A saturated solution of $\mathrm{KNO}_3$ with agar-agar is used to make a 'salt-bridge' because

A saturated solution of $\mathrm{KNO}_3$ with agar-agar is used to make a 'salt-bridge' because
  1. size of $\mathrm{K}^{+}$is greater than that of $\mathrm{NO}_3^{-}$
  2. velocity of $\mathrm{NO}_3^{-}$is greater than that of $\mathrm{K}^{+}$
  3. velocities of $\mathrm{K}^{+}$and $\mathrm{NO}_3^{-}$are nearly the same
  4. Both velocities and sizes of $\mathrm{K}^{+}$and $\mathrm{NO}_3^{-}$are nearly the same

Solution

$\mathrm{KNO}_3$ is used in salt bridge because velocity of $\mathrm{K}^{+}$and $\mathrm{NO}_3^{-}$ions is same due to which ions do not accumulate.

Asked in: AP EAMCET 2021 (23 Aug Shift 2)

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