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JEE Main levelSingle correct optionDifficulty 2 of 3cc056

Assertion (A): $[Zn (H X_{2} O) X_{6}] X^{2 +}$ is colourless. Reason (R): $Zn X^{2 +}$ is $d^{10}$ , so no d-d transition is possible.

ABoth Assertion and Reason are true and the Reason is the correct explanation of the Assertion
BBoth Assertion and Reason are true but the Reason is not the correct explanation of the Assertion
CAssertion is true but Reason is false
DAssertion is false but Reason is true

Answer: A

Zn X^{2 +}

is

3 d^{10}

and all d orbitals are full, so no electron can be promoted within the d subshell and visible light is not absorbed. Both statements are true and R explains A.

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