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Q.

The standard reduction potentials for the two half-cell reactions are given below :
large C{d^{2 + }}_{left( {aq} right)} + ,2{e^ - }, to ,C{d_{left( s right)}};,{E^0}, = , - 0.40V

large A{g^ + }_{left( {aq} right)} + ,{e^ - } to ,A{g_{left( s right)}};,{E^0}, = ,0.80V    

The standard free energy change for the reaction large 2A{g^ + }_{left( {aq} right)}, + ,C{d_{left( s right)}}, to ,2A{g_{left( s right)}} + ,C{d^{2 + }}_{left( {aq} right)} is given by     

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a

115.8 kJ   

b

– 115.8 kJ

c

– 231.6 kJ   

d

231.6 kJ    

answer is C.

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Detailed Solution

ΔGo = -nFEo

= - 2 x 96500 x (0.8+0.4) = -231600 j = -231.6 kj

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