Ncert Exercises & Solutions

Match the compounds given in Column I with their uses mentioned in Column II.

Column I	Column II
A. CaCO₃	1. Dentistry, ornamental work
B. Ca(OH)₂	2. Manufacture of sodium carbonate from caustic soda
C. CaO	3. Manufacture of high-quality papers
D. CaSO₄	4. Used in whitewashing

Codes

Options:	A	B	C	D
1.	3	4	2	1
2.	1	2	3	4
3.	1	4	3	2
4.	4	1	3	2

Hint: Ca(OH)₂used in whitewashing

A. CaCO₃ is extensively used in the manufacture of high quality. It is also used as an antacid, mild abrasive in toothpaste, a constituent of chewing gum, and a filler in cosmetics.

B. Ca(OH)₂

\toIt is used in whitewash due to its disinfectant nature.

C. CaO

\toIt is used in the manufacture of sodium carbonate from caustic soda.

D. CaSO₄

\toIt is also employed in dentistry, in ornamental work, and for making casts of statues and busts.

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