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JEE CHEMISTRY MCQ: HYDROGEN

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Which is not a water softener?
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Correct option: D
Na2SO4\mathrm{N}{\mathrm{a}_2}\mathrm{S}{\mathrm{O}_4}
Option D (Na2SO4\mathrm{N}{\mathrm{a}_2}\mathrm{S}{\mathrm{O}_4}) is correct because it is not used as a water softener, unlike Calgon, Permutit, and Na2CO3\mathrm{N}{\mathrm{a}_2}\mathrm{C}{\mathrm{O}_3}.

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