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NH(3) has higher boiling point than PH(3...

`NH_(3)` has higher boiling point than `PH_(3)`. Give reason.

Text Solution

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Due the presence of a lone pair of electrons on N and P, both `NH_(3) and PH_(3)` act as Lewis bases and accept a proton to form an additional N-H and P-H bonds respectively

However, due to smaller size of N over P, N-H bond thus formed is much stronger than the P-H bond. Therefore, `NH_(3)` has higher proton affinity than `PH_(3)`. In other words, `NH_(3)` is more basic than `PH_(3)`.
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Knowledge Check

  • NH_(3) has higher boiling point than expected because

    A
    It froms `NH_(4)OH ` with water
    B
    It has intramolecular hydrogen bonds
    C
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    D
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  • Asseration: O_(3) has higher boiling point than O_(2) . Reason: O_(3) is allotrope of oxygen

    A
    If both the asseration and reason are ture and reason is the true explation of the assertion.
    B
    If both the asseration and reason are ture but the reason is not the correct explanation of assertion.
    C
    If the asseration is true but reason is false.
    D
    If asseration is false bit reason is true.

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