Editor
Which of the following is the formula of bleaching powder?
Difficulty: Easy
A: 
$\rm{Ca(ClO)_{2}}$
B: 
$\rm{Ca(Cl_{2}O)_{2}}$
C: 
$\rm{Ca(ClO)_{4}}$
D: 
$\rm{Ca_{2}(ClO)_{2}}$
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