Practice free Kinetic Theory of Gases (Physics) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
At which one of the following temperature pressure conditions, the deviation of a gas from ideal behaviour is expected to be minimum?
(b) A real gas behave as an ideal gas at low pressure and high temperature.
An ideal gas expands according to PV=constant. On expansion, the temperature of gas:
(c) Ideal gas do not show change in temperature during expansion.
Select the correct statement. In the gas equation PV = nRT
(c) The ideal gas equation is pV = nRT
where, V is the volume of n moles of a gas.
If a gas expands at constant temperature, it indicates that
(c) KE =RT (for one mole of a gas)
As, the kinetic energy of a gaseous molecule depends only on temperature, thus at constant temperature, the kinetic energy of the molecules remains the same.
The condition of SATP refers for:
(d) SATP means 1 bar and 25 C .
Under what conditions will a pure sample of an ideal gas not only exhibit a pressure of 1 atm but also a concentration of 1 mol L-1? (R=0.082 L atm mol-1deg-1)
(c) According to ideal gas equation,
pV = nRT
p = RT
1 atm = 1 mol L-1 x 0.082 x T
T =1/0.082 = 12 K
The compressibility of a gas is less than unity at STP. Therefore:
(b) The compressibility factor (Z) = (Px22.4)/RT = 1 (for ideal gas)
(Z) = (P x Vm)/RT <1 (for real gas)
... 22.4/Vm > 1 or Vm < 22.4
The numberical value of cp -cv is equal to:
(b) Cp-Cv = R;
cp=M x Cp and cv = M x Cv
The van der Waals' equation for real gas is:
(d) These are van der Waals' equations for 1 mole (a) and n mole gas (b), (c).
How much should the pressure be increased in order to decrease the volume of a gas 5% at a constant temperature?
Applying Boyle's Law, P1V1=P2V2
Suppose initial pressure is P and initial volume is V, then
PV=P2 x 0.95V
P2=(p/0.95)=(100p/95)
Increase in pressure = (100P/95)-P=(5P/95)
% increase in pressure = {(5P/95)/P} x 100 = 500/95 = 5.26%
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