A blue colour can be imparted to glass by use of:

F e_{2} O_{3}

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C o O

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N i O

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C u_{2} O

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Solution

The correct option is B $C o O$
To impart colour to the glass, a trace amount of transition metal oxide is added.
$C o O$ or $C u O$ gives blue colour to the Glass.
Hence B is correct option.

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F e_{2} O_{3}

C u O

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