Question:
The F$^-$ ions make the enamel on teeth much harder by converting hydroxyapatite (the enamel on the surface of teeth) into much harder fluoroapatite having the formula:
The F$^-$ ions make the enamel on teeth much harder by converting hydroxyapatite (the enamel on the surface of teeth) into much harder fluoroapatite having the formula:
Updated On: July 22, 2025
- [3(Ca$_3$(PO$_4$)$_2$).CaF$_2$]
- [3(Ca$_2$(PO$_4$)$_2$).Ca(OH)$_2$]
- [3(Ca$_3$(PO$_4$)$_3$.CaF$_2$]
- [3(Ca$_3$(PO$_4$)$_2$.Ca(OH)$_2$]
Hide Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Explanation:
- Hydroxyapatite, [Ca5(PO4)3(OH)], is present in tooth enamel.
- When fluoride ions (F−) are introduced, they replace the hydroxide ions (OH−), forming fluoroapatite:
Ca5(PO4)3(OH) + F− → Ca5(PO4)3F.
- Fluoroapatite has the molecular formula [3(Ca3(PO4)2·CaF2)], which is harder and more resistant to decay.
Final Answer: Option (1).
Was this answer helpful?
0
0
Top Questions on Chemistry in Everyday Life
- What is the pH of a 0.01 M solution of HCl?
- BITSAT - 2025
- Chemistry
- Chemistry in Everyday Life
- What are X and Y respectively in the following sets of reactions? (major product)
- AP EAPCET - 2025
- Chemistry
- Chemistry in Everyday Life
- Which of the following is not an antibiotic?
- AP EAPCET - 2025
- Chemistry
- Chemistry in Everyday Life
- Match the following polymers with their applications:
List-I (Polymer) List-II (Used in making) Polymer 1 Application 1 Polymer 2 Application 2 Polymer 3 Application 3 Polymer 4 Application 4 - AP EAPCET - 2025
- Chemistry
- Chemistry in Everyday Life
- The synthetic detergents of the following are
- AP EAPCET - 2025
- Chemistry
- Chemistry in Everyday Life
View More Questions
Questions Asked in JEE Main exam
- The value of current \( I \) in the electrical circuit as given below, when the potential at \( A \) is equal to the potential at \( B \), will be ________________________ A.
- JEE Main - 2025
- Electrical Circuits
- Let \( M \) denote the set of all real matrices of order 3 x 3 and let \( S = \{-3, -2, -1, 1, 2\} \). Let
\( S_1 = \{A = [a_{ij}] \in M : A = A^T \text{ and } a_{ij} \in S, \forall i, j\} \),
\( S_2 = \{A = [a_{ij}] \in M : A = -A^T \text{ and } a_{ij} \in S, \forall i, j\} \),
\( S_3 = \{A = [a_{ij}] \in M : a_{11} + a_{22} + a_{33} = 0 \text{ and } a_{ij} \in S, \forall i, j\} \).
If \(n(S_1 \cup S_2 \cup S_3) = 125\), then \( \alpha \) equals:- JEE Main - 2025
- Linear Algebra
Let a line passing through the point $ (4,1,0) $ intersect the line $ L_1: \frac{x - 1}{2} = \frac{y - 2}{3} = \frac{z - 3}{4} $ at the point $ A(\alpha, \beta, \gamma) $ and the line $ L_2: x - 6 = y = -z + 4 $ at the point $ B(a, b, c) $. Then $ \begin{vmatrix} 1 & 0 & 1 \\ \alpha & \beta & \gamma \\ a & b & c \end{vmatrix} \text{ is equal to} $
- JEE Main - 2025
- 3D Geometry
- Using the principal values of the inverse trigonometric functions the sum of the maximum and the minimum values of \(16((sec^{-1}x)^{2}+(cosec^{-1}x)^{2})\) is:
- JEE Main - 2025
- Inverse Trigonometric Functions
- If \( \alpha + i\beta \) and \( \gamma + i\delta \) are the roots of the equation \( x^2 - (3-2i)x - (2i-2) = 0 \), \( i = \sqrt{-1} \), then \( \alpha\gamma + \beta\delta \) is equal to:
- JEE Main - 2025
- Complex numbers
View More Questions
JEE Main Notification
GMC Azamgarh Admission 2025: Dates, Courses, Fees, Eligibility, SelectJuly 22, 2025GMC Azamgarh Admission 2025