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NEET levelSingle correct optionDifficulty 1 of 3ec090

Which of the following is a concentration cell?

A $Zn ∣ Zn X^{2 +} (1 M) ∣∣ Cu X^{2 +} (1 M) ∣ Cu$
B $Ag ∣ AgNO X_{3} (0.01 M) ∣∣ AgNO X_{3} (0.1 M) ∣ Ag$
C $Pt ∣ H X_{2} (1 bar) ∣ HCl (1 M) ∣ AgCl (s) ∣ Ag$
D $Pt ∣ Fe X^{3 +}, Fe X^{2 +} ∣∣ Ce X^{4 +}, Ce X^{3 +} ∣ Pt$

Answer: B

A concentration cell has the same electrode material and the same electrolyte on both sides, differing only in concentration (or gas pressure). Only

Ag ∣ AgNO X_{3} (0.01 M) ∣∣ AgNO X_{3} (0.1 M) ∣ Ag

fits. Its

E_{cell}^{\circ} = 0

and the EMF arises purely from the concentration difference.

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