why do bleaching powder gave smell of chlorine?

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$B l e a c h i n g p o w d e r i s C a O C l_{2} . W h e n e x p o s e d t o a i r, b l e a c h i n g p o w d e r g i v e s a s m e l l o f c h l o r i n e . T h i s i s b e c a u s e b l e a c h i n g p o w d e r r e a c t s w i t h c a r b o n d i o x i d e f r o m t h e a t m o s p h e r e t o p r o d u c e c a l c i u m c a r b o n a t e a n d c h l o r i n e g a s . T h e R e a c t i o n i s : C a O C l_{2} + C O_{2} \to C a C O_{3} + C l_{2} T h e c h l o r i n e e v o l v e d i s r e s p o n s i b l e f o r t h e s m e l l$
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