Electrolysis is carried out in three cells : (A) - 1.0 $M C u S O_{4},$ Pt electrodes; (B) - 1.0 $M C u S O_{4},$ , Copper electrode; (C) - 1.0 $M K C l$ , Pt electrodes. If the volume of electrolytic solution is maintained constant in each of the cells, which is correct set of pH changes in (A), (B) and (C) cells respectively?

increase in all the three

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decrease in all the three

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increase, constant, increase

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decrease, constant, increase

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Solution

The correct option is D
decrease, constant, increase

(A) $C a t h o d e : C u_{(a q)}^{2 +} + 2 e^{-} \to C u_{(S)} A n o d e : H_{2} O \to 2 H^{+} + \frac{1}{2} O_{2} + 2 e^{-}$

$p H d e c r e a s e s a s t h e n u m b e r o f H + i o n s i n c r e a s e .$

(B) $C a t h o d e : C u_{(a q)}^{2 +} + 2 e^{-} \to C u_{(s)} A n o d e : C u_{(s)} \to C u_{(a q)}^{2 +} + 2 e^{-}$

$p H r e m a i n s u n c h a n g e d a s t h e n u m b e r o f H + r e m a i n s u n c h a n g e d .$

(C) $C a t h o d e : 2 H_{2} O + 2 e^{-} \to H_{2} + 2 O H_{(a q)}^{-} A n o d e : 2 C l^{-} \to C l_{2 (a q)} + 2 e^{-}$

$p H i n c r e a s e s a s t h e n u m b e r o f H + i o n s d e c r e a s e s .$

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Similar questions

Electrolysis is carried out in three cells:

$(A) - 1.0 M C u S O_{4}$ , Pt electrodes;
$(B) - 1.0 M C u S O_{4}$ , Copper electrodes;
$(C) - 1.0 M K C I$ ,Pt electrodes. If volume of

electrolytic solution is maintained constant in

each of the cells, which is correct set of pH

changes in (A),(B) and (C) cells respectively:

1.0 M

C u {S O}_{4}

1.0 M

C u {S O}_{4}

1.0 M

K C l

Ω

C u S O_{4}

[H^{+}]

Ω

_{4}

^{+}

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