Assertion :The complex $K_{3} [C r (C_{2} O_{4})_{3}]$ when present in aqueous solution, will give test for $K^{+}$ , $C r^{3 +}$ and oxalate ions. Reason: The complex $K_{3} [C r (C_{2} O_{4})_{3}]$ will dissociate completely in solution.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is D Both Assertion and Reason are incorrect
In aqueous solution, the complex $K_{3} [C r (C_{2} O_{4})_{3}]$ dissociates into following ions.

$K_{3} [C r (C_{2} O_{4})_{3}] \to 3 K^{+} + [C r (C_{2} O_{4})_{3}]^{3 -} C o m p l e x i o n$

$[C r (C_{2} O_{4})_{3}]^{3 -}$ is a complex ion and will not dissociate in aqueous solutions.

Hence, it will not give test for $C r^{3 +}$ and $C_{2} O_{4}^{2 -}$ ions.

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Assertion :The complex K3[Cr(C2O4)3] when present in aqueous solution, will give test for K+,Cr3+and oxalate ions. Reason: The complex K3[Cr(C2O4)3] will dissociate completely in solution.

Assertion :The complex $K_{3} [C r (C_{2} O_{4})_{3}]$ when present in aqueous solution, will give test for $K^{+}$ , $C r^{3 +}$ and oxalate ions. Reason: The complex $K_{3} [C r (C_{2} O_{4})_{3}]$ will dissociate completely in solution.