In the chromyl chloride test,the reagent used is

The solution of a chemical compound $X$ reacts with $AgNO_3$ solution to form a white precipitate of $Y$,which dissolves in $NH_4OH$ to give a complex $Z$. When $Z$ is treated with dilute $HNO_3$,$Y$ reappears. The chemical compound $X$ can be:

When $Cl_2$ water is added to a salt solution containing chloroform,the chloroform layer turns violet. The salt contains:

Which statement is not true with respect to the nitrate ion test?

$[X] + H_2SO_4 \to [Y]$ (a colourless gas with irritating smell).
$[Y] + K_2Cr_2O_7 + H_2SO_4 \to$ green solution.
$[X]$ and $[Y]$ are:

The incorrect statement in respect of the chromyl chloride test is: