The standard reduction potentials of three electodes P, Q and R are respectively – 1.76 V, 0.34 V and 0.8 V. Then

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Metal P will displace the cation of R from its aqueous solution and deposit the metal R

Metal R will displace the cation of Q and deposit the metal Q.

Both metals Q and R will displace the cation of P from its aqueous solution and deposit the metal P

Metal Q will displace the cation of P from its aqueous solution and deposit the metal P

answer is C.

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Detailed Solution

The metal that has less standard reduction electrode potential or more negative reduction potential, can displace the other metals (cations) from their aqueous solution. Among the given, P has most negative standard reduction potential, so it will displace Q and R cations from the aqueous solution and deposit them.

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