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How changing ion concentrations changes the cell EMF

This type of question, asked 2 times: 8 Apr 2024, 23 Jan 2026 S1. All 2 questions below, oldest first.

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  1. Question 1

    8 Apr 2024

    135
    The emf of cell Tl∣Tl+(0.001M)∣∣Cu2+(0.01M)∣CuTl\left| \underset{(0.001M)}{Tl^{+}} \right|\left| \underset{(0.01M)}{Cu^{2 +}} \right|Cu is 0.83 V0.83\text{ }V at 298 K298\text{ }K. It could be increased by:

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  2. Question 2

    23 Jan 2026 S1

    30
    In the given electrochemical cell, Ag(s)∣AgCl(s)∣FeCl2(aq), FeCl3(aq)∣Pt(s)Ag(s)|AgCl(s)|FeCl_{2}(aq),\ FeCl_{3}(aq) \mid Pt(s) at 298 K , the cell potential (Ecell E_{\text{cell~}}) will increase when : (A) Concentration of Fe2+{Fe}^{2 +} is increased. (B) Concentration of Fe3+{Fe}^{3 +} is decreased (C) Concentration of Fe2+{Fe}^{2 +} is decreased (D) Concentration of Fe3+{Fe}^{3 +} is increased (E) Concentration of Cl−{Cl}^{-} is increased. Choose the correct answer from the options given below :

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