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Q.

The positive value of the standard electrode potential of Cu2+/Cu indicates that

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a

this redox couple is a stronger reducing agent than the H+/H2 couple

b

this redox couple is a stronger oxidising agent than H+/H2 couple

c

Cu can displace H2 from acid

d

Cu cannot displace H2 from acid

answer is B.

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Detailed Solution

Lesser the Eo value of redox couple, higher is the reducing power.                Cu2++2e−⟶CuE∘=0.34V2H++2e−⟶H2E∘=0.00V      Since, 2H+/ H2 has lesser SRP than Cu2+ /Cu redox couple. Therefore,(i) This redox couple is a stronger oxidising agent than H+/H2.(ii) Cu cannot displace H2 from acids.
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