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The reagent commonly used to determine hardness of water titrimetrically is `:`

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The reagent commonly used to determine hardness of water titrimetrically is `:`
A. oxalic acid
B. sodium thiosulphate
C. disodium salt of EDTA
D. sodium citrate.
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Correct Answer - C
Disodium salt EDTA is used to determine halogens of water titrimatrically.
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