Assertion : $P F_{5}, S F_{6}$ and $H_{2} S O_{4}$ are the examples of expanded octet molecules. Reason: Octet rule is not applicable to the second period elements of the periodic table.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
In $P F_{5}, S F_{6}$ and $H_{2} S O_{4}$ , the central atom has more than eight valence electrons hence they exhibit expanded octet. This is possible due to availability of $3 d$ orbitals.
Elements in and beyond the third period of the periodic table do not follow octet rule thus it applies mainly to the second period elements of the periodic table.

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(a) Both assertion and reason are correct and the reason is correct explanation of assertion
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Assertion :PF5,SF6 and H2SO4 are the examples of expanded octet molecules. Reason: Octet rule is not applicable to the second period elements of the periodic table.

Assertion : $P F_{5}, S F_{6}$ and $H_{2} S O_{4}$ are the examples of expanded octet molecules. Reason: Octet rule is not applicable to the second period elements of the periodic table.