These questions consist of two statements each, printed as Assertion and Reason. While answering these questions you are required to choose any one of the following four responses:
Assertion: `[Ti(H_2O)_6]^(3+)` is coloured while `[Sc(H_2O)_6]^(3+)` is colourless.
Reason: d-d transition is not possible in `[Sc(H_2O)_6]^(3+)`.

Options

A. (a) If both assertion and reason are true and the reason are true and reason is the correct explanation of the assertion.
B. (b) If both assertion and reason are true and reason is not the correct explanation of the assertion.
C. (c) If assertion is true but reason is false.
D. (d) If assertion is false but reason is true.

Answer

A

Explanation

Both assertion and reason are true and reason is the correct explanation of assertion. `[Sc(H_2O)_6]^(3+)` has no unpaired electron in its d subshell and thus d-d transition is not possible whereas `[Ti(H_2O)_6]^(3+)` has one unpaired electron in its d subshell which gives rise to `d-d` transition to impart colour.