1.

(i) Accountfor the following (a) White silverchloride turns grey in sunlight . (b) Brown coloured copper powder on heating in air turns into black coloured substance . (ii) What do you mean by : (a) Displacement rection (b) Reduction reaction Write balanced chemical equation .

Answer»

Solution :(i) (a) Due to the decomposition of silver chloride into silver and chloride by SUNLIGHT .
`2AgCl overset ("Sunlight")rarr2Ag+Cl_(2)`
(b) Due to the oxidation of copper powder to copper oxide, BROWN COLOUR turns into BLACK
`2Cu(S)+O(g)rarrCuO_(S)`
(ii) (a) A chemical reaction in which the more reaction element displacement the less reactionelement its compounds is called displacement reaction .
`CuSO_(4)(aq)+ZN(S)rarrZnSO_(4)(aq)+Cu(s)`
(b) A chemical reaction in which hydrogen is added or oxygen is removed is called reductionreaction .
`ZnO+CrarrZn+CO`


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