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Q.

Given that the standard reduction potentials for M⁺/M and N⁺/N electrodes at 298 K are 0.52 V and 0.25 V respectively. Which of the following is correct in respect of the following electrochemical cell ?
M/M⁺ | | N⁺/N

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a

The standard EMF of the cell is – 0.77 V.

b

The overall cell reaction is a spontaneous reaction.

c

The standard EMF of the cell is – 0.27 V.

d

The standard EMF of the cell is 0.77 V.

answer is B.

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Detailed Solution

$E_{c e l l}^{0} = E_{c a t h o d e}^{0} - E_{a n o d e}^{0} = E_{r i g h t}^{0} - E_{l e f t}^{0}$

$E_{c e l l}^{0} = 0.25 - 0.52 = - 0.27 V$

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Given that the standard reduction potentials for M+/M and N+/N electrodes at 298 K are 0.52 V and 0.25 V respectively. Which of the following is correct in respect of the following electrochemical cell ?M/M+ | | N+/N