Q.

A) In a group the correct order of melting points is 3d < 4d < 5d
B) VI B group have highest melting points in any series
C) In 3d and 4d series, VIIB group elements have exceptionally low melting points
D) The correct order of melting points is Cu > Ag > Au

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a

Only A, D, C are correct

b

Only A, B, D are correct

c

Only A, B, C are correct

d

Only B, C, D are correct

answer is A.

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Detailed Solution

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Au,Cu,Ag

All have d10​ configuration. There is only 1e for metallic bonding. Now size of atoms or kernels increases down the group. Hence, metallic bonding weakness due to less attraction of electrons involved in metallic bonding.

Ag<Au<Cu

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A) In a group the correct order of melting points is 3d < 4d < 5dB) VI B group have highest melting points in any seriesC) In 3d and 4d series, VIIB group elements have exceptionally low melting pointsD) The correct order of melting points is Cu > Ag > Au