$0.05\;g$ of a commercial sample $KCl_3$ on decomposition liberated just sufficient oxygen for complete oxidation of $20\;ml\; CO$ at $27^{\large\circ}C$ and $750\;mm$ pressure.Calculate % of $KClO_3$ in sample.

Question

$(a)\;70.2\%\qquad(b)\;61.3\%\qquad(c)\;65.4\%\qquad(d)\;62.5\%$