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Q.

Standard electrode potentials areFe2+, Fe3+ and Fe blocks are kept together, then

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a

Fe3+ increases

b

Fe3+ decreases

c

Fe2+/Fe3+ remains unchanged

d

Fe2+ decreases

answer is B.

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Detailed Solution

SRP of Fe+2/Fe is negative , reduction of Fe+2 to Fe is non spontaneous. SRP of Fe+3/Fe+2 is positive,  reduction of Fe+3 to Fe+2 is spontaneous.When Fe+3,Fe+2,Fe blocks are kept together Fe+3 undergoes reduction spontaneously to form Fe+2. Hence Fe+3 concentration decreases and Fe+2 concentration increases.
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