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Which of the following is treated with chlorine to obtain bleaching powder?

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Which of the following is treated with chlorine to obtain bleaching powder?
A. dilute solution of `Ca(OH)_2`
B. concentrated solution of `Ca(OH)_2`
C. dry CaO
D. dry slaked lime
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Correct Answer - D
Bleaching powder is prepared by passing chlorine gas over dry slaked lime `Ca(OH)_2` by Hesenclaver method or by Bachmann method .
`Ca(OH)_2+Cl_2 to CaOCl_2 + H_2O`
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