If a gas expands at constant temperature indicates that

• kinetic energy of molecules decreases

• pressure of the gas increases

• kinetic energy of molecules remains as same

• number of the molecules of gas increase

In Fischer-Ringe's method of separation of nobles gas mixture from air, ......... is used

• 90% CaC₂ + 10% CaCl₂

• coconut charcol

• soda lime + potash solution

• 90% CaCO₃ + 10% urea

0.40 g of helium in a bulb at a temperature of T K had a pressure of p atm. When the bulb was immersed in water bath at temperature 50 K more than the first one, 0.08 g of gas had to be removed to restore the original pressure. T is

• 500 K

• 400 K

• 600 K

• 200 K

Given that the reduced temperature, $\mathrm{\theta } = \frac{\mathrm{T}}{{\mathrm{T}}_{\mathrm{C}}}$; the reduced pressure, $\mathrm{\pi } = \frac{\mathrm{F}}{{\mathrm{F}}_{\mathrm{C}}}$ and the reduced volume, $\mathrm{\varphi } = \frac{\mathrm{V}}{{\mathrm{V}}_{\mathrm{C}}}$ 

Thus, it can be said that the reduced equation of state may be given as

• $\left(\frac{\mathrm{\pi }}{3} + \frac{1}{\mathrm{\phi }}\right) \left(3\mathrm{\varphi } - 1\right) = \frac{8}{3} \mathrm{\theta }$

• $\left(\frac{\mathrm{\pi }}{4} + \frac{1}{\mathrm{\phi }}\right)\left(3\mathrm{\theta } - 1\right) = \frac{3}{8} \mathrm{\phi }$

• $\left(\frac{\mathrm{\pi }}{3} + \frac{1}{\mathrm{\phi }}\right)\left(\mathrm{\varphi } - 1\right) = \frac{3}{8} \mathrm{\theta }$

• $\left(\frac{\mathrm{\pi }}{3} + \frac{1}{{\mathrm{\phi }}^2}\right)\left(3\mathrm{\varphi } - 1\right) = \frac{8}{3} \mathrm{\theta }$

365.

The rate of a gaseous reaction is given by the expression k[A] [B]. If the volume of the reaction vessel is suddenly reduced to $\frac{1}{4}$ the initial volume, the reaction rate relating to original rate will be

• $\frac{1}{10}$

• $\frac{1}{8}$

• 8

• 16

56 g of nitrogen and 96 g of oxygen are mixed isothermally and at a total pressure of 10 atrn. The partial pressures of oxygen and nitrogen (in atm) are respectively

• 4, 6

• 5, 5

• 2, 8

• 6, 4

The density of a gas is found to be 1.56 g/L at 745 mm pressure and 65°C. What is the moleculer mass of the gas?

• 44.2 u

• 4.42 u

• 2.24 u

• 22.4 u

A gas mixture contains O₂ and N₂ in the ratio of 1 : 4 by weight. The ratio of their number of molecules is

• 1 : 8

• 1 : 4

• 3 : 16

• 7 : 32

The volume of a gas measured at 27$°$C and 1 atm pressure is 10 L. To reduce the volume to 2 L at 1 atm pressure, the temperature required is

• 60 K

• 75 K

• 150 K

• 225 K

4.5 g of aluminium (Atomic mass 27 amu) is deposited at cathode from Al³⁺ solution by a certain quantity of electric charge. The volume of hydrogen produced at STP from H⁺ ions in solution by the same quantity of electric charge will be

• 22.4 L

• 44.8 L

• 5.6 L

• 11.2 L