Three parts of $conc. HCl$ and one part of $conc. HNO_3$ are mixed to form aqua regia. It is used to dissolve:

In the following reactions,products $(A)$ and $(B)$,respectively,are:
$6 NaOH + 3 Cl_{2} \xrightarrow{\text{hot and conc.}} (A) + \text{side products}$
$2 Ca(OH)_{2} + 2 Cl_{2} \xrightarrow{\text{dry}} (B) + \text{side products}$

Chlorine gas is dried over

The anhydride of the oxoacid $HOCl$ is

Assertion $A$: $SF_6$ is highly stable.
Reason $R$: $SF_6$ is a gas.
The correct option among the following is:

Which of the following properties does not correspond to the order $HI < HBr < HCl < HF$?