Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion: \[C{{u}^{2+}}\] and \[C{{d}^{2+}}\] are separated by first adding \[KCN\] solution and then passing \[{{H}_{2}}S\] gas. Reason: \[KCN\] reduces \[C{{u}^{2+}}\] to \[C{{u}^{+}}\] and form a complex with it.A) If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
B) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
C) If Assertion is true but Reason is false.
D) If both Assertion and Reason are false.
Correct Answer: B
Solution :
The correct explanation of assertion is \[KCN\] form complex with \[C{{u}^{+}}\] and \[C{{u}^{2+}}\] as \[{{K}_{3}}[Cu{{(CN)}_{4}}]\] and \[{{K}_{2}}[Cd{{(CN)}_{4}}]\] respectively. On passing \[{{H}_{2}}S\] only \[C{{d}^{2+}}\] complex gets decomposed to yellow CdS ppt.
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