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Coal and Its Types

gives blue co...

Question

_________ gives blue colour to the glass.

A

Cobalt oxide

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B

Ferrous oxide

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C

Manganese dioxide

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D

Chromium (III) oxide

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Solution

The correct option is A
Cobalt oxide

The ordinary soda-lime glass appears colourless. The iron oxide impurities present naturally in the silica gives it a green tinge but when different colouring ions are added, the colour of the glass changes. Cobalt oxide or cobalt carbonate, when added to the glass gives it a blue colour.

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Q. Question 11
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