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Q.

The 3d element with least melting point is

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a

Zn

b

Mn

c

Cu

d

Cr

answer is B.

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Detailed Solution

Cr, Mo, W of 6th group have the highest melting points in their respective transition series;

Due to the presence of more number of unpaired (n-1)d electrons and ns electrons the metallic bonding in chromium is strong;

Metallic bond strength  Melting point ;

Due to s2d10 configuration the metallic bonds in Zn, Cd and Hg are very weak ;

Zinc family belongs to d-block but these are not transition elements ;

In copper family, M.P of Cu>Au>Ag ;

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