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Question

Cu2+ ions will be reduced to Cu+ ions by the addition of an aqueous solution of_________.

A
KI
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B
KCl
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C
KSCN
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D
both (a) and (c)
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Solution

The correct option is D both (a) and (c)
All of these can be used as
2Cu2++5ICu2I2+I3Whiteppt
Cu2++2SCNCu(SCN)2Blackppt
The precipitate decomposes slowly to form white copper (I) thiocyanate and thiocyanogen is formed.
2Cu(SCN)22CuSCN+(SCN)2Whiteppt

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