Which of the following are primary standard?

Oxalic acid

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Potassium permanganate

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Potassium dichromate

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Sodium hydroxide

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Solution

The correct options are
A Oxalic acid
D Potassium dichromate
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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