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Assertion (A): On adding dil. HCl to a test tube containing a substance ‘X’, a colourless gas is produced which gives a pop sound when a burning match stick is brought near it.

Reason (R): In this reaction metal ‘X’ is displaced by Hydrogen.

Answer these questions by selecting the appropriate option given below:

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

B. Both A and R are true, and R is not the correct explanation of A.

C. A is true but R is false.

D. A is false but R is true

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Correct option is (C) A is true but R is false.

The metal displaces hydrogen from the hydrochloric acid, not the other way around.

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