The compounds with $s p^2$ hybridised central atom among the following are

(A) $\mathrm{H}_2 \mathrm{CO}_3$

(B) $\mathrm{SiF}_4$

(C) $\mathrm{BF}_3$

(D) $\mathrm{HClO}_2$

The hybridisation and shape of $I_3^{-}$ion, respectively, are

1 mole of a real gas is kept at high pressure of 100 bar at 300 K . If van der Waals' constant $b$ is $0.005 \mathrm{~L} / \mathrm{mol}$, what are the values of compressibility factor $Z$ of the gas and \% deviation of volume from ideality?

1 L closed flask contains a mixture of 4 g of methane and 4.4 g of carbon dioxide. The pressure inside the flask at $27^{\circ} \mathrm{C}$ is

[assume ideal behaviour of gases].