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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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