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Q.

 The toughest material in the body is tooth enamel, which is composed of_________(a crystalline form of calcium phosphate). 

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a

Calcium chloride

b

Calcium Sulphite 

c

Calcium hydroxyapatite

d

Calcium Carbonate

answer is B.

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Detailed Solution

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The hardest material in the body is the enamel of the teeth, which is composed of calcium hydroxyapatite, a crystalline form of calcium phosphate. Instead of dissolving in water, it corrodes when the pH in the mouth is lower than 5.5.

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