CBSE
Multiple Choice QuestionsThe density of a gas A is thrice that of a gas B at the same temperature. The molecular weight of gas B is twice that of A. What will be the ratio of the pressures acting on B and A?
Assertion : Critical temperature of CO2 is 304 K, it cannot be liquified above 304 K.
Reason : At a certain temperature, volume
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false.
If both assertion and reason are false.
A 25 W bulb emits monochromatic yellow light of wavelength of 0.57 m. Calculate the rate of emission of quanta per second.
7.169 x 1019
4.569 x 1019
8.579 x 1019
9.662 x 1019
10 ml of liquid carbon disulphide (specific gravity 2.63) is burnt in oxygen. Find the volume of the resulting gases measured at STP.
23.25 L
22.26 L
23.50 L
20.08 L
Nitrogen (N2) is in equilibrium state at T = 421K. The value of most probable speed Vmp is:
400 m/s
421 m/s
500 m/s
600 m/s
1 mol of O2 and x mol of Ne in a 10 L flask at constant temperature exert a pressure of 10 atm. If partial pressure of O2 is 2 atm , moles of Ne in the mixture is :
1
2
4
3
A 1 L flask contains 32 g O2 gas at 27C. What mass of O2 must be released to reduce the pressure in the flask to 12.315 atm?
8 g
16 g
24 g
32 g
An evacuated glass vessel weighs 50 g when empty, 144.0 g when filled with a liquid of density 0.47 g mL-1 and 50.5 g when filled with an ideal gas at 760 mm Hg and 300 K. The molar mass of the ideal gas is :
[R = 0.0821 L atm K-1 mol-1]
61.575
130.98
123.75
47.87
Which of the following, is not a unit of pressure?
Atmosphere
Torr
Pascal
Newton
0.5 mole of each of H2 , SO2 and CH4 are kept in a container. A hole was made in the container . After 3h , the order of partial pressures in the container will be :
pSO2 > pH2 > pCH4
pSO2 > PCH4 > pH2
pH2 > pSO2 > pCH4
pH2 > pCH4 > pSO2
