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Question

The compound formed when excess of KCN is added to an aqueous solution of CuSO4 is
जब KCN के आधिक्‍य को CuSO4 के जलीय विलयन में मिलाया जाता है, तो बनने वाला यौगिक है

A
K2[Cu(CN)4]
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B
K[Cu(CN)3]
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C
[Cu(CN)2]
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D
K3[Cu(CN)4]
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