Give uses of $CO_{2}$.

In the following reaction,assign the state for the underlined atom for the product of complete hydrolysis at $R.T.$:
$\underline{N}O + H_2O \longrightarrow$ No reaction

The correct order of catenation is

When silicate units are linked together,they form which type of structures?

An inorganic compound $(A)$ made of the two most abundant elements in the Earth's crust is used in building construction. When $(A)$ reacts with carbon,it forms a poisonous gas $(B)$,which is a very stable diatomic molecule. Identify compounds $(A)$ and $(B)$.

Which of the following elements exists in the solid state at $25\,^oC$ temperature and atmospheric pressure?