States of Matter

For the following reaction in gaseous phase

CO (g) + $\frac{1}{2}$O₂ (g) → CO₂ (g) K_p/ K_c is

• (RT)^1/2

• (RT)^-1/2

• (RT)

• (RT)^-1

How many joules of heat are absorbed when 70.0 g of water is completely vaporised at its boiling point ?

• 23, 352

• 7,000

• 15,813

• 158, 130

Which of the following will increase with the increase in temperature ?

• Surface tension

• Viscosity

• Molality

• Vapour pressure

When a liquid that is immiscible with water was steam distilled at 95.2°C at a total pressure of 99.652 kPa. The distillate contained 1.27 g of the liquid per gram of water. What will be the molar mass of the liquid if the vapour pressure of water is 85.140 kPa at 95.2°C?

• 99.65 g mol^-1

• 18 g mol^-1

• 134.1 g mol^-1

• 105.74 g mol^-1

Which of the following type of forces are present in vulcanised rubber?

• Weakest intermolecular forces

• Hydrogen bonding

• Three dimensional network of bonds

• Metallic bonding

Match the following

The correct answer

• A-IV, B-III, C-I, D-II

• A-V, B-III, C-I, D-II

• A-V, B-III, C-II, D-I

• A-IV, B-III, C-II, D-I

The most probable speed of O₂, molecules at T(K) is

• $\sqrt{\frac{\mathrm{RT}}{4\mathrm{\pi }}}$

• $\sqrt{\frac{\mathrm{RT}}{16\mathrm{\pi }}}$

• $\sqrt{\frac{\mathrm{RT}}{16}}$

• $\sqrt{\frac{3\mathrm{RT}}{32}}$

If the kinetic energy in J, of CH₄ (molar mass =16 g mol^-1) at T(K) is X, the kinetic energy in J, of O₂, (molar mass = 32 g mol^-1) at the same temperature is

• X

• 2X

• X²

• X/2

The given figure shows the Maxwell distribution of molecular speeds of a gas at three different temperatures T_1,T_2, and T₃. The correct order of temperature is

• T₁ > T₂ > T₃

• T₁ > T₃ > T₂

• T₃ > T₂ > T₁

• T₂ > T₃ > T₁

At low pressure and high temperature, the van der Waal's equation is finally reduced (simplified) to

• $\left(\mathrm{p} + \frac{\mathrm{a}}{{\mathrm{V}}_{\mathrm{m}}^2}\right)({\mathrm{V}}_{\mathrm{m}} - \mathrm{b}) = \mathrm{RT}$

• $\mathrm{p}({\mathrm{V}}_{\mathrm{m}} - \mathrm{b}) = \mathrm{RT}$

• $\left(\mathrm{p} + \frac{\mathrm{a}}{{\mathrm{V}}_{\mathrm{m}}^2}\right){\mathrm{V}}_{\mathrm{m}} = \mathrm{RT}$

• pV_m = RT