p-Block elementsHard

Question

In group 15, the melting points of the elements :

Options

A.increase regularly on moving down the group.
B.decrease regularly on moving down the group.
C.first decrease upto As and then increase to Bi.
D.first increase from N to As and then decrease to Bi.

Solution

Element    Melting point
    N        63 K
    P        317 K
    As      1089 K
    Sb       904 K
    Bi        544 K

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