Give below are two statements: One is labelled as Assertion A and the other is labelled as Reason R:

Assertion A: The stability order of +1 oxidation state of Ga, In and Tl is .

Reason R: The inert

Question

Give below are two statements: One is labelled as Assertion A and the other is labelled as Reason R:

Assertion A: The stability order of +1 oxidation state of Ga, In and Tl is .

Reason R: The inert pair effect stabilizes the lower oxidation state down the group.

In the light of the above statements, choose the correct answer from the options given below:

Canvas Classes · Accepted Answer

Assertion A: The stability of +1 oxidation state increases down Group 13: . This is correct — Tl(I) is the most stable.

Reason R: The inert pair effect — the reluctance of the ns² pair to participate in bonding — increases down the group due to poor shielding by d and f electrons. This stabilizes the lower (+1) oxidation state. ✓

R correctly explains A.

Answer: Option (3)

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