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Question

If a glass is blue in colour, which additional compound does it contain?

A
Iron
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B
Chromium
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C
Cobalt
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D
Nickel
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Solution

The correct option is C Cobalt
The soda-lime glass is colourless. Compounds of certain metals are added to it to add colour. These mixtures are added to a molten mixture of glass. Cobalt compounds add blue colour to glass.

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