CBSE
Multiple Choice QuestionsIf a gas expands at constant temperature indicates that
kinetic energy of molecules decreases
pressure of the gas increases
kinetic energy of molecules remains as same
number of the molecules of gas increase
A gas mixture contains O2 and N2 in the ratio of 1 : 4 by weight. The ratio of their number of molecules is
1 : 8
1 : 4
3 : 16
7 : 32
In Fischer-Ringe's method of separation of nobles gas mixture from air, ......... is used
90% CaC2 + 10% CaCl2
coconut charcol
soda lime + potash solution
90% CaCO3 + 10% urea
The density of a gas is found to be 1.56 g/L at 745 mm pressure and 65°C. What is the moleculer mass of the gas?
44.2 u
4.42 u
2.24 u
22.4 u
At 27°C, one mole of an ideal gas is compressed isothermally and reversibly from a pressure of 2 atm to 10 atm. Choose the correct option from the following
Change in internal energy is positive
Heat is negative
Work done is - 965.84 cal
All are incorrect
Given that the reduced temperature, ; the reduced pressure, and the reduced volume,
Thus, it can be said that the reduced equation of state may be given as
0.40 g of helium in a bulb at a temperature of T K had a pressure of p atm. When the bulb was immersed in water bath at temperature 50 K more than the first one, 0.08 g of gas had to be removed to restore the original pressure. T is
500 K
400 K
600 K
200 K
The volume of a gas measured at 27C and 1 atm pressure is 10 L. To reduce the volume to 2 L at 1 atm pressure, the temperature required is
60 K
75 K
150 K
225 K
The rate of a gaseous reaction is given by the expression k[A] [B]. If the volume of the reaction vessel is suddenly reduced to the initial volume, the reaction rate relating to original rate will be
8
16
56 g of nitrogen and 96 g of oxygen are mixed isothermally and at a total pressure of 10 atrn. The partial pressures of oxygen and nitrogen (in atm) are respectively
4, 6
5, 5
2, 8
6, 4
