An aqueous solution containing one mole per litre of each Cu(NO3)2, AgNO3,&

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An aqueous solution containing one mole per litre of each

C u (N O_{3})_{2}, A g N O_{3}, H g_{2} (N O_{3})_{2}

and

M g (N O_{3})_{2}

, is being electrolysed by using inert electrodes. The values of standard electrode potentials in volts (reduction potentials) are

A g / A g^{+} = + 0.80, 2 H g / H g_{2}^{2 +} = + 0.79, C u / C u^{2 +} = + 0.34, M g / M g^{2 +} = - 2.37

with increasing voltage, the sequence of deposition of metals on the cathode will be

Options:

A . Ag,Hg,Cu,Mg

B . Mg,Cu,Hg,Ag

C . Ag,Hg,Cu

D . Cu,Hg,Ag

Answer: Option C
:
C
A cationthat has thehighest reduction potential will be reduced first andso on.
However,

M g^{2 +}

in aqueous solution will not be reduced

(E_{M g^{2 +} / M g}^{\circ} < E_{_{H_{2} O} / \frac{1}{2} H_{2} + O H^{-}}) .

Instead water would be reduced in preference.

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