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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.