Match List-I with List-II and select the correct answer using the code

Match List-I with List-II and select the correct answer using the code given below the Lists :

List-I
(Compound)
List-II
(Use)
A. Bleaching powder 1. Removal of permanent hardness of water
B. Baking soda 2. Making toys
C. Washing soda 3. Ingredient in antacids
D. Plaster of Paris 4. Disinfecting drinking water
A-2, B-3, C-1, D-4
A-4, B-1, C-3, D-2
A-2, B-1, C-3, D-4
A-4, B-3, C-1, D-2
This question was previously asked in
UPSC Geoscientist – 2022
The correct answer is A-4, B-3, C-1, D-2.
Matching the compounds with their common uses.
Bleaching powder (Calcium hypochlorite) is used as a disinfectant for water (A-4). Baking soda (Sodium bicarbonate) is an ingredient in antacids due to its alkaline nature (B-3). Washing soda (Sodium carbonate) is used to precipitate calcium and magnesium ions, thus removing permanent hardness of water (C-1). Plaster of Paris (Calcium sulfate hemihydrate) hardens upon mixing with water and is used for making casts, statues, and toys (D-2).
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