Which pair of metals does not dissolve in nitric acid?

Sodium nitrite is reacted with $H_2SO_4$ to form $NaHSO_4$,$HNO_3$,water and $X$. Gold is dissolved in aqua regia to form water,$AuCl_4^{-}$ and $Y$. $X$ and $Y$ are respectively

Which of the following properties of white phosphorus are shared by red phosphorus?

The reaction of $HNO_3$ with $P_4O_{10}$ produces ....

In the following reaction,identify the nature of the product formed by the complete hydrolysis of the underlined atom at $R.T.$:
$\underline{P}Cl_5 + H_2O \longrightarrow H_3PO_4 + HCl$

Dilute nitric acid on reaction with $Ag$ liberates