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  • Which one of the following elemental forms is not present in the enamel of the teeth ?Option: 1 <img alt="\mathrm{Ca^{2+}}" src="https://entrancecorn

Which one of the following elemental forms is not present in the enamel of the teeth ?

Option: 1

\mathrm{Ca^{2+}}


Option: 2

\mathrm{P^{3+}}


Option: 3

\mathrm{F^{-}}


Option: 4

\mathrm{P^{5+}}


Answers (1)

best_answer

The enamel of teeth contains hydroxyapatite \mathrm{\left(3 \mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2} \cdot \mathrm{Ca}(\mathrm{OH})_{2}\right)} and fluorapatite \mathrm{\left(3 \mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2} \cdot \mathrm{CaF}_{2}\right)}

Thus, the species present in the enamel of teeth are \mathrm{Ca^{2+}}, \mathrm{P^{5+}} and \mathrm{F^{-}}.

 \mathrm{P^{3+}} is not present in enamel of teeth.

Hence, the correct answer is Option (2)

Posted by

Rishabh

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