None
The average speed of gas molecules in a gas present in equilibrium mixture is:
Nothing can be said.
Two blocks kept on the smooth horizontal surfaces of masses 7kg and 3kg connected with a light string are pulled by applying a horizontal force of 40N as shown in the figure. The tension force (in N) in the string is-

28
12N
21N
None of the above
The vapour density of N2O4 at a certain temperature is 30. Calculate the percentage dissociation of N2O4 at this temperature.
85.3%
63.6%
20%
53.3%