Select the primary standard(s).

C e {(N O_{3})}_{4}

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A s_{2} O_{3}

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N a_{2} C_{2} O_{4}

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N a_{2} C O_{3}

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Solution

The correct options are
B $A s_{2} O_{3}$
C $N a_{2} C_{2} O_{4}$
A primary standard is a reagent that is extremely pure, stable, has no water of hydration and has a high molecular weight.
$A s_{2} O_{3}$ , $N a_{2} C_{2} O_{4}$ act as primary standard reagents.
$C e (N O_{3})_{4}$ , $N a_{2} C O_{3}$ are not primary standard reagents because they have less molecular weight and they can be hydrated.
Hence, options B and C are correct.

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