Which of the following cells give the cell potentials

to be their standard values ?

Z n_{(s)} | Z n_{(a q)}^{+ 2} (0.01 M | | H_{3} O_{(a q)}^{+} (0.1 M) | | H_{2 (g)} (1 a t m), P t |

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C u_{(s)} | C u {^{2 +}}_{(a q)} (0.25 M) | | A g {^{+}}_{(a q)}) (0.5 M) | A g

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C d_{(} s) | C d {^{2 +}}_{(a q)} (0.01 M) | | p H = 1 | H_{2 (g)} (1 a t m), P t

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Z n_{(} s) | Z n {^{2 +}}_{(a q)} (0.1 M) | | p H = 1 | H_{2 (g)} (1 a t m), P t

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Solution

The correct options are
A $Z n_{(s)} | Z n_{(a q)}^{+ 2} (0.01 M | | H_{3} O_{(a q)}^{+} (0.1 M) | | H_{2 (g)} (1 a t m), P t |$
B $C u_{(s)} | C u {^{2 +}}_{(a q)} (0.25 M) | | A g {^{+}}_{(a q)}) (0.5 M) | A g$
C $C d_{(} s) | C d {^{2 +}}_{(a q)} (0.01 M) | | p H = 1 | H_{2 (g)} (1 a t m), P t$
The Nernst equation for the emf of the cell is $E_{c e l l}^{0} = E_{c e l l}^{0} - \frac{0.0592}{n} l o g \frac{⌊ p r o d u c t s ⌋}{⌊ r e a c t a n t s ⌋}$ . The cell potential will be equal to standard cell potential when the term $\frac{⌊ p r o d u c t s ⌋}{⌊ r e a c t a n t s ⌋}$ is equal to 1. This is true for the options A, B and C.

Suggest Corrections

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?

E_{c e l l}

P t (s) | H_{2} (g)_{1 a t m} | H A_{(K_{a} = 10^{- 7})} 1 M | | H B_{(K_{a} = 10^{- 5})} 1 M | H_{2} (g)_{1 a t m} | P t (s)

H_{2_{(} g)} (1 a t m) | H_{3} O^{+} (p H = 5.03) | | {A g^{+}}_{(a q .)} (x M) | A g_{(s)}

1.0 V .

E_{A g^{+}, A g}^{o} = + 0.8 V . [T = 25^{o} C]

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

Z n | Z n^{2 +} (1 M) | | H^{+} (1 M) | P t (H_{2}, 1 b a r), E_{c e l l}^{\circ} = 0.74 V

P t (H_{2}) | H^{+} (1 M) | | A g^{+} (1 M) | A g, E_{c e l l}^{\circ} = 0.80 V

E_{c e l l}

A g | A g^{+} (0.1 M) | | Z n^{2 +} (0.1 M) | Z n

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