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Question

Assertion :HNO3 oxidises sulphur to H2SO4 acid (S+VI) but only oxidises selenium to H2SeO3 (Se+IV). Reason: In selenium atoms, the electrons are more tightly held by the nucleus on account of increased nuclear charge.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Assertion is incorrect but Reason is correct
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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Filling of 10 electrons in 3d-subshell enhances the effective nuclear charge on account of the poor shielding and thus the electrons are held more tightly. This is the reason why selenium is reluctant to attain the highest oxidation state of (VI).

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