JEE Advanced Chemistry question
Some of the following reagents are used as primary standard. I: ; II: NaOH; III: ; IV: ; V: . Select the primary standard
Answer: (B)
Solution
A primary standard must be obtainable in a very pure, stable, non-hygroscopic form of precisely known composition. (I) is not a primary standard because its solutions are unstable/slowly decompose and it is difficult to obtain perfectly pure; NaOH
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