Which of the following silver precipitates dissolves in $dil. \, HNO_3$ to produce a clear solution?

In the test for $SO_4^{2-}$,the white precipitate of sulfate is soluble in which of the following solutions?

Aqueous solution of a salt $(A)$ forms a dense white precipitate with $BaCl_{2}$ solution. The precipitate dissolves in dilute $HCl$ to produce a gas $(B)$ which decolourises acidified $KMnO_{4}$ solution. $A$ and $B$ respectively are

The phosphate radical reacts with ammonium molybdate to form a precipitate of which color?

Which of the following radicals does not liberate gas with ($Zn$ + dil. $HCl$) on warming?

On treating a compound with warm dil. $H_{2}SO_{4}$,gas $X$ is evolved which turns $K_{2}Cr_{2}O_{7}$ paper acidified with dil. $H_{2}SO_{4}$ to a green compound $Y$. $X$ and $Y$ respectively are