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Which of the following are primary standards?
I. Oxalic acid II. Potassium permanganate III. Potassium dichromate IV. Sodium hydroxide

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I and II

I and III

I and IV

I, II, III and IV

answer is B.

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Detailed Solution

A primary standard is a reagent that is extremely pure, stable, has no water of hydration and has a high molecular weight.
Some primary standards are sodium carbonate, potassium hydrogen iodate, potassium dichromate, oxalic acid etc.

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