$1.387g$ of a sample containing KCl and $NH_4Cl$ is heated until constant weight.The residue is dissolved in 20ml of N/10 $AgNO_3$ solution.Calculate % of chlorine in mixture.

Question

$(a)\;71.2\%\qquad(b)\;73.2\%\qquad(c)\;61.2\%\qquad(d)\;64.31\%$