Question : Which of the following metals is a constituent of Vitamin B12?
A. Cobalt
B. Zinc
C. Magnesium
D. Iron
Question Listed : Cobalt, Nutrition,
Question : Deep blue colour is imparted to glass by the presence of
A. iron oxide
B. cobalt oxide
C. nickel oxide
D. cupric oxide
Question Listed : Cobalt Oxide, Synthetic Material,