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Whch one of the following substances is ...

Whch one of the following substances is used to reactivate the de activated filters in activated carbon method for defluoridation ?

A

Defluoron - 1

B

`CaOCl_2` lime and alum

C

4% NaOH soluion and then 1% `H_3PO_4` solution

D

4% NaCl solution and then 5% `H_2SO_4` solution.

Text Solution

Verified by Experts

The correct Answer is:
C
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