Multiple choice

The presence of which of the following oxides imparts deep blue colour to glass?

  1. Cupric oxide

  2. Iron oxide

  3. Cobalt oxide

  4. Nickel oxide
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cobalt oxide is widely used in glassmaking to impart a deep, rich blue color, often known as cobalt blue. Cupric oxide typically gives green or blue-green hues, while iron oxide gives green or brown tones.

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