Q. 84.0( 3 Votes )
The colour formed on the surface of copper powder when it is heated in a china dish:
The colour formed on the surface of copper powder when it is heated in a china dish is black. Oxidation of copper takes place. As a result, copper oxide is formed which is black in colour.
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Which among the following statement(s) is(are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to:
(i) The formation of silver by decomposition of silver chloride
(ii) Sublimation of silver chloride
(iii) Decomposition of chlorine gas from silver chloride
(iv) Oxidation of silver chlorideEvergreen Science
Which of the following are exothermic processes?
(i) Reaction of water with quicklime
(ii) Dilution of an acid
(iii) Evaporation of water
(iv) Sublimation of camphor (crystals)Evergreen Science