Saturated solution of KNO3 is used to make salt bridge because:
velocity of K+ ion is greater than that of NO−3 ion
velocities of both K+ and NO−3 ions are nearly the same
velocity of NO−3 ion is greater than that of K+ ion
KNO3 is highly soluble in water
A
KNO3 is highly soluble in water
B
velocities of both K+ and NO−3 ions are nearly the same
C
velocity of K+ ion is greater than that of NO−3 ion
D
velocity of NO−3 ion is greater than that of K+ ion
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Solution
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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 KNO3, the velocities of K+ and NO−3 are nearly same. Therefore, it is used to make salt bridges.
Hence, option c is correct.
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