MCQ
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : $PH _3$ has lower boiling point than $NH _3$.
Reason (R) : In liquid state $NH _3$ molecules are associated through vander waal's forces, but $PH _3$ molecules are associated through hydrogen bonding. In the light of the above statements, choose the most appropriate answer from the options given below:
  • A
    Both (A) and (R) are correct and (R) is not the correct explanation of (A)
  • B
    (A) is not correct but (R) is correct
  • C
    Both (A) and (R) are correct but (R) is the correct explanation of (A)
  • (A) is correct but (R) is not correct

Answer

Correct option: D.
(A) is correct but (R) is not correct
(D) Unlike $NH _3, PH _3$ molecules are not associated through hydrogen bonding in liquid state. That is why the boiling point of $PH _3$ is lower than $NH _3$.

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