Page 1 :
Ch-12, KTG, 3-MARKER QUESTION, Q1. Why temperature less than absolute zero is not possible?, Name three gas laws that can be obtained from the gas equation., , Q2. There are n molecules of a gas in a container. If the number of molecules is, increased to 2n, what will be:, (a) the pressure of the gas., (b) the total energy of the gas., (c) r.m.s. speed of the gas molecules., Q3. State law of equipartition of energy., Q4. Tell the Cp, Cv and degree of freedom of:, (a) Monoatomic gas moles., (b) Diatomic gas moles., (c) Polyatomic gas moles., Q5. The temperature of the gas in Kelvin is made 9 times. How does it affect the total, K.E., average K.E., r.m.s? velocity and pressure?, OR, Derive gas laws from the kinetic theory of gases., , Numerical Problems:, Q6. Calculate r.m.s. the velocity of hydrogen at N.T.P. Given the density of hydrogen =, 0.09 kg m4., Q7. Calculate the temperature at which r.m.s. the velocity of the gas molecule is double, its value at 27°C, the pressure of the gas remaining the same., Q8. Calculate the K.E./mole of a gas at N.T.P. Density of gas at N.T.P. =, 0.178 g dm-3 and molecular weight = 4.

Page 2 :
Q9. Gas at 27°C ¡n a cylinder has a volume of 4 litres and pressure 1oo Nm2., (a) Gas is first compressed at a constant temperature so that the pressure is 150 Nm 2., Calculate the change in volume., (b) It is then heated at a constant volume so that temperature becomes 127°C., Calculate the new pressure., Q10. Find the temperature at which the RMS velocity of oxygen molecules in the earth’s, atmosphere equals the velocity of escape from the earth’s gravitational field. (V.ImP), Q11. Derive pressure exerted by gas on walls of container.