In the reaction $4HNO_3 + P_4O_{10} \to 4HPO_3 + x$,the product $x$ is

$Sn$ is dissolved in excess of $NaOH$ solution,the compound obtained is

Which of the following oxy acids of phosphorus is a reducing agent and monobasic?

Give the preparation of phosphorus trichloride and phosphorus pentachloride.

Nitric acid forms an oxide of nitrogen on reaction with $P_{4}O_{10}$. Write the reaction involved. Also,write the resonating structures of the oxide of nitrogen formed.

On heating ammonium dichromate,the gas evolved is