Two vessels of volumes 16.4 L and 5 L contains two ideal gases of molecular existence at the respective temperature of 27°C and 227°C and exert 1.5 and 4.1 atm, respectively. The ratio of the number of molecules of the former to that of the later is

• 2

• 1

• $\frac{1}{2}$

• $\frac{1}{3}$

When 4 g of an ideal gas A is introduced into an evacuated flask kept at 25°C, the pressure is found to be one atmosphere. If 6 g of another ideal gas B is then added to the same flask, the pressure becomes 2 atm at the same temperature. The ratio of molecular weight (M_A : M_B) of the two gases would be

• 1 : 2

• 2 : 1

• 2 : 3

• 3 : 2

Identify an extensive property amongst the following.

• Viscosity

• Heat capacity

• Density

• Surface tension

The gas with the highest critical temperature is

• CO₂

• He

• N₂

• O₂

Intramolecular hydrogen bond is present in

• water

• o-nitrophenol

• p-nitrophenol

• methylamine

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

• 6,4

• 4,6

• 5,5

• 2,8

Hydration of different ions in aqueous solution is an example of

• ion-dipole interaction

• ion-induced dipole interaction

• dipole-dipole interaction

• dipole-induced dipole interaction

When a sample of gas is compressed at constant temperature from 15 atm to 60 atm, its volume changes from 76 cm³ to 20.50 m³. Which of the following  statements are possible explanations of this behaviour ?

1.The gas behaves non-ideally

2. The gas dimerises

3. The gas is adsorbed into the vessel walls

• 1, 2 and 3

• 1 and 2 only

• 2 and 3 only

• 1 only

The vapour pressure of two liquids X and Y are 80 and 60 Torr respectively. The total vapour pressure of the ideal solution obtained by mixing 3 moles of X and 2 moles of Y would be

• 68 Torr

• 140 Torr

• 48 Torr

• 72 Torr

70.

Two liquids X and Y form an ideal solution. The mixture has a vapour pressure of 400 mm at 300 K when mixed in the molar ratio of 1 : 1 and a vapour pressure of 350 mm when mixed in the molar ratio of 1 : 2 at the same temperature. The vapour pressures of the two pure liquids X and Y respectively are

• 550 mm, 250 mm

• 350 mm, 450 mm

• 350 mm, 700 mm

• 500 mm, 500 mm