NEET Practice Questions (MCQs) with Answers & Solutions

(c) These are facts about Loschmidt's number.

(a) V$\propto$1/P or density $\propto$P (^..^. d$\propto$1/V),Boyle's law 

(c) b = 4 x N x volume of one molecule in rest.

(a) Average kinetic energy, E = (3/2)RT

 u_rms = $\sqrt{\frac{3RT}{M}}$ = $\sqrt{\frac{2E}{M}}$

(a) According to Boyle's law,

           p₁V₁ = p₂V₂

          750 x 600 =p₂ x 500

                    p₂ = (750 x 600)/500 = 900 mm

   So, the increase in pressure = 900-750 =150 mm

(b) A real gas behave as an ideal gas at low pressure and high temperature.

(c) Ideal gas do not show change in temperature during expansion.

(c) The ideal gas equation is pV = nRT

where, V is the volume of n moles of a gas.

(c) SO₂ has higher value of vander Waals' forces of attraction and thus, more easily liquefied.

(a) The average translational kinetic energy of a gas molecule is $\frac{1}{2}$m$\overline{u}$² at a temperature T. The total energy of the whole of the gas containing N molecules is

                                 E_k = $\frac{1}{2}$mN$\overline{u}$²                      ....(i)

The kinetic gas equation is

                                    pV = $\frac{1}{3}$mN$\overline{u}$²                 .... (ii)

                                    pV = 2/3 x 1/2 mN$\overline{u}$²  

                                    pV =  $\frac{2}{3}$E_k

                                    p = $\frac{2}{3}$E_k per unit volume