Question

When a liquid X is added to a grey powdery substance Y. The substance Y slowly sets into a hard mass. A thick paste of substance Y and sand made in liquid X is used for plastering the walls of houses. Answer the following-
a. What could the liquid X be?
b. Name the substance Y.

Answer 1

a. I think liquid X is water
b. Y is probably plaster of Paris

Answer 2

Answer: (a) Liquid X is water (b) Substance Y is cement.

Explanation:

Water is the liquid X which when added to the grey powdery substance that is cement, transforms it into a hard mass. By hydration process, cement reacts with water and slowly sets into a hard mass. A thick paste comprised of sand, cement, and water is created with this method which is used to plaster the walls of homes.

So liquid X is water and the substance Y is cement.

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