MCQ
Which one of the following is a primary standard?
- AOxalic acid
- BSodium thiosulphate
- CSodium hydroxide
- DPotassium dichromate
✓
Answer
- Potassium dichromate
Explanation:
The primary standard is a compound of sufficient purity from which standard solutions of known normalities can be prepared by direct weighing of it and diluting to a defined volume of solution.
Potassium Dichromate(K2Cr2O7) is suitable to be used as a primary standard. It cannot be obtained in very pure form. It readily reacts with any traces of organic material or any other reducing substance in wate
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