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B
Silicates of calcium and sodium
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C
Hydrated silicates of aluminium and sodium
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D
Silicates of calcium and magnesium
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Solution
The correct option is B Hydrated silicates of aluminium and sodium Permutit is the trade name of a mixture of hydrated silicates of Al and Na. Permutit or sodium aluminium silicate is a complex chemical compound. It is Na2Al2Si2O8.xH2O