CBSE Class 10 Science 2015 Term I Set 1

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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.
2NaCl (aq) +2H2O
Electricity
2
NaOH
(aq)
+Cl2
+H2

(i) Use of Sodium hydroxide (NaOH) : It is used for making soaps and detergents.
(ii) Use of Chlorine (Cl2) : It is used in the production of bleaching powder.
(iii) Use of hydrogen gas (H2) : It is used to make ammonia for fertilisers; used as a fuel or margarine.
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