JEE Advanced Chemistry question

Statement 1: PCl5 and PbCl4 are thermally unstable Statement 2: They produce same gas on thermal decomposition

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

Answer: (B)

Solution

Both PCl5 (→ PCl3 + Cl2) and PbCl4 (→ PbCl2 + Cl2) are indeed thermally unstable, each decomposing on heating to release chlorine gas, making both Statement 1 and Statement 2 true as facts. However, the mere observation that both happen to evolve the same gas (Cl2) does not itself explain *why* each compound is

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Question ID VK-159279