MCQ
Calcium phosphate is present in tooth enamel, its nature is:
- ABasic
- BAcidic
- CNeutral
- DNone of the above
Explanation:
Calcium phosphate is present in tooth enamel and it is known as hydroxyapatite which is basic in nature.
It is present in bones also. It is the hardest known material in the whole body.
It is present on the outside part of the crown area in a tooth.
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| Column A | Column B |
| (i) Ionic bond | (a) $\mathrm{NH}_{3}$ |
| (ii) Polar covalent bond | (b) $\mathrm{C}_{60}$ |
| (iii) Non-polar bond | (c) $\mathrm{N}_{2}$ |
| (iv) Fullerene | (d) NaCl |