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Please help! - Redox Reaction and Electrochemistry - JEE Main-2

A mangenese electrode is immersed in a 2.0 M solution of $MnCl_2$  as cathod , and a mangenese electrode immersed in a $5.2 \times 10^{-2}M$ solution of $MnSo_4$ as the anode (T= 25 C) . What is the emf ?

• Option 1)

0.47 V

• Option 2)

0.047 V

• Option 3)

0.053 V

• Option 4)

0.53 V

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As we have learned

Concentration Cells -

A cell in which electrical energy is produced by the transference of a substance from a system of high concentration to one at low at low concentration is known as concentration cells.

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This is concentration cell

$Mn_{2m}^{2+} \rightarrow Mn _{5.2 \times 10^{-2}M}^{2+}$

$E_{cell } = E^{0}-\frac{0.0591}{2}log \left ( \frac{5.2 \times 10^{-2}}{2} \right )= 0.047$

Option 1)

0.47 V

Option 2)

0.047 V

Option 3)

0.053 V

Option 4)

0.53 V

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