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Question

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.

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
Both Assertion and Reason are incorrect
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Solution

The correct option is C Assertion is correct but Reason is incorrect
In PF5,SF6 and H2SO4, the central atom has more than eight valence electrons hence they exhibit expanded octet. This is possible due to availability of 3d 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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