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The standard reduction potentials for Zn2+/Zn,Ni2+/Ni and Fe2+/Fe are -0.76, -0.23 and -0.44V respectively. The reaction X+Y2X2++Y will be spontaneous when :


( A ) X=Ni,Y=Fe
( B ) X=Fe,Y=Zn
( C ) X=Zn,Y=Ni
( D ) X=Ni,Y=Zn

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