1.

Which pair of the compound and coloured cement mentioned below is wrong?(a) Iron oxide-yellow(b) Cobalt-black(c) Chromium oxide-green(d) Manganese dioxide-brown

Answer» Correct option is (b) Cobalt-black

To explain: Cobalt imparts blue colour to cement.  Iron oxide in different proportion imparts brown, red and yellow colour.  Manganese dioxide produces brown and black coloured cement.


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