Question

Which of the following is not a use of baking soda?

• A. In medicines as antacid.
• B. As a component of baking powder.
• C. In removing permanent hardness of water.
• D. In fire extinguishers.

Answer 1

Answer: (C)

In removing permanent hardness of water.

Answer 2

: $Na_{2}CO_{3}$ (washing soda) is used for removing permanent hardness of water.