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The standard EMF for the cell reaction, $Zn + {Cu}^{2 +} \Leftrightarrow Cu + {Zn}^{2 +} is 1.10 volt at 25^{\circ} C .$ The EMF for the cell reaction, when 0.1 ${Cu}^{2 +} and 0 .1 M {Zn}^{2 +}$ solutions are used, at 25°C is:

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a

1.10V

b

0.110V

c

-1.10V

d

-0.110V

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detailed solution

Correct option is A

Ecell =Ecell ∘+0.0592log⁡Cu2+Zn2+=1.10+0=1.10

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The conductivity of a saturated solution of ${Ag}_{2} C_{2} O_{4}$ is $4 \times 10^{- 5} S c m^{- 1}$ at 25°C. Conductivity of water is $6 \times 10^{- 8} S c m^{- 1}$ . What is the approximate molar conductivity of $C_{2} O_{4}^{2 -}$ ion at infinite dilution, given molar conductivity of Ag+ ions at infinite dilution is $62 S c m^{2} / m o l$ and $K_{sp} ({Ag}_{2} C_{2} O_{4}) = 3 .2 \times 10^{- 11}$

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