(C) The primary requirement for an electrolyte in a salt-bridge is that the transport numbers (or ionic mobilities) of the cation and anion should be

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Velocities of both $K^+$ and $NO_3^-$ are nearly the same

(C) The primary requirement for an electrolyte in a salt-bridge is that the transport numbers (or ionic mobilities) of the cation and anion should be approximately equal. In a $KNO_3$ solution,the ionic velocities of $K^+$ and $NO_3^-$ are nearly the same. This ensures that the junction potential is minimized and the electrical neutrality is maintained efficiently across the two half-cells. Therefore,option $(C)$ is correct.

Class 12 Chemistry Electrochemistry Electrochemical cells

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Saturated solution of $KNO_3$ is used to make a 'salt-bridge' because:

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A
Velocity of $K^+$ is greater than that of $NO_3^-$
B
Velocity of $NO_3^-$ is greater than that of $K^+$
C
Velocities of both $K^+$ and $NO_3^-$ are nearly the same
D
$KNO_3$ is highly soluble in water

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IIT 2002 Paper All IIT years →

If $\lambda_{m}^{o}(Br^{-}) = 78.1 \, S \, cm^{2} \, mol^{-1}$,calculate $\lambda_{m}^{o}(K^{+})$ using the following data:

Electrolyte $\Lambda_{m}^{o} \, (S \, cm^{2} \, mol^{-1})$

$NaCl$ $126.5$

$NaBr$ $128.2$

$KCl$ $149.5$

Electrolyte	$\Lambda_{m}^{o} \, (S \, cm^{2} \, mol^{-1})$
$NaCl$	$126.5$
$NaBr$	$128.2$
$KCl$	$149.5$

Medium

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Given $\lambda^{\circ}_{Mg^{2+}} = 106 \ S \ cm^2 \ mole^{-1}$ and $\lambda^{\circ}_{SO_4^{2-}} = 160 \ S \ cm^2 \ mole^{-1}$. The value of $\lambda^{\circ}_{MgSO_4}$ (in $S \ cm^2 \ mole^{-1}$) is

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Which statement is correct for a fuel cell?

Easy

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For the Galvanic cell:
$Ag_{(s)} \, | \, Ag_2C_2O_{4(s)} \, | \, C_2O_4^{2-} (0.02 \ M) \, || \, Ag^{+}(0.5 \ M) \, | \, Ag_{(s)}$
$EMF$ of the cell is $0.264 \ V$ at $25 \ ^oC$. The $K_{sp}$ of $Ag_2C_2O_{4(s)}$ is:
$[Given: \frac{2.303RT}{F} = 0.06, \ \log 2 = 0.3]$

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The reaction $Zn_{(s)} + 2AgCl_{(s)} \to Zn^{2+}_{(aq)} + 2Ag_{(s)} + 2Cl^{-}_{(aq)}$ will take place in which of the following electrochemical cells?

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Saturated solution of $KNO_3$ is used to make a 'salt-bridge' because:

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If $\lambda_{m}^{o}(Br^{-}) = 78.1 \, S \, cm^{2} \, mol^{-1}$,calculate $\lambda_{m}^{o}(K^{+})$ using the following data: Electrolyte $\Lambda_{m}^{o} \, (S \, cm^{2} \, mol^{-1})$ $NaCl$ $126.5$ $NaBr$ $128.2$ $KCl$ $149.5$

Given $\lambda^{\circ}_{Mg^{2+}} = 106 \ S \ cm^2 \ mole^{-1}$ and $\lambda^{\circ}_{SO_4^{2-}} = 160 \ S \ cm^2 \ mole^{-1}$. The value of $\lambda^{\circ}_{MgSO_4}$ (in $S \ cm^2 \ mole^{-1}$) is

Which statement is correct for a fuel cell?

For the Galvanic cell:$Ag_{(s)} \, | \, Ag_2C_2O_{4(s)} \, | \, C_2O_4^{2-} (0.02 \ M) \, || \, Ag^{+}(0.5 \ M) \, | \, Ag_{(s)}$$EMF$ of the cell is $0.264 \ V$ at $25 \ ^oC$. The $K_{sp}$ of $Ag_2C_2O_{4(s)}$ is:$[Given: \frac{2.303RT}{F} = 0.06, \ \log 2 = 0.3]$

The reaction $Zn_{(s)} + 2AgCl_{(s)} \to Zn^{2+}_{(aq)} + 2Ag_{(s)} + 2Cl^{-}_{(aq)}$ will take place in which of the following electrochemical cells?

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If $\lambda_{m}^{o}(Br^{-}) = 78.1 \, S \, cm^{2} \, mol^{-1}$,calculate $\lambda_{m}^{o}(K^{+})$ using the following data:

Electrolyte $\Lambda_{m}^{o} \, (S \, cm^{2} \, mol^{-1})$

$NaCl$ $126.5$

$NaBr$ $128.2$

$KCl$ $149.5$

For the Galvanic cell:
$Ag_{(s)} \, | \, Ag_2C_2O_{4(s)} \, | \, C_2O_4^{2-} (0.02 \ M) \, || \, Ag^{+}(0.5 \ M) \, | \, Ag_{(s)}$
$EMF$ of the cell is $0.264 \ V$ at $25 \ ^oC$. The $K_{sp}$ of $Ag_2C_2O_{4(s)}$ is:
$[Given: \frac{2.303RT}{F} = 0.06, \ \log 2 = 0.3]$