General Knowledge

Science & Technology

Medium

Recrystallization of sodium carbonate gives washing soda. Which of the following are the uses of washing soda?

(A) Manufacturing of borax

(B) Removing the permanent hardness of water

(C) Used in glass, soap and paper industries

(D) Used in soda-acid fire extinguishers

Choose the correct answer from the options given below:

(A), (B) and (D) only

(A), (C) and (D) only

(A), (B), (C) and (D)

(A), (B) and (C) only

✅ Correct Option: 4

Washing soda, $Na_2CO_3 \cdot 10H_2O$ , is used to make borax and other sodium compounds, to soften water by removing permanent hardness, and in the glass, soap and paper industries.

Soda-acid fire extinguishers use sodium bicarbonate, which is baking soda, not washing soda. Hence (A), (B) and (C) only.

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Match List-I with List-II

List-I	List-II
(Event)	(Year in which Launched)
(A) Air Quality Index	(I) 2010
(B) Ganga Action Plan	(II) 2014
(C) National Green Tribunal	(III) 1985
(D) Lifestyle for Environment movement	(IV) 2022

Choose the correct answer from the options given below:

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