Assertion (A): Methanol is highly toxic and can cause blindness if ingested. Reason (R): Methanol is metabolized in the body to formaldehyde and formic acid. MCQ with Answer and Explanation

Question

Assertion (A): Methanol is highly toxic and can cause blindness if ingested. Reason (R): Methanol is metabolized in the body to formaldehyde and formic acid.

A. A is true but R is false.

B. A is false but R is true.

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

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

Answer: Option D

Solution (By JKExamLibrary)

Methanol (wood alcohol) is highly toxic. When ingested, it is metabolized by the enzyme alcohol dehydrogenase into formaldehyde and then formic acid. Formic acid interferes with mitochondrial function, leading to metabolic acidosis, optic nerve damage, and blindness. Both statements are correct and R explains A.

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Question #1

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During electroplating of silver on a copper spoon, the electrolyte used is:

A. Sodium chloride solution

B. Copper sulfate solution

C. Silver nitrate solution

D. Copper nitrate solution

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Correct Answer: Option C

Explanation:
In electroplating, the electrolyte must contain the ions of the metal to be deposited. To plate silver, a solution of a silver salt, such as silver nitrate (AgNO₃) or silver cyanide, is used. The anode is pure silver, and the cathode is the copper spoon to be plated.

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Question #2

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Plaster of Paris hardens on mixing with water due to formation of:

A. CaSO₄

B. CaSO₄·½H₂O

C. CaSO₄·2H₂O

D. CaO

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Correct Answer: Option C

Explanation:
Plaster of Paris (CaSO₄·½H₂O) reacts with water to form gypsum (CaSO₄·2H₂O) which sets into a hard solid mass with slight expansion. Reaction: CaSO₄·½H₂O + 1½H₂O → CaSO₄·2H₂O. This property is used for casting and setting broken bones.

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Question #3

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In a redox reaction:

A. Only reduction occurs.

B. Neither oxidation nor reduction occurs.

C. Oxidation and reduction occur simultaneously.

D. Only oxidation occurs.

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Correct Answer: Option C

Explanation:
Redox stands for reduction-oxidation. In any redox reaction, oxidation (loss of electrons) and reduction (gain of electrons) always occur simultaneously. The substance oxidized acts as a reducing agent, and the substance reduced acts as an oxidizing agent. One cannot happen without the other.

This question belongs to: Science chemistry

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