Flask X is filled with 20 g of gas at 100 °C and another identical flask Y with 40 g gas at the same temperature. The correct statement among the following is –
1. The pressure of the gases in the two flasks is identical
2. The pressure of in flask X is higher than that of in flask Y
3. The pressure of in flask X is lower than that of in flask Y
4. The pressure of in flask X is half that of in flask Y
A certain volume of argon gas (Mol. wt. = 40) requires 45 s to effuse through a hole at a certain pressure and temperature. The same volume of another gas of unknown molecular weight requires 60s to pass through the same hole under the same conditions of temperature and pressure. The molecular weight of the gas is
(1) 53
(2) 35
(3) 71
(4) 120
The rms speed of a gas molecules at temperature and pressure bar is cm/sec. If both temperature and pressure are raised three time, the rms speed of the gas will be
(A) cm/sec
(B) cm/sec
(C) cm/sec
(D) cm/sec
The rate of effusion of helium gas at a pressure of 1000 torr is 10 torr min–1 What will be the rate of effusion of hydrogen gas at a pressure of 2000 torr at the same temperature?
(A)
(B)
(C)
(D)
The van der waals' constants for a gas are : . lts Boyle temperature is roughly
(1)
(2)
(3)
(4)
Choose the correct statement for viscosity () variation with T and P for an ideal gas-
1. of a gas increases with increase in temperature (T), but it is independent of pressure
2. of a gas decreases with increase in T and increases with increase in P
3. of a gas is independent of temperature and pressure
4. of a gas increases with increase in both T and P
Since the atomic weights of C, N and O are 12, 14 and 16 respectively, among the following pair, the pair that will diffuse at the same rate is
(1) Carbon dioxide and nitrous oxide
(2) Carbon dioxide and nitrogen peroxide
(3) Carbon dioxide and carbon monoxide
(4) Nitrous oxide and nitrogen peroxide
Oxygen is present in 1-litre flask at a pressure of mmHg.The number of oxygen molecules in the flask at is -
1.
2.
3.
4.
The critical temperature and critical pressure of a gas obeying van der Waals’ equation are 30ºC and 73 atm respectively. Its van der Waals’ constant, b is, therefore
1. 0.500
2. 0.060
3. 0.265
4. 0.043
A closed vessel contains equal number of oxygen and hydrogen molecules. Consider the following statements:
1. The average speed of hydrogen molecules is greater.
2. The two gases have different average energies.
3. Hydrogen molecules strike the walls more often.
4. Weight of hydrogen is th of the weight of oxygen.
Wrong statements are –
(A) 1 and 2
(B) 2 and 3
(C) 1 and 3
(D) 2 and 4