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Acids, Bases and Salts — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceAcids, Bases and Salts1 Mark
MCQ
Calcium phosphate is present in tooth enamel. Its nature is :
  • ✓
    Basic.
  • B
    Acidic.
  • C
    Neutral.
  • D
    Amphoteric.
✓

Answer

Correct option: A.
Basic.
Calcium phosphate $\mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2$ is salt of weak acid and strong base so it is a basic salt.
$3\text{Ca(OH)}_2\ \ +\ \ 2\text{H}_3\text{PO}_4\ \ \ \rightarrow\ \ \ \text{Ca}_3\text{(PO}_4)_2\ \ +\ \ 6\text{H}_2\text{O}$
$\text{Calcium}\ \ \ \ \ \ \ \ \ \ \text{Phosphoric}\ \ \ \ \ \ \ \ \ \ \text{Calcium}$
$\text{Hydroxide}\ \ \ \ \ \ \ \ \text{acid}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Phosphate}$

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