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Electrolysis and Electrolytes

100 mL of buf...

Question

100 mL of buffer of 1 M $N H_{3} (a q)$ and 1 M $N H_{4}^{\oplus} (a q)$ are placed in two compartments of a voltaic cell separately. A current of 1.5 A is passed through both cells for 20 min. If only electrolysis of water takes place, then:

A

pH of LHE half cell will increase

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B

pH of RHE half cell will increase

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C

pH of both half cell will increase

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D

pH of both half cell will decrease

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Solution

The correct option is B pH of RHE half cell will increase
Cathode (RHE) L $2 H_{2} O (l) + 2 e^{-} \to H_{2} (g) + 2 ⊖ O H (a q)$
Anode (LHE) : $2 H_{2} O (l) \to O_{2} (g) + 4 H^{\oplus} (a q) + 4 e^{-}$ In RHE, $⊖ O H$ will be produced which will react with $N H_{4}^{\oplus} (s a l t)$ to form $N H_{4} O H (b a s e)$ , causing pOH to decrease or pH to increase.
In LHE, $H^{\oplus}$ will be produced with will react with $N H_{4} O H$ (base)
to form $N H_{4}^{\oplus}$ (salt), causing pOH to increase or pH to decrease.

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Similar questions

Q. 100ml of a buffer of

1 M N H_{3} (a q) a n d {1 M N H_{4}}^{+} (a q)

are placed in two half cells separately. A current of 1.5amp is passed through both half cells for 20min, if electrolysis of only water take place. The pH of :

100 m L

of a buffer of 1 M

N H_{3} (a q)

1 M

N H_{4}^{\oplus} (a q)

are placed in two voltaic cells separately. A current of

1.5 A

is passed through both cells for

20 m i n

. If the electrolysis of water only takes place :

2 H_{2} O + O_{2} + 4 e^{-} \to, 4 ⊖ O H (R H S)

2 H_{2} O \to H^{\oplus} + O_{2} + 4 e^{-} (L H S)

In a galvanic cell, the reactions taking place in the anodic half cell and the cathodic half cell will be:

I_{2} (S) | I (0.1 M)

half cell is connected to

H_{(a q)}^{+} | H_{2} (1 a t m) | P t

half cell and its half cell potential is found to be 0.7714 V. If

E_{I_{2} / I}^{o} = 0.535 V

H^{+} / H_{2}

half cell will be:

Question 38
If cells of onion peel and RBC are separately kept in hypotonic solution, what among the following will take place? Explain the reason for your answer.

(a) Both the cells will swell.
(b) RBC will burst easily while cells of onion peel will resist the bursting to some extent.
(c) a and b both are correct.
(d) RBC and onion peel cells will behave similarly.

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