Question

For a cell represents as, Pt/H2 (1 atm) HCl(a=1) /Pt/O2(1 atm) e.m.f. of the cell = 1.12V , to start H2 or O2 evolution, an opposing voltage applied should be

Answer 1

Answer:

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.

Answer 2

Answer:1.7 V is required

Explanation:If the opposing voltage is slightly greater than 1.12 ,the cell reaction should be reversed and the evolution of Hydrogen and oxygen will should start. However,in reality an opposing voltage of 1.7 volt is required.