Q.

Which of the following imparts deep blue colour to glass?

A. Cobalt oxide
B. Cupric oxide
C. Ferrous oxide
D. Nickel oxide
Answer» D. Nickel oxide
Explanation: Glass colouring and colour marking may be obtained by addition of colouring ions, by precipitation of nanometer sized colloides (so-called striking glasses such as "ruby gold" or red "selenium ruby"), by coloured inclusions (as in milk glass and smoked glass).
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