Which of the following reactions is used to estimate copper volumetrically?

2 C u^{2 +} + 4 C N^{-} \to C u_{2} (C N)_{2} + (C N)_{2}

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C u^{2 +} + 4 N H_{3} \to [C u (N H_{3})_{4}]^{2 +}

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2 C u^{2 +} + 2 C N S^{-} + S O_{2} + 2 H_{2} O \to C u_{2} (C N S)_{2} + H_{2} S O_{4} + 2 H^{+}

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2 C u^{2 +} + 4 I^{-} \to C u_{2} I_{2} + I_{2}

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Solution

The correct option is B $2 C u^{2 +} + 4 I^{-} \to C u_{2} I_{2} + I_{2}$
Copper can be estimated volumetrically by treating with potassium iodide. Iodine is liberated in the reaction which is titrated against sodium thiosulphate.
Also, during the reaction, we add sulphuric acid to prevent the hydrolysis of copper sulphate.
The reaction is as follows:
$2 C u^{2 +} + 4 I^{-} \to C u_{2} I_{2} + I_{2}$

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