Which one of the following is a primary standard? - Vidyadip

MCQ

Which one of the following is a primary standard?

A
Oxalic acid
B
Sodium thiosulphate
C
Sodium hydroxide
✓
Potassium dichromate

✓

Answer

Correct option: D.

Potassium dichromate

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 $(K_2Cr_2O_7)$ 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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