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Entropy

Cu2+ ions wil...

Question

$C u^{2 +}$ ions will be reduced to $C u^{+}$ ions by the addition of an aqueous solution of_________.

K I

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K C l

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K S C N

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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
$2 C u^{2 +} + 5 I^{-} \to C u_{2} I_{2} ↓ + I_{3}^{-} W h i t e p p t$
$C u^{2 +} + 2 S C N^{-} \to C u (S C N)_{2} ↓ B l a c k p p t$
The precipitate decomposes slowly to form white copper (I) thiocyanate and thiocyanogen is formed.
$2 C u (S C N)_{2} ↓ 2 C u S C N ↓ + (S C N)_{2} ↑ W h i t e p p t$

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