In the redox reaction MnO₂ + 4HCl → MnCl₂ + 2H₂O + Cl₂, the oxidizing agent is: MCQ with Answer and Explanation

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In the redox reaction MnO₂ + 4HCl → MnCl₂ + 2H₂O + Cl₂, the oxidizing agent is:

A. MnO₂

B. Cl₂

C. H₂O

D. HCl

Answer: Option A

Solution (By JKSSB Mock Tests)

MnO₂ oxidizes HCl (Cl⁻ to Cl₂) while itself being reduced (Mn⁴⁺ to Mn²⁺). Oxidizing agent (oxidant) accepts electrons and gets reduced. Here, MnO₂ accepts electrons from Cl⁻. HCl is the reducing agent (reductant) as it loses electrons. This reaction was used by Scheele to discover chlorine. Exam tip: The substance reduced is the oxidizing agent; the substance oxidized is the reducing agent.

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Question #1

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Assertion (A): Hydrogen is a better fuel than CNG. Reason (R): Hydrogen is highly explosive and difficult to store safely.

A. Both A and R are true but R is NOT the correct explanation of A.

B. A is true but R is false.

C. A is false but R is true.

D. Both A and R are true and R is the correct explanation of A.

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Correct Answer: Option A

Explanation:
Hydrogen has a higher calorific value than CNG, making it a better fuel in terms of energy output per unit mass. However, R states it is explosive and hard to store, which is a disadvantage, not the reason it is a better fuel. Thus, both are true, but R does not explain A.

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Question #2

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Which of the following is the main component of natural gas?

A. Methane

B. Propane

C. Ethane

D. Butane

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Correct Answer: Option A

Explanation:
Natural gas is a fossil fuel composed primarily of methane (CH4), typically making up 70-90% of its volume. It also contains smaller amounts of ethane, propane, butane, and other heavier hydrocarbons, along with non-hydrocarbon gases like carbon dioxide and nitrogen.

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Question #3

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In electroplating of copper on an iron spoon, the electrolyte used is:

A. Iron sulfate

B. Sulfuric acid

C. Copper sulfate solution

D. Sodium chloride solution

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Correct Answer: Option C

Explanation:
Acidified copper sulfate (CuSO₄) solution is the electrolyte. The iron spoon is the cathode, and a pure copper plate is the anode. Cu²⁺ ions are reduced at the cathode and deposited on the spoon. Fe from spoon does not go into solution because it is cathode.

This question belongs to: Science chemistry

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