Compounds that should not be used as primary standards in titrimetric analysis are:

A. B. Oxalic acid C. D. E. Sodium tetraborate

Choose the most appropriate answer from the options given bel

Question

Compounds that should not be used as primary standards in titrimetric analysis are:

A.   B. Oxalic acid  C.   D.   E. Sodium tetraborate

Choose the most appropriate answer from the options given below:

Canvas Classes · Accepted Answer

Strategy:
 A primary standard must be highly stable, non-hygroscopic, and easy to weigh accurately with high purity. Substances that absorb moisture or Carbon Dioxide from the air, or are easily oxidized, are unsuitable.

Step 1: Evaluate each compound
- (A) : Unlike Potassium Dichromate, the Sodium salt is hygroscopic and therefore unsuitable as a primary standard.
- (B) Oxalic acid: Highly stable and pure in crystalline form. Suitable.
- (C) : Highly hygroscopic and absorbs  from the atmospher

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