Oxalic acid dihydrate, $H_{2} C_{2} O_{4} \cdot 2 H_{2} O (s)$ is often used as a primary reagent to standardise sodium hydroxide solution. Which of these facts are reasons to choose this substance as a primary standard?
I. It is diprotic.
II. It is a stable compound that can be weighed directly in air.
III. It is available in pure form.

III only

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I and II only

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II and III only

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I, II and III

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Solution

The correct option is B II and III only
Oxalic acid ( $H_{2} C_{2} O_{4}$ ) is a diprotic acid as it has two replacable hydrogens and can not be weighed directly.But it is available in pure form.
So statements II and III are correct.

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The correct option is B II and III onlyOxalic acid (H2C2O4) is a diprotic acid as it has two replacable hydrogens and can not be weighed directly.But it is available in pure form.So statements II and III are correct.

The correct option is B II and III only
Oxalic acid ( $H_{2} C_{2} O_{4}$ ) is a diprotic acid as it has two replacable hydrogens and can not be weighed directly.But it is available in pure form.
So statements II and III are correct.