Question

Which of the following pair of salts used in Soda-Acid fire extinguisher and removing permanent hardness of water i) Sodium bicarbonate ii) Calcium oxy chloride iii) Calcium sulphate hemihydrate iv) Sodium carbonate

a) (i) and (ii)

b) (ii) and (iii)

c) (iii) and (iv)

d) (i) and (iv)​

Answer 1

option d......

sodium bicarbonate and sodium carbonate used to remove permanent hardness of water

Answer 2

Answer:

d) (i) and (ii)

Explanation:

sodium bicarbonate and sodium carbonate used to remove permanent hardness of water

Sodium Carbonate or Washing Soda ($Na_{2}$$CO_{3}.10H_2O$)

• Used as cleansing agent

• Used for removing permanent hardness of water

Baking Soda or Sodium Bi-carbonate (NaHCO3).

• Used as neutralising agent (antacid)

• Used for making baking powder.

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