Which of the following imparts purple colour to glass?
A
Cr2O3
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B
AuCl3
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C
Cu2O
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D
MnO2
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Solution
The correct option is CMnO2 MnO2 imparts purple colour to glass. Manganese dioxide, which is black, is used to remove the green color from the glass; in a very slow process this is converted to sodium permanganate, a dark purple compound.