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

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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

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Asked question is from Glass topic in section Glass, Lime, Clay Products & Bricks of Construction & Building Materials

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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.

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