basic medium, H_{2} O_{2} exhibits which of the following reactions? (A) Mn^{2 +} \to Mn^{4 +} (B) I_{2} \to I^{-} (C) PbS \to PbSO_{4} Choose the most appropriate answer from the options given below:$ (1) $(A), (C) only$ (2) $(A) only$ (3) $(B) only$ (4) $A, (B) only$ 25. $Deuterium resembles hydrogen in properties but :$ (1) $reacts slower than hydrogen$ (2) $reacts vigorously than hydrogen$ (3) $reacts just as hydrogen$ (4) $emits β^{+} particles$ 26. $The metal that produces H_{2} with both dil HCl and NaOH_{(aq)} is$ (1) $Mg$ (2) $Ca$ (3) $Fe$ (4) $Zn.$ 27. $What is the % strength of 22.4 volume of H_{2} O_{2} solution?$ (1) $3.4 %$ (2) $2.5 %$ (3) $5 %$ (4) $6.8 %$ 28. $100 mL of a water sample contains 0.81 g of calcium bicarbonate and 0.73 g of magnesium bicarbonate. The hardness of this water sample expressed in terms of equivalents of CaCO_{3} is:(molar mass of calcium bicarbonate is 162 g mol^{- 1} and magnesium bicarbonate is 146 g mol^{- 1})$ (1) $5000 ppm$ (2) $1000 ppm$ (3) $100 ppm$ (4) $10, 000 ppm$ 29. $The strengths of 5.6 volume hydrogen peroxide (of density 1g/mL) in terms of mass percentage and molarity (M), respectively, are (Take molar mass of hydrogen peroxide as 34g/mol)$ (1) $1.7 and 0.5$ (2) $0.85 and 0.5$ (3) $1.7 and 0.25$ (4) $0.85 and 0.25$ 30. $The hydrides of which group elements of the periodic table form electron precise hydrides?$ (1) $group 12$ (2) $group 13$ (3) $group 14$ (4) $group 16$