TS EAMCET · Chemistry · Coordination Compounds
The fluoride ions make the enamel of teeth much harder by converting, which of the following substance/compound
- A \(\left[3 \mathrm{Mg}_3\left(\mathrm{PO}_4\right)_2 \cdot \mathrm{Ca}(\mathrm{OH})_2\right]\)
- B \(\left[3 \mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2 \cdot \mathrm{Ca}(\mathrm{OH})_2\right]\)
- C \(\left[3 \mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2 \cdot \mathrm{CaF}_2\right]\)
- D \(\left[3 \mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2 \cdot \mathrm{MgCl}_2\right]\)
Answer & Solution
Correct Answer
(B) \(\left[3 \mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2 \cdot \mathrm{Ca}(\mathrm{OH})_2\right]\)
Step-by-step Solution
Detailed explanation
Teeth enamel contain \(\left[3 \mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2 \cdot \mathrm{Ca}(\mathrm{OH})_2\right]\) which on reacting with fluoride ion is converted into \(\left[3 \mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2 \cdot \mathrm{CaF}_2\right]\) much harder.
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