(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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Assertion : An element X with the electronic configuration 1s22s22p63s23p4 can be expected to form a compound of the type H2XReason : Two additional electrons fill the valence shell of an element with outer electronic configuration 3s23p4

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for AssertionThe element X will form compound of type H2X as 3p orbital contains 4 electrons which will be shared with the 2 electrons of H to complete the outer electronic configuration.

Assertion : An element X with the electronic configuration $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{4}$ can be expected to form a compound of the type $H_{2} X$
Reason : Two additional electrons fill the valence shell of an element with outer electronic configuration $3 s^{2} 3 p^{4}$

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The element X will form compound of type $H_{2} X$ as $3 p$ orbital contains 4 electrons which will be shared with the 2 electrons of H to complete the outer electronic configuration.