Question

Assertion (A): Zn, Mg react with acids and liberate hydrogen gas.

Reason (R): More reactive metals react with acids and liberate hydrogen gas.

(1) A and R are correct, R is correct explanation of ‘A’

(2) A and R are correct, R is not correct explanation of ‘A’

(3)A is correct and ‘R’ is incorrect

(4)‘A’ is incorrect and R is correct.​

Answer 1

The metals react with acids to form salts and liberate hydrogen gas.

Explanation:

Assertion: Zinc(Zn) is a metal of d- block in the periodic table whereas magnesium(Mg) is an s-block element. Let us take an example of zinc and magnesium reacting with hydrochloric acid.

$Zn + 2HCl$ → $ZnCl_{2} +H_{2}$.

$Mg + 2HCl$ → $MgCl_{2} + H_{2}$

Here, hydrogen gas is evolving, thus assertion is correct.

Reason: When an acid reacts with metals it produces salt and hydrogen gas is evolved.No matter what metal it is, hydrogen is always getting evolved. So the reason is also a correct explanation to the assertion.

So, option 1 is correct.