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Saturated solution of $KNO_{3}$ is used to make 'salt bridge', because:

• A
  Velocity of $K ^{+}$is greater than $NO _3^{-}$
• B
  Velocity of $NO_{3}^{-}$ is greater than $K^{+}$
• ✓
  Velocity of both $K ^{+}$and $NO _3^{-}$are approximate the same
• D
  $KNO _3$ is highly soluble in water