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1. Saturated solution of KNO3 is used to make salt bridge because
(a) velocity of K+ is greater than that of NO3-
(b) velocity of NO3- IS GREATER than that of K+
(c) velocity of both K+ and NO3- are nearly the same
(d) KNO3 IS higly ssoluble in water
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2 Answers
1As electrons leave one half of a galvanic cell and flow to the other, a difference in charge is established. If no salt bridge were used, this charge difference would prevent further flow of electrons. A salt bridge allows the flow of ions to maintain a balance in charge between the oxidation and reduction vessels while keeping the contents of each separate. With the charge difference balanced, electrons can flow once again, and the reduction and oxidation reactions can proceed.
