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option C is correct answer. most blue glasses are made up of either cobalt oxide or copper oxide. here from option we can take CuO as a right option.
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Answer: right answer is cuo
option (c)
Explanation: Cobalt glass—known as "smalt" when ground as a pigment—is a deep blue colored glass prepared by including a cobalt compound, typically cobalt oxide or cobalt carbonate, in a glass melt.
deepanshu888:
your explanation is not relavent to the option, as you are taking about cobalt but in answer its copper. check before posting an answer. No offence just to make you informed.
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