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Q.

For which element would XH3 be a stable species?

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a

S

b

C

c

CI

d

P

answer is C.

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Detailed Solution

According to Lewis structure of phosphine, the phosphorous has full octet becuase of the formation of  3 bonds with hydrogen  and so each of the hydrogen has its duplet full. 

PH3 is stable. (octet rule)

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