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Question : 8
Total: 36
Which three chemical substances are obtained when electricity is passed through an aqueous solution of brine? Write one industrial use of each.
Solution:
When electricity is passed through a concentrated solution of sodium chloride (called brine), it decomposes to form sodium hydroxide, chlorine and hydrogen gas.
2 NaCl (aq) + 2 H 2 O
2 NaOH (aq) + Cl 2 ↑ + H 2 ↑
(i) Use of Sodium hydroxide ( NaOH ) : It is used for making soaps and detergents.
(ii) Use of Chlorine( Cl 2 ) : It is used in the production of bleaching powder.
(iii) Use of hydrogen gas( H 2 ) : It is used to make ammonia for fertilisers; used as a fuel or margarine.
(ii) Use of Chlorine
(iii) Use of hydrogen gas
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