In which of the following is silica $(SiO_2)$ soluble?

The correct structure of tribromooctaoxide is

Find out which of the following statements are true or false:
$(a)$ Number of $S-S$ bonds in $H_2S_nO_6$ is $(n-1)$.
$(b)$ When $F_2$ reacts with $H_2O$,it forms $HF$,$O_2$,and $O_3$.
$(c)$ $XeF_6$ on hydrolysis shows a disproportionation reaction.
$(d)$ $Al$ metal on reacting with dilute $NaOH$ gives a white precipitate of $Al(OH)_3$ as a final product.

Explain the preparation of chlorine and describe the Deacon's process and electrolytic process for its production.

The mixture used for the tips of matchsticks is:

$O_2$ is formed in the hydrolysis of: