+1 vote
ago in Construction & Building Materials by (188k points)
Which of the following substances is not used as a decolorizer in the manufacturing of glass?

(a) Potassium carbonate

(b) Antimony oxide

(c) Cobalt oxide

(d) Manganese dioxide

This question was addressed to me in an interview.

This intriguing question originated from Glass topic in chapter Glass, Lime, Clay Products & Bricks of Construction & Building Materials

1 Answer

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ago by (1.2m points)
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Best answer
Correct answer is (a) Potassium carbonate

To elaborate: Potassium carbonate is a raw material needed to manufacture potash-lime glass and potash-lead glass. Decolorizers are substances which are added to glass in addition to the raw materials in order to avoid any colouring effects due to the presence of iron compounds in the glass. Some of the examples of decolourisers are antimony oxide, manganese dioxide and cobalt oxide.

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