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Q.

Melting point trend of 15th group elements is

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a

increases down the group

b

Decreases down the group

c

Increases up to As and then decreases

d

Decreases up to As and then increases

answer is C.

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Detailed Solution

M.P depends on packingFrom 'N' to 'As' as metallic character increases , MP increases.From As to Bi, MP decreases due to weaker intermetallic bonds in Antimony and Bismuth.
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Melting point trend of 15th group elements is