Electrochemistry - Result Question 67

####15. Saturated solution of $KNO _3$ is used to make ‘salt-bridge’ because

(2001, 1M)

(a) velocity of $K^{+}$is greater than that of $NO _3^{-}$

(b) velocity of $NO _3^{-}$is greater than that of $K^{+}$

(c) velocities of both $K^{+}$and $NO _3^{-}$are nearly the same

(d) $KNO _3$ is highly soluble in water

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Answer:

Correct Answer: 15. (c)

Solution:

  1. One of the requirement for electrolyte used in salt-bridge is, both cation and anion must have comparable size so that they migrate towards electrodes of opposite polarity at comparable speeds.


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