Question

In which condition can real gas closely obey the ideal gas equation?

• A. pressure is very small and temperature is very high
• B. pressure is very high and temperature is very low
• C. both pressure and temperature are very high
• D. both pressure and temperature are very low

Answer 1

The correct option is A pressure is very small and temperature is very high

Real gas obeys van der Waals equation

$(p+\frac{n^{2}a}{V^2})(V-nb)=nRT$

At high temperature and low-pressure volume and pressure correction terms becomes negligible.

Hence Van der Waal equation becomes approximately PV=nRT

So gases behave ideally at high temperatures and low pressure.