JEE Chemistry Hydrogen MCQs Set 03

Download JEE MCQs for JEE Chemistry: Hydrogen

Access targeted multiple-choice questions for Hydrogen designed to align with the latest JEE academic syllabus for JEE Chemistry. These objective practice sets help students evaluate their conceptual understanding and improve exam readiness.

Chapter-wise Objective Questions: Hydrogen

View or download the dedicated Hydrogen MCQ resource below. Practicing these 50 objective questions regularly builds familiarity with standard exam patterns and helps secure higher marks in final Chemistry evaluations.

Multiple Choice Questions

Question 1: Out of the following metals, which will give H2 on reaction with NaOH? I: Zn, II: Mg, III: Al, IV: Be
(a) I, II, III, IV
(b) I, III, IV
(c) II, IV
(d) I, III
Show Answer & Explanation

Answer: (b) I, III, IV

Explanation:
1. Zn, Al and Be are amphoteric and react with NaOH to liberate H2
2. Mg is not amphoteric and does not react with NaOH

Teacher's Note:
1. Amphoteric metals dissolve in alkali to give hydrogen.
2. Mg only reacts with acids.

Question 2: The gas used in the hydrogenation of oils in the presence of nickel as a catalyst is:
(a) methane
(b) ethane
(c) ozone
(d) hydrogen
Show Answer & Explanation

Answer: (d) hydrogen

Explanation:
1. Hydrogenation adds H2 across C=C bonds of unsaturated oils
2. Nickel is the catalyst, giving vanaspati ghee

Teacher's Note:
1. Hydrogenation converts liquid oils into solid fats.

Question 3: Hydrogen has the tendency to lose one electron and form H+. In this respect it resembles:
(a) alkali metals
(b) carbon
(c) alkaline earth metals
(d) halogens
Show Answer & Explanation

Answer: (a) alkali metals

Explanation:
1. Alkali metals lose one electron to form M+
2. Hydrogen has one valence electron like them

Teacher's Note:
1. Hydrogen is placed with group 1 on this basis.

Question 4: H2 gas cannot be obtained by:
(a) Be + NaOH
(b) Na + NaOH
(c) Mg + NaOH
(d) by (b) and (c) methods
Show Answer & Explanation

Answer: (d) by (b) and (c) methods

Explanation:
1. Be reacts with NaOH to give hydrogen
2. Na with aqueous NaOH only reacts with water, and Mg does not react with NaOH
3. So hydrogen is not obtained by (b) and (c)

Teacher's Note:
1. Amphoteric metals react with alkali.

Question 5: Deuterium, an isotope of hydrogen, is:
(a) radioactive
(b) non-radioactive
(c) heaviest
(d) lightest
Show Answer & Explanation

Answer: (b) non-radioactive

Explanation:
1. Deuterium (2H) is a stable isotope
2. Tritium is the radioactive one

Teacher's Note:
1. Protium, deuterium and tritium are the three isotopes.

Question 6: The hydride gap in the periodic table is from:
(a) group 7 to group 9
(b) group 5 to group 7
(c) group 4 to group 6
(d) group 7 to group 10
Show Answer & Explanation

Answer: (a) group 7 to group 9

Explanation:
1. Elements of groups 7, 8 and 9 form no hydrides
2. This region is called the hydride gap

Teacher's Note:
1. Group 6 elements (Cr) form CrH.

Question 7: Which reaction is called the water gas shift reaction?
(a) C(s) + H2O(g) gives CO(g) + H2(g)
(b) 3Fe(s) + 4H2O(steam) gives Fe3O4 + 4H2
(c) CH4 + H2O at 1270 K over Ni gives CO + 3H2
(d) CO(g) + H2O(g) at 673-773 K over FeCrO4 gives CO2(g) + H2(g)
Show Answer & Explanation

Answer: (d) CO(g) + H2O(g) at 673-773 K over FeCrO4 gives CO2(g) + H2(g)

Explanation:
1. The shift reaction converts CO of water gas into CO2 while producing more H2
2. It uses iron chromate catalyst

Teacher's Note:
1. CO2 is then removed by scrubbing.

Question 8: Which is a true statement about D2O and H2O?
(a) D2O has a lower dielectric constant than H2O
(b) NaCl is more soluble in D2O than in H2O
(c) both are correct
(d) none is correct
Show Answer & Explanation

Answer: (a) D2O has a lower dielectric constant than H2O

Explanation:
1. D2O has a slightly lower dielectric constant (78.06 against 78.39)
2. Ionic salts dissolve less in D2O

Teacher's Note:
1. Heavy water is a poorer solvent for ionic compounds.

