AP EAMCET · Chemistry · Environmental Chemistry

The main constituent of enamel on the surface of teeth is:

A $[3 {Ca}_{3} {({PO}_{4})}_{2} \cdot {CaF}_{2}]$
B ${Ca}_{3} {({PO}_{4})}_{2} \cdot H_{2} O$
C $[3 {Ca}_{3} {({PO}_{4})}_{2} \cdot Ca (OH)_{2}]$
D ${CaF}_{2}$

Verified Solution

Answer & Solution

Correct Answer

(D) ${CaF}_{2}$

Step-by-step Solution

Detailed explanation

Enamel provides the hard surface to the teeth. It has the carbonate substituted hydroxyapatite crystallites. It is formed from the minerals. It has the calcium phosphate and calcium hydroxide. Hence, the main constituent of enamel on the surface of teeth is 3Ca3PO42·Ca(OH)2.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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