To purify fluorine gas,fumes of $HF$ are removed by

Compound $A$ and $B$ respectively are :-
$Cl_2 + 2NaOH (cold \& dil.) \rightarrow A + NaCl + H_2O$
$3Cl_2 + 6NaOH (hot \& conc.) \rightarrow B + 5NaCl + 3H_2O$

Chlorine is allowed to react with an excess of ammonia. In this reaction, $1$ mole of chlorine can oxidize '$Z$' moles of $NH_3$. The value of '$Z$' is:

When a mixture of solid $NaCl$ and solid $K_2Cr_2O_7$ is heated with concentrated $H_2SO_4$,orange-red vapours are evolved. These vapours are of which compound?

Which of the following halogens releases oxygen when passed through a hot concentrated solution of potassium hydroxide?

When $MnO_2$ and $H_2SO_4$ are added to $NaCl$,a greenish-yellow gas is evolved. Which gas is it?