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(i) Account for the following (a) Wh...

(i) Account for the following
(a) White silver chloride 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 .

Text Solution

Verified by Experts

(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 reaction element 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 reduction reaction .
`ZnO+CrarrZn+CO`
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