A) \[Ca{{(N{{O}_{3}})}_{2}}\]
B) \[C{{a}_{3}}{{(P{{O}_{4}})}_{2}}\]
C) \[Ca{{F}_{2}}\]
D) \[C{{a}_{3}}{{(B{{O}_{3}})}_{2}}\]
Correct Answer: B
Solution :
The chemical substance present in bones and teeth is calcium phosphate Ca3 (Po4)2. It is a compound of calcium, phosphorus and oxygen. It is responsible for hardness of bones and teeth. The enamel of teeth contains 91 percent of calcium phosphate and hence hardest part of the body.
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