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
(g) decomposes according to the equation
A sealed container contains 0.5 mol of gas at 100°C and 2 atm pressure. What would be the pressure in the container if the gas is decomposed completely according to the above equation and the temperature were maintained at 100°C –
(A) 0.5 atm
(B) 1.0 atm
(C) 2.0 atm
(D) 3.0 atm
A general form of equation of state for gases is PV=RT where V is the molar volume of the gas and A, B, C, ........... are constant for the gas. The values of A and B, if the gas obeys van der Waals' equation, are respectively.
(1)
(2)
(3)
(4)
The mean free path of gas A, with molecular diameter equal to 4 Å, contained in a vessel, at a pressure of torr, is 6990 cm. The vessel is evacuated and then filled with gas B, with molecular diameter, equal to 2 Å, at a pressure of torr, the temperature remaining the same. The mean free path of gas B will be
(A) 28 cm
(B) 280 cm
(C) 7 cm
(D) 14 cm
Which of the following curves does not represent Boyle's Law
(1)
(2) `
(3)
(4)
If the pressure of a given mass of gas is reduced to half and temperature is doubled simultaneously, the volume will be
(1) Same as before
(2) Twice as before
(3) Four time as before
(4) One fourth as before
The critical volume of a gas is . The radius of the molecule will be , in cm
1.
2.
3.
4.