The chemical formula for the phosphorus molecule is:

Which of the following is a neutral oxide?

On heating,compound $(A)$ gives a gas $(B)$ which is a constituent of air. This gas,when treated with $H_{2}$ in the presence of a catalyst,gives another gas $(C)$ which is basic in nature. $(A)$ should not be:

In group $15$ of the periodic table,nitrogen forms only a trihalide,but other elements form pentahalides also. The reason is:

Which of the following oxides is paramagnetic?

Cyclic polymetaphosphates have the general formula of $[P_nO_{3n}]^{n-}$. Cyclic trimeric polymetaphosphate $(P_3O_9)^{3-}$ has commercial importance. Which of the following is not true regarding $P_3O_9^{3-}$?