(c) Bleaching action of bleaching powder is due to $Cl_{2},$ it liberate with dilute acids or even $CO_{2}.$ $\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ CaOCl_{2} + CO_{2}\ \rightarrow CaCO_{3} + Cl_{2}$
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.