$P_4O_{10}$ reacts with $HNO_3$ to give:

Which one of the orders is correctly matched with the property mentioned against it?

In the following reaction,identify the nature of the products formed by the complete hydrolysis of $\underline{P}_4O_8$ at $R.T$:
$\underline{P}_4O_8 + H_2O \longrightarrow H_3PO_3 + H_3PO_4$

Which colorless gas has a smell like rotten fish?

Dilute nitric acid on reaction with $Ag$ liberates

$A$ nitrogen oxide that forms "in situ" when dilute $FeSO_4$ is treated with an aqueous solution of nitrate ion and then carefully adding conc. $H_2SO_4$ along the sides of the test tube, is