Borax
Question
The colour imparted by Co(II) compounds to glass is
Moderate
Solution
Glass is an amorphous and transparent solid obtained by solidification of a mixture of silicates of different metals
One of which is an alkali metal
Addition of small amounts of transition metal salts to the glass mixture imparts colour to the glass
For example, addition of small amounts of Fe+3 , Fe+2 , Co+2 , Cr+3 and Mn+4 salts imparts
Yellow-brown , light blue , deep blue , green or violet colour respectively
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