Available chlorine in a good sample of bleaching powder is:

75%

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20-25%

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50-75%

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35-38%

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Solution

The correct option is D 35-38%
Amount of Chlorine obtained when a bleaching powder is treated with an excess of dilute acid is called available chlorine. In a good sample of bleaching powder available Chlorine is kept between 35-38 % (kept low). This is due to the following reasons:
-Bleaching powder decomposes When Kept in the air, hence available Chlorine is kept low.

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