The product obtained when silica reacts with hydrogen fluoride is

State the electronic configurations of Group-$17$ elements.

Match the following interhalogen compounds with their corresponding physical properties:

Column-$I$	Column-$II$
$(a) IBr$	$(i)$ Orange solid
$(b) ClF_3$	$(ii)$ Yellow-green liquid
$(c) BrF_3$	$(iii)$ Black solid
$(d) ICl_3$	$(iv)$ Colorless gas

In the following reaction,identify the nature of the product formed by the complete hydrolysis of $BrF_5$ at $R.T.$:
$BrF_5 + 3H_2O \longrightarrow HBrO_3 + 5HF$

Which of the following acids is the most acidic?

Which of the following elements is in a liquid state at room temperature?