$A$ concentrated solution of $KNO_3$ is used in the preparation of a salt bridge because:
- AThe velocity of $K^+$ ion is greater than that of $NO_3^-$ ion.
- BThe velocity of $NO_3^-$ ion is greater than that of $K^+$ ion.
- CThe velocities of both $K^+$ and $NO_3^-$ ions are approximately the same.
- D$KNO_3$ is highly soluble in water.
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