A) Turmeric on filter paper
B) Silica gel coated with silver nitrate
C) potassium permanganate-sulphuric acid
D) Potassium dichromatic-sulphuric acid
A) Turmeric on filter paper
B) Silica gel coated with silver nitrate
C) potassium permanganate-sulphuric acid
D) Potassium dichromatic-sulphuric acid