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Question: Answered & Verified by Expert
A saturated solution of $\mathrm{KNO}_3$ with agar-agar is used to make a 'salt-bridge' because
ChemistryElectrochemistryAP EAMCETAP EAMCET 2021 (23 Aug Shift 2)
Options:
  • A size 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 $\mathrm{K}^{+}$and $\mathrm{NO}_3^{-}$are nearly the same
  • D Both velocities and sizes of $\mathrm{K}^{+}$and $\mathrm{NO}_3^{-}$are nearly the same
Solution:
1774 Upvotes Verified Answer
The correct answer is: velocities of $\mathrm{K}^{+}$and $\mathrm{NO}_3^{-}$are nearly the same
$\mathrm{KNO}_3$ is used in salt bridge because velocity of $\mathrm{K}^{+}$and $\mathrm{NO}_3^{-}$ions is same due to which ions do not accumulate.

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