Statement 1 (Assertion): GeO, SnO and PbO are more basic and ionic than the corresponding GeO_2, SnO_2 and PbO_2. Statement 2 (Reason): GeO_2 is acidic while SnO and PbO are amphoteric.

JEE Main Chemistry question

Statement 1 (Assertion): GeO, SnO and PbO are more basic and ionic than the corresponding , and . Statement 2 (Reason): is acidic while SnO and PbO are amphoteric.

(A)Assertion is True, Reason is True; Reason is correct explanation for AssertionCorrect
(B)Assertion is True, Reason is True; Reason is not correct explanation for Assertion
(C)Assertion is True, Reason is False
(D)Assertion is False, Reason is True

Answer: (A)

Solution

As oxidation state increases from +2 to +4 for these heavy p-block metals, the smaller, more highly charged cation polarises oxide ion more strongly, increasing covalent/acidic character; hence the +2 oxides (GeO, SnO, PbO) are more ionic and basic than the +4 dioxides. This is directly

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Question ID VK-138424