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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 |
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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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