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The presence of cobalt in cement imparts _________ colour.(a) Yellow(b) Blue(c) Black(d) WhiteThis question was addressed to me during an online interview.I'm obligated to ask this question of Plain and Reinforced topic in portion Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials

Answer»

Right option is (b) BLUE

The explanation: The presence of cobalt in CEMENT IMPARTS blue colour. However, manganese DIOXIDE is used to give black or brown coloured cement and oxide of iron in various PROPORTIONS provide brown, yellow or red colour.



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