RRB Group D Model Paper 10 with solutions

Question : 3 of 100

Marks: +1, -0

Adding which substance gives green colour to glass?

Calcium oxide
Iron oxide
Chromium oxide
Manganese oxide

Solution:

(3) Chromium (III) oxide is the inorganic compound of the formula

Cr_2O_3

. It is one of the principal oxides of chromium and is used as a pigment. In nature, it occurs as the rare mineral eskolaite. Chromium Oxide Green, also known as chromium sesquioxide or chromia, is one of four oxides of chromium. It is commonly called chrome green when used as a pigment. When it is added to glass it gives green colour to the glass.

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