The compressibility of gas is less than unity at S.T.P .Therefore

$(a)\;V_m > 22.4 l\qquad(b)\;V_m < 22.4 l\qquad(c)\;V_m = 22.4 l\qquad(d)\;V_m > 44.8 l$

$Z< 1$
Or $\large\frac{PV}{nRT} < 1$
Thus $V_m < 22.4 l$
Hence answer is (b)
answered Feb 13, 2014