Q. Match Column-I with Column-II.
Column I Column II
A Cell in which electrolyte is a paste of and . This cell is used in low current devices like hearing aids, watches, etc. p fuel cell
B Cell in which solution is used as an electrolyte. q Mercury cell
C Cell in which vapours produced during electrochemical reaction were condensed and added to drinking water r Lead storage battery
D Cell having longer life than lead storage cell and is expensive to manufacture s Nickel-Cadmiumcell

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Solution:

Correct answer is (b)