$A$ saturated solution of $KNO_3$ with agar-agar is used to make a 'salt-bridge' because
- Asize of $K^{+}$ is greater than that of $NO_3^{-}$
- Bvelocity of $NO_3^{-}$ is greater than that of $K^{+}$
- Cvelocities of $K^{+}$ and $NO_3^{-}$ are nearly the same
- DBoth velocities and sizes of $K^{+}$ and $NO_3^{-}$ are nearly the same
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