raju needs hard water to perform an experiment in his laboratory but it is not avilable on particular day. there are some salts in the laboratory which dissolved in water can convert it into hard water
(a) sodium chloride and potassium chloride
(b) sodium sulphate and potassium sulphate
(c) sodium sulphate and calcium sulphate
(d) calcium sulphate and calcium chloride
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Sodium sulphate and potassium sulphate.
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