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  4. Ca ( OH )2 ( Cl 2/- H 2 O ) A stackrel text Auto Oxidation longrightarrow CaCl 2+ B Identify B in the above reaction:

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Q. $Ca ( OH )_{2} \frac{ Cl _{2}}{- H _{2} O } A \stackrel{\text { Auto Oxidation }}{\longrightarrow } CaCl _{2}+ B$
Identify $B$ in the above reaction:

The s-Block Elements

Solution:

Calcium hydroxide or slaked lime $[Ca (OH)_2 ]$ reacts with $Cl _{2}$ to give bleaching powder, $CaOCl _{2} .$ Bleaching power on auto-oxidation gives calcium chlorate, $\left[ Ca \left( ClO _{3}\right)_{2}\right]$

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