Question

write the formula of the compound of phosphorus which is obtained when conc.HNO3 oxidises p4?

Answer 1

Formula of the compound of phosphorus which is obtained when  

conc.HNO3 Oxidises P4 is:

H3PO4

Answer 2

The formula of the compound of phosphorus is $H_3PO_4$ it is obtained when conc.$HNO_3$ oxidises $p_4$.

Explanation:

• The $H_3PO_4$ compound is known as phosphoric acid.

• Phosphoric acid is made by the combination of 3 hydrogen atoms, 1 phosphorous atom and 4 oxygen atoms.

• It is obtained when concentrated $HNO_3$  oxidizes $p_4$.

• It is a strong acid. Mostly the phosphoric acid is an aqueous solution.

• And it is colorless, odorless when you smell it, and also non-volatile acid.
• Since phosphorus is areducing agent. Hence, it reduces $HNO_3$ to $NO_2$.

      $P_4 + 20HNO_3 \rightarrow 20NO_2 + 4H_3PO_4 + 4H_2O$

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