State the kind of chemical reactions in the following examples: (2014)
(i) Digestion of food in stomach
(ii) Combustion of coal in air
(iii) Heating of limestone
(i) Digestion of food in stomach: During digestion, the complex food is broken into simpler form.
Therefore, it is a type of decomposition reaction.
(ii) Combustion of coal is air: During combustion the coal burns in air to form CO2, H2O along with the evolution of heat. Thus, it is a type of exothermic decomposition reaction.
(ii) Heating of limestone: When limestone is heated strongly, it breaks into CO2 and lime. Thus it is a type of thermal decomposition reaction.
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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