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A galvanic cell is composed of two hydrogen electrodes, one of which is a standard one. In which of the following solutions should the other electrode be immersed to get maximum e.m.f.?

(a) 0.1 M HCl

(b) 0.1 M CH3COOH

(c) 0.1 M H3PO4

(d) 0.1 M H2SO4