JEE Chemistry Hydrogen MCQs Set 08

Download JEE MCQs for JEE Chemistry: Hydrogen

Explore reliable objective questions for Hydrogen tailored for JEE learners. Utilizing these Chemistry multiple-choice formats ensures thorough preparation and strengthens problem-solving speed for upcoming school assessments.

Chapter-wise Objective Questions: Hydrogen

Access the complete set of multiple-choice questions for Hydrogen below. This focused format allows students to isolate specific topics for thorough review and uninterrupted practice alongside official JEE textbooks.

Multiple Choice Questions

Question 1: The hydride ion H- is a stronger base than the hydroxide ion. Which of the following reactions will occur if NaH is dissolved in water?
(a) H-(aq) + H2O(l) → H3O+(aq)
(b) H-(aq) + H2O(l) → OH-(aq) + H2(g)
(c) H-(aq) + H2O(l) → no reaction
(d) None of these
Show Answer & Explanation

Answer: (b) H-(aq) + H2O(l) → OH-(aq) + H2(g)

Explanation:
1. H- is a stronger base than OH-, so it takes a proton from water.
2. NaH + H2O → NaOH + H2.
3. Answer: (b)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 2: Hydrogen peroxide is reduced by:
(a) Ozone
(b) Barium peroxide
(c) Acidic solution of KMnO4
(d) Lead sulphide
Show Answer & Explanation

Answer: (d) Lead sulphide

Explanation:
1. PbS + 4H2O2 → PbSO4 + 4H2O: H2O2 is the oxidising agent, so it is itself reduced.
2. Ozone, BaO2 and acidified KMnO4 oxidise or are oxidised by H2O2, and H2O2 acts as a reducing agent towards them.
3. Answer: (d)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 3: Water softening by Clarke's process uses:
(a) Calcium bicarbonate
(b) Sodium bicarbonate
(c) Potash alum
(d) Calcium hydroxide
Show Answer & Explanation

Answer: (d) Calcium hydroxide

Explanation:
1. Clarke's method removes temporary hardness by adding the calculated amount of slaked lime, which precipitates CaCO3 and Mg(OH)2.
2. Answer: (d)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 4: Which of the following isotopes of hydrogen is radioactive?
(a) 1H1
(b) 1H2
(c) 1H3
(d) Both 1H2 and 1H3
Show Answer & Explanation

Answer: (c) 1H3

Explanation:
1. Tritium (1H3) is a beta emitter with a half-life of about 12.3 years.
2. Protium and deuterium are stable.
3. Answer: (c)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 5: Which reaction is not used in the preparation of H2?
(a) Zn + NaOH
(b) Mg + NaOH
(c) Al + NaOH
(d) Be + NaOH
Show Answer & Explanation

Answer: (b) Mg + NaOH

Explanation:
1. Zn, Al and Be are amphoteric and react with NaOH liberating H2.
2. Mg is not amphoteric and does not react with NaOH.
3. Answer: (b)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 6: Which of the following is the water gas shift reaction?
(a) CO + H2O → CO2 + H2
(b) C + H2O → CO
(c) CO + O2 → CO2
(d) CO + H2 → CH3OH
Show Answer & Explanation

Answer: (a) CO + H2O → CO2 + H2

Explanation:
1. In the water-gas shift reaction carbon monoxide reacts with steam over a catalyst to give more hydrogen: CO + H2O → CO2 + H2.
2. Answer: (a)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 7: Which of the following cannot be oxidised by H2O2?
(a) Na2SO3
(b) PbS
(c) KI
(d) O3
Show Answer & Explanation

Answer: (d) O3

Explanation:
1. Na2SO3, PbS and KI are all oxidised by H2O2.
2. Ozone is a stronger oxidising agent and is reduced by H2O2 instead: H2O2 + O3 → H2O + 2O2.
3. Answer: (d)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 8: Which of the following reactions represents the oxidising property of H2O2?
(a) KMnO4 + H2SO4 + H2O2 → K2SO4 + MnSO4 + H2O + O2
(b) K3[Fe(CN)6] + KOH + H2O2 → K4[Fe(CN)6] + H2O + O2
(c) PbO2 + H2O2 → PbO + H2O + O2
(d) None of these
Show Answer & Explanation

Answer: (d) None of these

Explanation:
1. In all three reactions H2O2 is oxidised to O2, i.e. it acts as a reducing agent.
2. So none shows the oxidising property.
3. Answer: (d)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 9: Calgon, used as a water softener, is:
(a) Na6P6O18
(b) Na4P6O18
(c) Na6P4O18
(d) Na6P5O10
Show Answer & Explanation

Answer: (a) Na6P6O18

Explanation:
1. Calgon is sodium hexametaphosphate, Na6P6O18 (also written Na2[Na4(PO3)6]).
2. It holds Ca2+ and Mg2+ in a soluble complex.
3. Answer: (a)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 10: Which of the following is not present in clear hard water?
(a) Mg(HCO3)2
(b) CaCl2
(c) MgSO4
(d) MgCO3
Show Answer & Explanation

Answer: (d) MgCO3

Explanation:
1. MgCO3 is insoluble in water, so it cannot be dissolved in clear hard water.
2. The other three salts are soluble and cause hardness.
3. Answer: (d)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 11: What is formed when calcium carbide reacts with heavy water?
(a) C2D2
(b) CaD2
(c) Ca2D2O
(d) CD2
Show Answer & Explanation

Answer: (a) C2D2

Explanation:
1. CaC2 + 2D2O → Ca(OD)2 + C2D2.
2. The deuterium from heavy water ends up in deuterated ethyne.
3. Answer: (a)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 12: The adsorption of hydrogen by metals is called:
(a) Dehydrogenation
(b) Hydrogenation
(c) Occlusion
(d) Absorption
Show Answer & Explanation

