Question

When orthophosphoric acid is heated to 600°C, the product formed is :-
(1) PH3
(2) P2O5
(3) H3PO3
(4) HPO3

Answer 1

Answer on Question#41367-Chemistry-Inorganic Chemistry

Question

When orthophosphoric acid is heated to $600^{\circ}\mathrm{C}$, the product formed is:

(1) $\mathrm{PH}_3$

(2) $\mathrm{P}_2\mathrm{O}_5$

(3) $\mathrm{H}_3\mathrm{PO}_3$

(4) $\mathrm{HPO}_3$

Answer

The correct answer is

(4) $\mathrm{HPO}_3$

When orthophosphoric acid is heated to $600^{\circ}\mathrm{C}$ it loses one molecule of water forming metaphosphoric acid by the following chemical equation

$$\mathrm{H}_3\mathrm{PO}_4 \rightarrow \mathrm{HPO}_3 + \mathrm{H}_2\mathrm{O}$$

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