Question

Assertion (A): Reactivity of alkali metals decreases down the group.

Reason (R): Electropositive character of alkali metals decreases down the group.

Options

• If both A and R are true, and R is the correct explanation of A.

• If both A and R are true, but R is not the correct explanation of A.

• If A is true, but R is false.

• If both A and R are false.

Answer 1

If both A and R are false.

Explanation:

The chemical reactivity of alkali metals actually increases down the group because their atomic size grows, making it much easier for them to lose their valence electron during a reaction. Similarly, their electropositive character also increases down the group rather than decreasing, as the outer electron feels a weaker nuclear pull and is given up more readily. Consequently, both the assertion and the reason are completely incorrect statements.