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Calomal electrode is a...

Calomal electrode is a

A

redox electrode

B

metal-insoluble salt electrode

C

fas electrode

D

metal-metal ion electrode

Text Solution

Verified by Experts

The correct Answer is:
D
In a galvanic cell, ions move between the two solu-tions through a barrier called a salt bridge, a tube filled with a concentrated solution of a salt such as `KNO_(3)`, that does not participate in any reaction. A salt bridge allows ions to pass as needed to maintain electical neutrality but prevents the solutions from mixing. `KCl` can't be used as a salt bridge because it reacts with `AgNO_(3)` to form a precipitate of `AgCl`.
`KCl(ag)+AgNO_(3)(aq.) rarr AgCl(s)+KNO_(3)(aq.)`
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