Question

Fill appropriate terms in the blanks .
( white cement , soap, detergent , wearing of bones, tooth decay, hard, soft, Portland, fatty acid )

(a) The substance that helps water to remove dirt from the surface of materials is called ............... .

(b) Fluoride is used in toothpaste to prevent ................ .

(c) Soap is a salt of ............... and sodium hydroxide.

(d) Synthetic detergents can be used in .............. water as well .

(e) For construction purposes ............... cement is the most commonly used cement.

Answer 1

(a) The substance that helps water to remove dirt from the surface of materials is called detergent.

(b) Fluoride is used in toothpaste to prevent tooth decay.

(c) Soap is a salt of fatty acid and sodium hydroxide.

(d) Synthetic detergents can be used in hard water as well.

(e) For construction purposes Portland cement is the most commonly used cement.