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Hardness of Water:Causes, Types and Treatments

Which of the ...

Question

Which of the following is used to revive exhausted permutit?

A

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B

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C

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D

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Solution

The correct option is D

Exhausted permutit is $C a A l_{2} S i_{2} O_{8} . x H_{2} O$ , which when treated with $10 % N a C l$ solution, gives back permutit $N a_{2} A l_{2} S i_{2} O_{8} . x H_{2} O$

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