Match the column – I with column – II

	Column  I		Column  II
a	Real gas at high pressure	p	$PV=RT+Pb$
b	Force of attraction among gas molecules is negligible	q	$PV=nRT$
c	At high temperature and low pressure	r	$Z=1$
d	Real gas at N.T.P.	s	$(P+\frac{a{n}^2}{V^2})(V-nb)=nRT$

 $(a-p)(b-p)(c-q,r)(d-s)$
At very high pressure, van der waal’s equation (for 1 mol gas) reduces to  $PV=RT+Pb$ . In this condition,attraction force among gas molecules will be negligible.
At high temperature and low pressure, real gases behave like ideal gas and obey $(PV=nRT)$. 

For ideal gases Z=1 
At normal temperature and pressure, the real gases obey van der waal’s equation of state, i.e.,  $(P+\frac{a{n}^2}{V^2})(V-nb)=nRT$