Multiple Choice QuestionsThe electronic configuration of Cu is
[Ne] 3s2, 3p6, 3d9, 4s2
[Ne] 3s2, 3p6, 3d10, 4s1
[Ne] 3s2, 3p6, 3d3, 3d9, 4s2, 4p6
[Ne] 3s2, 3p6, 3d5, 4s2, 4p4
Assertion: Cuprous ion (Cu+) is colorless whereas cupric ion (Cu2+) is blue in the aqueous solution.
Reason: Cuprous ion (Cu+) has unpaired electrons while cupric ion (Cu2+) does not.
If both assertion and reason are true and reason is a correct explanation of the assertion.
If both the assertion and reason are true but the reason is not a correct explanation of the assertion.
If the assertion is true but the reason is false.
If both the assertion and reason are false.
C.
If the assertion is true but the reason is false.
Cuprous ions (Cu+) is colourless because it has no unpaired electrons in the 3d sub-shell as it has 3d configuration. The cupric ion (Cu2+) has one unpaired electron as it has configuration 3d10. By absorbing the visible light, the unpaired electron can migrate from one set of d-orbitals to another under the applied field of water molecules. Hence, cupric ion (Cu2+) in aqueous solution shows a blue colour.
The stable bivalency of Pb and trivalencey of Bi is:
due to d contraction in Pb and Bi
due to relativistic contraction of the 6s orbitals of Pb and Bi, leading to inert pair effect
due to screening effect
due to the attainment of noble liquid configuration
A magnetic moment of 1.73 BM will be shown by one among the following
[Cu(NH3)4]2+
[Ni(CN)4]2-
TiCl4
[CoCl6]4-
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