Q.

When a metal rod of A is dipped in an aqueous solution of metal B (concentration of B2+ ion being 1 M) at 25oC, the standard electrode potentials are A2+/A=−0.76 volts, B2+/B=+0.34 volts

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a

A will gradually dissolve

b

Water will decompose into H2 and O2

c

No reaction will occur

d

B will deposit on A

answer is A.

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Detailed Solution

Since EA2+/Ao< EB2+/Bo . A has greater tendency to be oxidized. A+B+2→A2++B
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When a metal rod of A is dipped in an aqueous solution of metal B (concentration of B2+ ion being 1 M) at 25oC, the standard electrode potentials are A2+/A=−0.76 volts, B2+/B=+0.34 volts