Electrochemistry 1 Question 15
15. Saturated solution of $\mathrm{KNO}_{3}$ is used to make ‘salt-bridge’ because
(2001, 1M)
(a) velocity of $\mathrm{K}^{+}$is greater than that of $\mathrm{NO}_{3}^{-}$
(b) velocity of $\mathrm{NO}_{3}^{-}$is greater than that of $\mathrm{K}^{+}$
(c) velocities of both $\mathrm{K}^{+}$and $\mathrm{NO}_{3}^{-}$are nearly the same
(d) $\mathrm{KNO}_{3}$ 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.
