AP EAMCET · Chemistry · Electrochemistry

For which one of the following elements, $M^{3 +} ∣ M^{2 +}$ standard electrode potential is more positive?

A $V$
B $Cr$
C $Mn$
D $Fe$

Verified Solution

Answer & Solution

Correct Answer

(C) $Mn$

Step-by-step Solution

Detailed explanation

Element SEP( M3+/M2+) V V3+/V2+=-0.26 V Cr Cr3+/Cr2+=-0.4 V Mn Mn3+/Mn2+=1.5 V Fe Fe3+/Fe2+ =0.8 V Mn3+/Mn2+ has large positive value and M3+ is least stable as it can be easily reduced to Mn2+.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

List-I (aquated ion)	List-II (colour)
A)	\(\mathrm{Ni}^{2+}\)	I)	violet
B)	\(\mathrm{Fe}^{3+}\)	II)	blue
C)	\(\mathrm{Mn}^{3+}\)	III)	yellow
D)	\(\mathrm{V}^{4+}\)	IV)	red
		V)	green

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For which one of the following elements, M3+∣M2+ standard electrode potential is more positive?

Step-by-step Solution

For which one of the following elements, $M^{3 +} ∣ M^{2 +}$ standard electrode potential is more positive?