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The permissible available chlorine in tr...

The permissible available chlorine in treated water should be `0.25 mg L^(-1)`. Bleaching powder to be added into `1000L` tank for the permissible chlorine should be

A

`0.45g`

B

`0.25g`

C

`45.0g`

D

`4.50g`

Text Solution

Verified by Experts

The correct Answer is:
A
Avilable chlorine is due to bleaching powder.
`underset(127g)(CaOCl_(2))+H_(2)O Rarr Caunderset(71g)((OH)_(2))+Cl_(2)`
`0.25mgL^(-1)`
`0.25 g//1000L`
`Cl_(2)` requried in `1000L` tank = `0.25xx1000`
`=250g`
`=0.25mg`
`71 g ` of `Cl_(2)` is from `= 127g CaOCl_(2)`
`0.25g` of `Cl_(2)` is from `=(127xx0.25)/(71) = 0.45g`.
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A2Z-ENVIRONMENTAL CHEMISTRY-Section D - Chapter End Test
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