What is produced when bleaching powder reacts with dilute hydrochloric acid?

An inorganic white crystalline compound $(A)$ has a rock salt structure. $(A)$ on reaction with conc. $H_2SO_4$ and $MnO_2$ evolves a pungent smelling,greenish-yellow gas $(B)$. Compound $(A)$ gives a white precipitate of $(C)$ with $AgNO_3$ solution. Compounds $(A)$,$(B)$,and $(C)$ will be respectively:

Hydrofluoric acid $(HF)$ cannot be stored in glass bottles because it reacts with glass $(SiO_2)$ to form:

In which of the following is gold soluble?

$Br_2 + F_2$ (Excess) $\xrightarrow{\Delta} BrF_5$. When $F_2$ is diluted with $N_2$ gas,then the product of $Br$ would be:

The mixture of conc. $HCl$ and potassium chlorate on heating gives