With respect to calibration of uv-vis spectrophotometer, which of the following material is used to evaluate the ‘control of absorbance’
A. Sodium thiosulphate
B. Potassium dichromate
C. Holmium oxide
D. Potassium permanganate
A. Sodium thiosulphate
B. Potassium dichromate
C. Holmium oxide
D. Potassium permanganate