Answer: (c) Occlusion

Explanation:
1. The uptake of gases, especially hydrogen, by metals such as Pd and Pt is called occlusion.
2. Answer: (c)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 13: An ionic compound is dissolved simultaneously in heavy water and simple water. Its solubility is:
(a) Higher in heavy water
(b) Lesser in heavy water
(c) The same in both
(d) Lesser in simple water
Show Answer & Explanation

Answer: (b) Lesser in heavy water

Explanation:
1. Heavy water has a lower dielectric constant and stronger intermolecular bonding, so ionic salts dissolve less in it.
2. Answer: (b)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 14: Hydrogen can be obtained by mixing steam and water gas at 673 K in the presence of Fe2O3 and Cr2O3. This process is called:
(a) Nelson's process
(b) Serpeck's process
(c) Bosch's process
(d) Parke's process
Show Answer & Explanation

Answer: (c) Bosch's process

Explanation:
1. This is the water-gas shift step of Bosch's process: CO + H2O → CO2 + H2.
2. Answer: (c)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 15: Which of the following hydrides is electron precise?
(a) B2H6
(b) NH3
(c) H2O
(d) CH4
Show Answer & Explanation

Answer: (d) CH4

Explanation:
1. In CH4 the number of electrons is exactly enough to form normal two-centre bonds with all four hydrogens.
2. B2H6 is electron deficient and NH3 and H2O are electron rich.
3. Answer: (d)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 16: The compound that gives H2O2 on treatment with dilute H2SO4 is:
(a) PbO2
(b) BaO2·8H2O
(c) MnO2
(d) TiO2
Show Answer & Explanation

Answer: (b) BaO2·8H2O

Explanation:
1. BaO2·8H2O + H2SO4 → BaSO4 + H2O2 + 8H2O.
2. This is a classical laboratory preparation of H2O2.
3. Answer: (b)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 17: Which of the following equations depicts the oxidising nature of H2O2?
(a) 2MnO4- + 6H+ + 5H2O2 → 2Mn2+ + 8H2O + 5O2
(b) 2Fe3+ + 2H+ + H2O2 → 2Fe2+ + 2H2O + O2
(c) 2I- + 2H+ + H2O2 → I2 + 2H2O
(d) 2KIO4 + H2O2 → 2KIO3 + H2O + O2
Show Answer & Explanation

Answer: (c) 2I- + 2H+ + H2O2 → I2 + 2H2O

Explanation:
1. In the iodide reaction H2O2 is reduced to water while I- is oxidised to I2.
2. In the other three options H2O2 is oxidised to O2, i.e. it acts as a reducing agent.
3. Answer: (c)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Question 18: Which of the following equations depicts the reducing nature of H2O2?
(a) 2[Fe(CN)6]4- + 2H+ + H2O2 → 2[Fe(CN)6]3- + 2H2O
(b) I2 + H2O2 + 2OH- → 2I- + 2H2O + O2
(c) Mn2+ + H2O2 → Mn4+ + 2OH-
(d) PbS + 4H2O2 → PbSO4 + 4H2O
Show Answer & Explanation

Answer: (b) I2 + H2O2 + 2OH- → 2I- + 2H2O + O2

Explanation:
1. In the iodine reaction H2O2 is oxidised to O2 and I2 is reduced to I-.
2. In the other three options H2O2 is reduced to water, so it acts as an oxidising agent.
3. Answer: (b)

Teacher's Note:
1. Work through each option against the rule or structure involved before choosing. Remember the exceptions your textbook lists.

Free study material for Chemistry

Multiple Choice Questions (MCQs) for JEE Chemistry Hydrogen

Download Multiple Choice Questions: Hydrogen (JEE Chemistry)

Test your conceptual understanding of Hydrogen with these targeted multiple-choice questions. Designed in alignment with the latest JEE curriculum for JEE Chemistry, these problem sets build accuracy and prepare students for objective exams.

Concept Clarification for Hydrogen

Each question includes structured solution keys mapped directly to standard JEE textbooks, helping students evaluate their reasoning and correct mistakes early in their revision.

Additional Study Resources for JEE Chemistry

Wrap up your chapter revision by testing your knowledge against standard question formats. Everything on our platform is provided free of charge.

FAQs

Where can I access latest JEE Chemistry Hydrogen MCQs Set 08?

You can get most exhaustive JEE Chemistry Hydrogen MCQs Set 08 for free on StudiesToday.com. These MCQs for JEE Chemistry are updated for the 2026-27 academic session as per JEE examination standards.

Are Assertion-Reasoning and Case-Study MCQs included in the Chemistry JEE material?

Yes, our JEE Chemistry Hydrogen MCQs Set 08 include the latest type of questions, such as Assertion-Reasoning and Case-based MCQs. 50% of the JEE paper is now competency-based.

How do practicing Chemistry MCQs help in scoring full marks in JEE exams?

By solving our JEE Chemistry Hydrogen MCQs Set 08, JEE students can improve their accuracy and speed which is important as objective questions provide a chance to secure 100% marks in the Chemistry.

Do you provide answers and explanations for JEE Chemistry Hydrogen MCQs Set 08?

Yes, Chemistry MCQs for JEE have answer key and brief explanations to help students understand logic behind the correct option as its important for 2026 competency-focused JEE exams.

Can I practice these Chemistry JEE MCQs online?

Yes, you can also access online interactive tests for JEE Chemistry Hydrogen MCQs Set 08 on StudiesToday.com as they provide instant answers and score to help you track your progress in Chemistry.