1.

(a) Write one equation each for decomposition reaction when energy is supplied in the form of : (i) heat ,(ii) light. (b) Account for the following : (i) Paint is applied on iron articles. (ii) Oil and fat containing food items are flushed withnitrogen . (iii) When an iron nail kept in copper sulphate solution, blue colour of the solution fades and iron nail becomes brownish .

Answer»

Solution :(a) (i) `CaCO_(3)(S) overset Delta rarrCaO(S)+CO_(2)(g)`
(II) `2AgBr overset("Sunlight")rarr2Ag+Br_(2)`
(b) (i) To protect the iron articles from corrosion . When iron articles are exposed to moist air , corrosion takes place . When the surface is covered by paint, it is not exposed to moist air .
(ii) To flush out any air or oxygen present in the packet . In the absence of oxygen , food items will not get rancid.
(iii) Since iron is more reactive than copper , it displaces copper from copper sulphate solutionand the blue colour of solution fades . Dueto the DEPOSITION of copper on iron nail , iron nail becomes brownish.


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