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Question

Saturated solution of $$KNO_{3}$$ is used to make salt bridge because:


A
velocity of K+ ion is greater than that of NO3 ion
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B
velocity of NO3 ion is greater than that of K+ ion
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C
velocities of both K+ and NO3 ions are nearly the same
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D
KNO3 is highly soluble in water
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Solution

The correct option is B velocities of both $$K^{+}$$ and $$NO^{-}_{3}$$ ions are nearly the same
For a good salt bridge, the velocities of ions should be same. If the velocities are not same, then the ions would not be able to neutralize the charge equally in both half cells. Consequently, an opposite force would be developed that restricts the flow of current. For $$KNO_3$$, the velocities of $$K^+$$ and $$NO_3^-$$ are nearly same. Therefore, it is used to make salt bridges.
Hence, option c is correct.

Chemistry

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