A) Both [A] and [R] are true and [R] is the correct explanation of [A]
B) Both [A] and [R] are true but [R] is not the correct explanation of [A]
C) [A] is true but [R] is not true
D) [A] is not true but [R] is true
Correct Answer: B
Solution :
\[KCN\] forms complex with \[C{{u}^{+}}\] and \[C{{d}^{2+}}\] 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.You need to login to perform this action.
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