Which of the statements given below is correct? A. Iodometry is a method in which I2 solution is used as a titrant and substances that can reduce iodine to iodine can be determined. B. Starch indicator is added to the medium at the beginning of the titration. A. All metal salts other than alkali salts dissolved in water cause hardness. D. 1 German hardness is the hardness of water containing cation equivalent to 1 mg CaCO3 in 100 mL.

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