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Assertion (A): The Cu+ ion is colourless. Reason (R): Four water molecules are coordinated to the Cu+ ion in aqueous solution. Choose the correct option.

1. Both (A) and (R) are true and (R) is the correct explanation of (A)
2. Both (A) and (R) are true but (R) is not the correct explanation of (A)
3. (A) is true but (R) is false
4. (A) is false but (R) is true

Correct answer: (A) is true but (R) is false

Solution

Cu+ has a fully filled 3d10 configuration, so no d-d transition is possible and it is colourless; however Cu+ is unstable in water and disproportionates, so the claim of stable [Cu(H2O)4]+ is false.

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