Question

Finely crushed quartz, once fired, produced faience; it was then coated with silica to
which copper oxide was added to give it a shiny glaze of
A. Greencolour
B. Redcolour
C. Orangecolour
D. Turquoisecolour​

Answer 1

Copper oxide was added to give it a shiny glaze of green color.

Option A

Explanation:

• Faience is nothing but a material of ceramic importance composed of quartz or glass.
• Quartz is mainly crystals of Silicon oxides, firing results in the formation of oxides of silica.
• This mixture ( coated silica and the oxides) when added to copper oxide in a finely divided state, it gives a lustrous nature.
• The shiny substance imparts light when it corresponds to the wavelength of green. So, the light is green in colour.

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