Electrochemistry - Result Question 15
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:
- 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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