Question 9: The reactions of heavy water are slow. The reason is:
(a) heavy water is associated
(b) heavy water is dissociated
(c) the bond energy of the D-O bond is high
(d) heavy water has a lower mass
Show Answer & Explanation

Answer: (c) the bond energy of the D-O bond is high

Explanation:
1. The D-O bond is stronger than the H-O bond
2. So reactions involving bond breaking are slower

Teacher's Note:
1. The effect is a kinetic isotope effect.

Question 10: Hard water passed through an ion exchange resin containing RCOOH group becomes free from:
(a) Cl-
(b) SO4 2-
(c) H3O+
(d) Ca2+
Show Answer & Explanation

Answer: (d) Ca2+

Explanation:
1. A cation exchange resin swaps H+ for Ca2+ and Mg2+
2. So the water loses its hardness cations

Teacher's Note:
1. Anion exchangers remove the anions in a second step.

Question 11: Permutit is a technical name given to:
(a) aluminates of Ca and Na
(b) hydrated silicates of Al and Na
(c) silicates of Ca and Na
(d) silicates of Ca and Mg
Show Answer & Explanation

Answer: (b) hydrated silicates of Al and Na

Explanation:
1. Permutit is sodium aluminium silicate (zeolite)
2. It exchanges Na+ for Ca2+ and Mg2+

Teacher's Note:
1. It is used for softening hard water.

Question 12: The formula of sodium zeolite used in the permutit process for softening water is:
(a) Na2O.Al2O3.SiO2.xH2O (as hydrated sodium aluminosilicate)
(b) Na2.Al2.Si2O4.xH2O
(c) Na2O.AlO3.SiO4.xH2O
(d) K2Al2SiO3.xH2O
Show Answer & Explanation

Answer: (a) Na2O.Al2O3.SiO2.xH2O (as hydrated sodium aluminosilicate)

Explanation:
1. Sodium zeolite is hydrated sodium aluminium silicate, Na2O.Al2O3.xSiO2.yH2O

Teacher's Note:
1. It acts as an ion exchanger.

Question 13: The compound sodium hexametaphosphate Na2[Na4(PO3)6] is called calgon because:
(a) it was developed by a scientist
(b) it was first developed in California
(c) it refers to calcium gone
(d) it is based on the name of the company which developed it
Show Answer & Explanation

Answer: (c) it refers to calcium gone

Explanation:
1. Calgon holds Ca2+ and Mg2+ in a soluble complex
2. The name means calcium gone

Teacher's Note:
1. Calgon softens water by complexation.

Question 14: Permanent hardness in water is due to the presence of:
(a) Ca+, Mg+
(b) CaCl2, MgCl2
(c) CaCO3, MgCO3
(d) all of these
Show Answer & Explanation

Answer: (b) CaCl2, MgCl2

Explanation:
1. Chlorides and sulphates of calcium and magnesium cause permanent hardness
2. Bicarbonates cause temporary hardness

Teacher's Note:
1. Boiling does not remove chlorides or sulphates.

Question 15: Temporary hardness of water is due to the presence of:
(a) CaCl2, MgSO4
(b) Ca2+, Mg2+
(c) K+, CaCO3
(d) Ca(HCO3)2, Mg(HCO3)2
Show Answer & Explanation

Answer: (d) Ca(HCO3)2, Mg(HCO3)2

Explanation:
1. Bicarbonates of Ca and Mg cause temporary hardness
2. Boiling precipitates the carbonates

Teacher's Note:
1. Clark's method also removes it.

Question 16: In which of the following methods of removal of hardness are Ca2+ and Mg2+ not separated from the sample of hard water?
(a) boiling of temporary hard water
(b) addition of sodium carbonate
(c) using sodium hexametaphosphate
(d) synthetic resins and zeolite method
Show Answer & Explanation

Answer: (c) using sodium hexametaphosphate

Explanation:
1. Calgon forms a soluble complex with Ca2+ and Mg2+
2. The ions stay in solution but no longer give hardness

Teacher's Note:
1. The other methods remove the ions.

Question 17: H2O2 is used for all of the following except as a:
(a) oxidant, reductant
(b) bleaching agent
(c) antiseptic
(d) catalyst
Show Answer & Explanation

Answer: (d) catalyst

Explanation:
1. H2O2 acts as oxidising or reducing agent, bleach and antiseptic
2. It is not used as a catalyst

Teacher's Note:
1. It is used as a mild disinfectant.

