Correct the statements of the following are

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In auto reduction process of copper. The part of cuprousulphide is oxidized with cuprous oxide to form a free copper metal. The balanced equation is as follows
${Cu}_{2} S + {Cu}_{2} O \to xCu + {SO}_{2}$ . The value of ‘x’ is ‘6’

Number of ligands in the stable volatile complex formed during the extraction of Ni by Mond’s process is ‘4’

The percent impurity in 23 carat gold is nearly four

The metal which cannot be obtained by electrolysis of an aqueous solution of its salt in Cu

answer is A, B, C.

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Detailed Solution

1) ${Cu}_{2} S + 2 {Cu}_{2} O \to 6 Cu + {SO}_{2}$
2) $Ni + 4 CO \overset{330 - 350 k}{\to} Ni (CO)_{4}$
3) 24 carat gold = 100% pure
$23 carat gold = \frac{23}{24} \times 100 = 95 .83 = 96$
Hence % impurity is nearly 4
4) Cu can be extracted by the electrolysis of its salt $(E_{{Cu}^{2 +} / cu}^{0} = + 0 .34 v)$