Q.) A salt is obtained using common salt as
a raw material. It is used in glass, soap
and paper industries and also used in the
manufacture of sodium compounds such as
borax.Identify the salt.
(a) Caustic soda (b) Bleaching powder
(c) Baking soda (d) Washing soda
Ans: (d) Washing soda
Explanation: Washing soda or Na2CO3.10H2O is obtained using common salt as a raw material. It is obtained by heating baking soda and recrystallisation of sodium carbonate gives washing soda. It is also a basic salt. Na2CO3 + 10H2O → Na2CO3.10H2O
