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

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in Construction & Building Materials by (189k points)
Which of the following is added to the glass in order to make its colour green?

(a) Cobalt oxide

(b) Magnesium dioxide

(c) Sodium oxide

(d) Chromium sesquioxide

The question was asked during an online exam.

I would like to ask this question from Glass in section Glass, Lime, Clay Products & Bricks of Construction & Building Materials

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