Which one of the following elemental forms is not present in the enamel of the teeth?
Show Hint
- \(\mathrm{Ca^{2+}}\)
- \(\mathrm{P^{3+}}\)
- \(\mathrm{F^{-}}\)
- \(\mathrm{P^{5+}}\)
The Correct Option is B
Solution and Explanation
Ions present: \(\mathrm{Ca^{2+}}\) (calcium), \(\mathrm{F^-}\) (fluoride) and phosphorus as \(\mathrm{PO_4^{3-}}\), in which P is in the +5 state (\(x + 4(-2) = -3 \Rightarrow x = +5\)).
Phosphorus in the +3 state is not present in the enamel.
Answer: (2) \(\mathrm{P^{3+}}\)
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