Silver metal is recovered industrially by using the chemistry shown below. Which of the following statements is/are not true ?
$2 K [A g (C N)_{2}] + Z n \to 4 K_{2} [Z n (C N)_{4}] + 2 A g$

Ag has been oxidised and Zn reduced

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Ag has been reduced and Zn oxidised

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Both Ag and Zn have been oxidised

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Both Ag and Zn have been reduced

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Solution

The correct options are
B Ag has been oxidised and Zn reduced
C Both Ag and Zn have been oxidised
D Both Ag and Zn have been reduced
In the given displacementliaction, silver is recovered from the cyanide complex by using highly electropositive metal, Zn.

Here, oxidation state of silver changes from +1 to 0 and that of zinc changes from 0 to +2. Thus, Zn acts as a reducing agent and silver has been reduced.

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Similar questions

The standard oxidation potential of zinc and silver in water at 298 K are

Which of the following reactions actually take place

[A g (C N)_{2}]^{-}

2 [A g (C N)_{2}]^{-} + Z n \to [Z n (C N)_{4}]^{2 -} + 2 A g

Z n + 2 {O H}^{-} + 2 H_{2} O ⟶ Z n {(O H)}_{4}^{2 -} + H_{2}

The standard reducation potentials of

$Z n^{2 +} | Z n, C u^{2 +} | C u$ and $A g^{+} | A g$

are respectively -0.76, 0.34 and 0.8 V. The following cells were constructed.

a) $Z n | Z n^{2 +} | | C u^{2 +} | C u$

b) $Z n | Z n^{2 +} | | A g^{+} | A g$

c) $C u | C u^{2 +} | | A g^{+} | A g$

What is the correct order $E {^{0}}_{c e l l}$ of these cells?

E_{A g^{+} | A g}^{\circ} = 0.8

E_{Z n^{2 +} | Z n}^{\circ} = - 0.76

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