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11. Which of the following is a property of primary standard substance? A) the substance should not be hygroscopic B) the substance should be reacted

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11. Which of the following is a property of primary standard substance? A) the substance should not be hygroscopic B) the substance should be reacted in a predictable way. C) the substance should have a high molar mass D) the substance should have a high degree of purity E) all the above are correct

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