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Q.

In the salt bridge KCl is used because

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a

KCl is an electrolyte

b

K+ and Cl- ions are isoelectronic

c

K+and Cl- ions have same mobility

d

Agar agar forms good jelly with KCl

answer is C.

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Detailed Solution

If two solutions are directly linked while forming a cell,due to diffusion of ions with unequal speed a junction potential develops which adds up to the measured  EMF of the cell.Since a salt bridge contains KCl whose ions have same speed, junction potential does not develop.

 

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