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The emf of cell Tl ( | (0.001 M ) Tl ⁺ | | (0.01 M ) Cu ²⁺ | Cu ) is (0.83 ~V ) at (298 ~K ). It could be increased by :

Options

  1. Adecreasing concentration of both ( Tl ⁺ ) and ( Cu ²⁺ ) ions
  2. Bincreasing concentration of ( Cu ²⁺ ) ions
  3. Cincreasing concentration of ( T1 ⁺ )ions
  4. Dincreasing concentration of both ( Tl ⁺ ) and ( Cu ²⁺ ) ions

Correct answer

B. increasing concentration of ( Cu ²⁺ ) ions

Step-by-step solution

array ll Anodic Reaction & [ T _ (s) T ⁺ _ ( aq ) + e ⁻ ] 2 Cathodic Reaction & Cu ⁺² _ ( aq ) +2 e ⁻ Cu _ ( s ) Overall Redox Reaction & 2 ~T _ ( s ) + Cu ⁺² _ ( aq ) 2 ~T _ ( aq ) ⁺+ Cu _ ( s ) array E _ cell = E _ cell ^o- 0.0591 2 [ T ⁺ ]^2 [ Cu ⁺² ] E _ cell increases by increasing concentration of [ Cu ⁺² ] ions.

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