A half cell reaction- Ag2Ss - 2e- - 3Ags - S2- is carried out in a half cell PtAg2S - Ag- H2S 0-1 M at -H- - 10-3- The EMF of the half cell is- -E-Ag- - Ag - 0-80 V- KaH2S - 10-21- and Ksp of Ag2S - 10-49-

The correct option is A 0.1735 V H_2S ⇌ 2H^⊕ + S^2 K_a = [H^⊕]^2 [S^2 ][H_2S] = (10^ 3)^2 × [S^2 ]/0.1 ∴ [S^2 ] = 10^ 21 × 0.11 ...

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Representation of Cell

A half cell r...

Question

A half cell reaction: $A g_{2} S (s) + 2 e^{-} \to 3 A g (s) + S^{2 -}$ is carried out in a half cell $P t_{A g_{2} S | A g, H_{2} S (0.1 M)} a t [H^{\oplus}] = 10^{- 3},$ The EMF of the half cell is:
$[E_{A g^{\oplus} | A g}^{⊖} = 0.80 V, K_{a (H_{2} S)} = 10^{- 21}, a n d K_{s p} o f A g_{2} S = 10^{- 49}]$

- 0.1735 V

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- 0.19 V

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+ 0.1735 V

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0.19 V

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E^{\circ}

298 K

A g (N H_{3})_{2}^{+} + e^{-} \to A g + 2 N H_{3}

A g^{+} + e^{-} \to A g; E_{A g^{+} / A g}^{\circ} = 0.80 V

A g (N H_{3})_{2}^{+} ⇌ A g^{+} + 2 N H_{3}; K = 6 \times 10^{- 8}

P b^{2 +} + 2 e \to P b

(E^{o} = - 0.13 v)

A g^{+} + e \to A g

(E^{o} = + 0.80 v)

A g_{2} S (s) + 2 e^{-} ⇌ 2 A g (s) + S^{2 -} (a q)

p H = 3

0.1 M H_{2} S (a q) :

K_{s p} (A g_{2} S) = 10^{- 49}, K_{a_{1}} . K_{a_{2}} = 10^{- 21}

A g^{+} (a q .) + e^{-} \to A g (s); E^{\circ} = + 0.80 V

C d^{2 +} (a q .) + 2 e^{-} \to C d (s); E^{\circ} = - 0.40 V

{A g}^{+} + e^{-} ⟶ A g; E_{{A g}^{+} | A g}^{o} = - 0.3995 V

{F e}^{2 +} ⟶ {F e}^{3 +} + e^{-}; E_{{F e}^{3 +} | {F e}^{2 +}}^{o} = - 0.7120 V

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