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
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
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
A.
High temperature, low pressure
At higher temperature and low pressure real gas acts as an ideal gas and obey pV = nRT relation.