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

A. \({\mathrm{Na}}_{2}{\mathrm{Cr}}_{2}{\mathrm{O}}_{7}\)
B. Oxalic acid
C. \(\mathrm{NaOH}\)
D. \({\mathrm{FeSO}}_{4}\cdot 6{\mathrm{H}}_{2}\mathrm{O}\)
E. Sodium tetraborate

Choose the most appropriate answer from the options given below:

[JEE Main 2025, 3 Apr (Shift 2)]

Question

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

A. \({\mathrm{Na}}_{2}{\mathrm{Cr}}_{2}{\mathrm{O}}_{7}\)
B. Oxalic acid
C. \(\mathrm{NaOH}\)
D. \({\mathrm{FeSO}}_{4}\cdot 6{\mathrm{H}}_{2}\mathrm{O}\)
E. Sodium tetraborate

Choose the most appropriate answer from the options given below:

[JEE Main 2025, 3 Apr (Shift 2)]

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