Saturated solution of KNO_3 is used to make a | vedclass

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(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

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(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.

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

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