Oxidation number of $Cl$ in $CaOCl_2$ (bleaching powder) is
- AZero,since it contains $Cl_2$
- B$-1$,since it contains $Cl^{-}$
- C$+1$,since it contains $ClO^{-}$
- D$+1$ and $-1$ since it contains $ClO^{-}$ and $Cl^{-}$
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