States of Matter

The ratio of rates of diffusion of gases X and Y is 1 : 5 and that of Y and Z is 1 : 6. The ratio of rates of diffusion of Z and X is

• 1:30

• 1:6

• 30:1

• 6:1

The vapour pressure decreases by 10 mm of Hg when mole fraction of solute in a solution is 0.2. If the vapour pressure decreases to 20 mm of Hg then the mole fraction of solute will be

• 0.2

• 0.4

• 0.6

• 0.8

Two gas cylinders having same capacity have been filled with 44 g of H₂ and 44 g of CO₂ respectively. If the pressure in CO₂ cylinder is 1 atmosphere at a particular temperature, the pressure in the hydrogen cylinder at the same temperature is 

• 2 atmosphere

• 1 atmosphere

• 22 atmosphere

• 44 atmosphere

Kinetic energy of one mole of an ideal gas at 300 Kin kJ is

• 3.74

• 348

• 34.8

• 3.48

25 g of each of the following gasses are taken at 27°C and 600 mm pressure. Which of these will have the least volume?

• HCl

• HBr

• HI

• HF

The statement that is not correct is

• A furnace filled with haemalite is used to convert cast iron to wrought iron

• Collectors enhance the wettability of mineral particles during froth flotation

• In vapour phase refining, metal should form a volatile compound

• Copper from its low grade ores is extracted by hydrometallurgy

Lowering of vapour pressure is highest for

• 0.1 M BaCl₂

• 0.1 M glucose

• 0.1 M MgSO₄

• Urea

Van der waals' real gas, acts as an ideal gas at which condition?

• High temperature, low pressure

• Low temperature, high pressure

• High temperature, high pressure

• Low temperature, low pressure