Ncert Exercises & Solutions

Several sodium compounds find use in industries. Which of the following compounds are used in the textile industry?

a. ${Na}_{2} {CO}_{3}$

b. ${NaHCO}_{3}$

c. $NaOH$

d. $NaCl$

Choose the correct option
1. (a, c)
2. (b, c)
3. (c, d)
4. (a, d)

Hint: Hydroxide and carbonate of sodium used in the textile industry

NaOH is used in the manufacture of soap, paper, artificial silk and several chemicals, in petroleum refining, in the purification of bauxite, in the textile industries for the mercerisation of cotton fabrics. NaOH is also used in manufacture of rayon.

{Na}_{2} {CO}_{3}

is used in manufacture of soap powders, in laundry for washing.

Soda ash changes the pH of the fibre-reactive dye and cellulose fibre so that the dye reacts with the fibre, making a permanent attachment that holds the dye to the fibre.

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