The coordination compounds are of great importance. These compounds are widely present in the mineral, plant and animal worlds and are known to play many important functions in the area of analytical chemistry, metallurgy, biological systems, industry and medicine.
Which of the following reagents can be used for qualitative and quantitative analysis (based on colour reactions) as well as for estimation of hardness of water ?

Options

A. EDTA
B. DMG
C. `alpha-nitroso-beta-naphthol`
D. Cupron

Answer

A