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Electrochemical Series

The standard ...

Question

The standard $E^{0}$ values of few redox couples are $Z n^{2 +} / Z n = - 0.76 V$ , $A g^{+} / A g = + 0.08 V$ , $C u^{2 +} / C u = 0.34 V$ . Choose the correct option?

A g

can oxidise

Z n

and

C u

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A g

can reduce

Z n^{2 +}

and

C u^{2 +}

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Z n

can reduce

A g^{+}

and

C u^{2 +}

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C u

can reduce

Z n^{2 +}

and

A g^{+}

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Solution

The correct option is D $Z n$ can reduce $A g^{+}$ and $C u^{2 +}$
Standard electrode potential of an element determines its tendency to gain electron or to get reduced.
From the standard $E^{0}$ values as $Z n^{2 +} / Z n = - 0.76 V$ , $A g^{+} / A g = + 0.08 V$ , $C u^{2 +} / C u = 0.34 V$
Since the order of the reduction potential is $Z n < A g < C u$
Therefore the tendency to get reduce is maximum for $C u$ , then $A g$ and last is for $Z n$ .
$A g$ can oxidise $Z n$ to $Z n^{2 +}$ and will reduce $C u^{2 +}$ to $C u$
$Z n$ can reduce both $A g^{+}$ and $C u^{2 +}$
$C u$ can oxidise both $A g^{+}$ and $Z n^{2 +}$

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Similar questions

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?

C u | C u^{2 +} (1 M) | | A g^{+} (1 M) | A g, E^{0} = 0.46 V

Z n | Z n^{2 +} (1 M) | | C u^{2 +} (1 M) | C u, E^{0} = 1.10 V

Z n | Z n^{2 +} (1 M) | | A g^{+} (1 M) | A g

C u | C u^{2 +} (1 M) | | A g^{+} (1 M) | A g, E^{o} = 0.46 V

Z n | Z n^{2 +} (1 M) | | C u^{2 +} (1 M) | C u, E^{o} = 1.10 V

Z n | Z n^{2 +} | | A g^{+} (1 M) | A g

(E^{\circ})

A g / A g^{+} (1 M) ∥ C u^{2 +} (1 M) | C u; E^{\circ} = - 0.46 v o l t

Z n / Z n^{2 +} (1 M) ∥ C u^{2 +} (1 M) | C u; E^{\circ} = + 1.10 v o l t

Z n | Z n^{2 +} (1 M) ∥ A g^{+} (1 M) | A g

E_{C u^{2 +} | C u}^{⊖} = 0.34 V, E_{Z n^{2 +} | Z n}^{⊖} = - 0.76 V

E_{A g^{\oplus} | A g}^{⊖} = 0.80 V

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