Question

Which of the following is added to the glass in order to make its colour violet?

(a) Ferric oxide

(b) Manganese dioxide

(c) Tin oxide

(d) Copper oxide

Answer 1

Correct option is (b) Manganese dioxide

Easiest explanation: Colouring pigments are added to the raw materials while manufacturing of the glass in order to make coloured glass. Manganese dioxide is added to the glass in order to make its colour violet.