SAMPLE QUESTION PAPER 4

Write chemical properties of alkenes.

Why are the gases helium and hydrogen not liquefied at room temperature by applying very high pressure?

$1 \mathrm{mole}$ of sulphur dioxide occupies a volume of $350 \mathrm{mL}$ at $27°\mathrm{C}$ and $5\times {10}^6 \mathrm{Pa}$ pressure. Calculate the compressibility factor of the gas. Is it less or more compressible than an ideal gas?

Compressibility factor, $\mathrm{Z}$ of a gas is given as, $\mathrm{Z}=\frac{\mathrm{pV}}{\mathrm{nRT}}$ What is the value of $\mathrm{Z}$ for an ideal gas?

Compressibility factor, $\mathrm{Z}$ of a gas is given as, $\mathrm{Z}=\frac{\mathrm{pV}}{\mathrm{nRT}}$. For real gas what will be the effect on value of $\mathrm{Z}$ above Boyle's temperature?

Assuming ${\mathrm{CO}}_2$ to be van der Waals' gas, calculate its Boyle temperature. Given $\mathrm{a}=3.59 {\mathrm{L}}^2 \mathrm{atm} {\mathrm{mol}}^{-2}$ and $\mathrm{b}=0.0427 \mathrm{L} {\mathrm{mol}}^{-1}$.

Boron fluoride exists as ${\mathrm{BF}}_3$ but boron hydride doesn't exist as ${\mathrm{BH}}_3$. Given reason. In which form does it exist? Explain its structure.

What are electron deficient compounds? Are ${\mathrm{BCl}}_3$ and ${\mathrm{SiCl}}_4$ electron deficient species? Explain.