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Standard XII

Chemistry

Preparation of Hydrogen

An aqueous so...

Question

An aqueous solution of NaCl on electrolysis gives H2,Cl2 and NaOH according to the equation 2Cl- aq + 2H2O =2OH- AQ + H2g +Cl2 g A direct current of 25ampere with a current efficiency of 62% is passed through 20l of NaCl solution (20% by weight) then, the time taken to produce 1kj of cl2 and the molarity of the solution wrt hydroxide ion is

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Q. An aqueous solution of NaCl on electrolysis gives

H_{2}

(g),

C l_{2}

(g) and NaOH according to reaction,

2 C l^{-} (a q) + 2 H_{2} O \to 2 O H^{-} (a q) + H_{2} (g) + C l_{2} (g)

A direct current of 25 ampere with a current efficiency of 62% is passed through 20 litre of NaCl solution (20% by mass) Write down the reactions taking place at the electrodes.
The redox changes are : Cathode:

2 C l^{-} \to C l_{2} + 2 e

Anode :

2 e + 2 H_{2} O \to 2 O H^{-} + H_{2}

Q. An aqueous solution of NaCl on electrolysis gives

H_{2} (g), C l_{2} (g)

and

N a O H

according to the reaction :

2 C l^{-} (a q) + 2 H_{2} O (l) ⟶ 2 O H^{-} (a q) + H_{2} (g) + C l_{2} (g)

A direct current of 25 amperes with a current efficiency of 62% is passed. Calculate the time required to produce 1 kg

C l_{2} (g)

Q. An aqueous solution of sodium chloride on electroysis gives

H_{2} (g), C l_{2} (g)

and

N a O H

according to the reaction:

2 C l^{-} (a q .) + 2 H_{2} O \to 2 O H^{-} (a q .) + H_{2} (g) + C l_{2} (g)

A direct current of

25

ampere with a current efficiency

62

% is passed through

20 L

N a C l

solution

(20

% by mass). Write down the reactions taking place at the anode and cathode. How long will it take to produce

1 k g

C l_{2}

? Assume no loss due to evaporation.

An aqueous solution of NaCl on elctrolysis gives $H_{2} (g)$ , $C l_{2} (g)$ , and $N a O H$ according to the reaction

$2 C l^{⊖} (a q) + 2 H_{2} O \to 2 ⊖ O H (a q) + H_{2} (g) + C l_{2} (g)$

A Direct current (DC) of 25 A with a current efficiency of 62 % is passed through 20 L of NaCl solution (20% by weight). The molarity (M) of the solution with respect to hydroxide ion will be X. The value of X is ( asssume no loss due to evaporation):

(write your answer to nearest integer)

Q. An aqueous solution of NaCl on electrolysis gives

H_{{2 (g)}^{'}}

C l_{2 (g)}

and NaOH according to the reaction

2 C l_{(a q)}^{-} + 2 H_{2} O ⇌ 2 O H_{(a q)}^{-} + H_{2 (g)} + C l_{2 (g)}

A direct current of 25 amperes with a current efficiency of 62% is passed through 20 liters of NaCl solution (20% by weight). Write down the reactions taking place at the anode and the cathode. How long will it take to produce 1 kg of

C l_{2}

? in hrs. (write the value to the nearest integer).

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