$A$ saturated solution of $KNO_3$ is used to make a salt bridge because...
- AThe velocity of $K^{+}$ is greater than that of $NO_3^{-}$.
- BThe velocity of $NO_3^{-}$ is greater than that of $K^{+}$.
- CThe velocities of both $K^{+}$ and $NO_3^{-}$ are nearly the same.
- D$KNO_3$ is highly soluble in water.
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