Q.

Cuprous ion is colourless, while cupric ion is coloured because

 

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a

both have unpaired electrons in the d- subshell

 

b

cuprous ion has a complete d-subshell and cupric ion has an incomplete d-subshell

 

c

both have half-filed p-and d-subshell
 

d

cuprous ion has incomplete d-subshell and  cupric ion has complete d-subshell

answer is B.

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Detailed Solution

29Cu [Ar]4s13d10

Cu+1[Ar]4s03d10 (Cuprous) and Cu+2 [Ar]4s03d9 (Cupric ion)

cuprous ion has complete d-subshell so colour less and cupric ion has incomplete d-subshell so coloured.

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Cuprous ion is colourless, while cupric ion is coloured because