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-brownI have been asked this question by my college director while I was bunking the class.My question comes from Types of Cement and Uses topic in division Materials for Construction of Basic Civil Engineering

Which pair of the compound and coloured cement mentioned below is wron

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-brownI have been asked this question by my college director while I was bunking the class.My question comes from Types of Cement and Uses topic in division Materials for Construction of Basic Civil Engineering
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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