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ICSE Class 9 Chemistry Question 26 of 34

The Language of Chemistry — Question 9

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9
Question

Question 1(ix)

In Ca3(PO4)x, the value of x is:

  1. 1
  2. 2
  3. 3
  4. 4
Answer

2

Reason — Chemical formula of calcium phosphate:

Ca2+ PO43−Ca222 ↙↘ PO43⇒Ca23 ↙↘PO422Ca3(PO4)2\text{Ca}^{2+} \space \text{PO}_4^{3-} \\[1em] \overset{\phantom{22}{2}}{\text{Ca}} \space {\swarrow}\mathllap{\searrow} \space \overset{3}{\text{PO}_4} \Rightarrow \underset{\phantom{2}{3}}{\text{Ca}} \space {\swarrow}\mathllap{\searrow} \underset{\phantom{2}{2}}{\text{PO}_4} \\[1em] \text{Ca}_3\text{(PO}_4)_2

∴ Chemical formula of calcium phosphate is Ca3(PO4)2 hence x = 2.