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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Only A, D, C are correct

Only A, B, D are correct

Only A, B, C are correct

Only B, C, D are correct

answer is A.

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Detailed Solution

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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