CBSE
Multiple Choice QuestionsBy what factor does the average velocity of a gaseous molecule increase when the temperature (in kelvin) is doubled?
2.8
4.0
1.4
1.4
Dipole-induced dipole interactions are present in which of the following pair?
H2O and alcohol
Cl2 and CCl4
HCl and He atoms
HCl and He atoms
A gaseous mixture was prepared by taking equal moles of CO and N2, If the total pressure of the mixture was found 1 atmosphere, the partial pressure of the nitrogen (N2) in the mixture is
0.8 atm
0.9 atm
1 atm
0.5 atm
Two gases A and B having the same volume diffuse through a porous partition in 20 and 10 seconds respectively. The molecular mass of A is 49u. Molecular mass of B will be
12.25 u
6.50 u
25.00 u
25.00 u
If x is the amount of adsorbate and m is the amount of adsorbent, which of the following relations is not related to adsorption process?
p = f(T) at constant (x/m)
50 mL of each gas A and of gas B takes 150 and 200 s respectively for effusing through a pin hole under the similar conditions. If molecular mass of gas B is 36, the molecular mass of gas A will be
96
128
20.2
20.2
pA and pB are the vapour pressure of pure liquid components, A and B, respectively of and ideal binary solution. If xA represents the mole fraction of component A, the total pressure of the solution will be
pA + xA(pB-pA)
pA + xA(pA-pB)
pB + xA(pB-pA)
pB + xA(pB-pA)
Equal volumes of two monoatomic gases, A and B, at same temperature and pressure are mixed. The ratio of specific heats (Cp/Cv) of the mixture will be
0.83
1.50
3.3
3.3
For real gases van der Waal's equation is written as,
where, a and b are van der Waal's constants.
Two sets of gases are
I. O2, CO2, H2 and He
II. CH4, O2, and H2
The gases given in set- I increasing order of 'b' and gases given in set -II in decreasing order of 'a' are arranged below. Select the correct order from the following.
(I) He < H2 < CO2 < O2
(II) CH4> H2> O2
(I) O2 < He < H2 < CO2
(II) H2> O2 > CH4
(I) O2 < He < O2 < CO2
(II) CH4 > O2 > H2
(I) O2 < He < O2 < CO2
(II) CH4 > O2 > H2
A certain gas takes three times as long to effuse out as helium. Its molecular mass will be
27 u
36 u
64 u
64 u