Question 18: In the reaction 2H2O2 gives 2H2O + O2, the oxidation state of oxygen changes as:
(a) only -1 to -2
(b) only -1 to 0
(c) both -1 to -2 and -1 to 0
(d) -1 to -3
Show Answer & Explanation

Answer: (c) both -1 to -2 and -1 to 0

Explanation:
1. Oxygen in H2O2 is -1
2. Part goes to -2 in water and part to 0 in O2
3. So it is a disproportionation

Teacher's Note:
1. Same species is oxidised and reduced.

Question 19:
Assertion (A): Decomposition of H2O2 is a disproportionation reaction.
Reason (R): The H2O2 molecule simultaneously undergoes both oxidation and reduction.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation

Answer: (a) Both A and R are true, and R is the correct explanation of A.

Explanation:
1. In 2H2O2 gives 2H2O + O2, oxygen goes from -1 to -2 and to 0
2. That is exactly disproportionation, so R explains A

Teacher's Note:
1. Disproportionation means one species is oxidised and reduced.

Question 20:
Assertion (A): The colour of old lead paintings can be restored by washing with a dilute solution of H2O2.
Reason (R): Black lead sulphide is oxidised by H2O2 to white lead sulphate.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation

Answer: (a) Both A and R are true, and R is the correct explanation of A.

Explanation:
1. Lead paintings darken as PbS forms
2. H2O2 oxidises black PbS to white PbSO4, so R explains A

Teacher's Note:
1. PbS + 4H2O2 gives PbSO4 + 4H2O.

Question 21:
Assertion (A): Hard water is not fit for washing clothes.
Reason (R): It contains Ca2+ and Mg2+ ions which form a precipitate with soap.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation

Answer: (a) Both A and R are true, and R is the correct explanation of A.

Explanation:
1. Ca2+ and Mg2+ give insoluble scum with soap
2. This wastes soap and leaves deposits

Teacher's Note:
1. Soap is a sodium salt of fatty acids.

Question 22:
Assertion (A): The rate of reaction CD4 + Cl2 is slow, whereas CH4 + Cl2 is fast.
Reason (R): This is due to the isotopic effect.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation

Answer: (a) Both A and R are true, and R is the correct explanation of A.

Explanation:
1. The C-D bond is stronger than the C-H bond
2. This kinetic isotope effect makes the reaction of CD4 slower

Teacher's Note:
1. The effect is large for H/D because their mass ratio is 2.

Question 23:
Assertion (A): Saline hydrides are non-volatile, non-conducting, crystalline solids.
Reason (R): Saline hydrides are compounds of hydrogen with most of the p-block elements.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation

Answer: (c) A is true, but R is false.

Explanation:
1. Saline (ionic) hydrides are non-volatile crystalline solids, so A is true
2. They are formed with s-block metals, not p-block elements, so R is false

Teacher's Note:
1. Ionic hydrides contain the H- ion.

Question 24: Statements about heavy water: (a) it is used as a moderator in nuclear reactors, (b) it is more associated than ordinary water, (c) it is a more effective solvent than ordinary water. The correct statements are:
(a) (a), (b) and (c)
(b) (b) and (c)
(c) (a) and (c)
(d) (a) and (b)
Show Answer & Explanation

Answer: (d) (a) and (b)

Explanation:
1. D2O slows down neutrons, so (a) is correct
2. D2O has stronger association, so (b) is correct
3. It is a poorer solvent for ionic substances, so (c) is wrong

Teacher's Note:
1. Heavy water dissolves ionic salts less.

Question 25: Which is not correct about D2O?
(a) 100 mL of it weighs more than 100 g
(b) it acts as a moderator
(c) the boiling point of D2O is 376 K
(d) it is used in exchange reactions for the study of reaction mechanism
Show Answer & Explanation

Answer: (c) the boiling point of D2O is 376 K

Explanation:
1. D2O is denser (1.1 g/mL), so (a) is true
2. The boiling point is about 374.6 K, not 376 K

Teacher's Note:
1. The other statements are accurate.

Question 26: When Ba(OH)2 is mixed with H2O2 and ClO2, the product formed is:
(a) Ba(ClO3)2
(b) Ba(ClO2)2
(c) Ba(OH)2
(d) HClO3
Show Answer & Explanation

Answer: (b) Ba(ClO2)2

Explanation:
1. 2ClO2 + Ba(OH)2 + H2O2 gives Ba(ClO2)2 + 2H2O + O2
2. H2O2 reduces ClO2 to chlorite

Teacher's Note:
1. Chlorine goes from +4 to +3.

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