What type of oxide is $H_{2}O$?

What is the molecular formula of cryolite?

$A$ metal $M$ forms an oxide having the formula $M_{2}O_{3}$. It dissolves in both dilute sulphuric acid and dilute sodium hydroxide solution. Identify the metal and write the chemical equations for the reactions involved.

Pavan separates some materials into two groups and notes their properties. These properties are given in the table below:

Group $1$	Group $2$
They cannot be beaten into sheets.	They can be beaten into sheets.
When one end is in contact with a hot object,the other end does not get hot quickly.	When one end is in contact with a hot object,the other end gets hot quickly.
They cannot be drawn into thin wires.	They can be drawn into thin wires.

Which of the following statements cannot be false?

Give one most suitable word for the following statements.
$(a)$ Metal oxides which show basic as well as acidic behaviour.
$(b)$ Iodine,a non-metal is shining.

What is used as a catalyst in the production of sulfuric acid by the contact process?