165) 4 gm of argon in a bulb at a temperature of T K, had a pressure P atm. When the bulb was placed in hotter bath at a temperature 50^o more than the first one, 0.8 gm of gas had to be removed to get the original pressure. T is equal to:

166) The vapour pressure of water at 20^oC is 17.5 torr. What will be the number of moles of water present in 1 L of air at 20^oC and 40% relative humidity?

167) 1 mol each of a monoatmoic, diatomic and triatomic gases are mixed. C_p⁄C_v for the mixture is:

168) An LPG cylinder contains 15 kg of butane gas at 27^oC and 10 atm pressure. It was leaking and its pressure fell down to 8 atm after 1 day. The gas leaked in 5 days is:

169) Oxygen gas is collected by downward displacement of water in a jar. The level of water inside the jar is adjusted to the height of water outside the jar. When the adjustment is made, the pressure exerted by oxygen is equal to: