Q8 of 39 Page 1

Identify the type of reaction from the following equation:

(i) CH4 + 2O2 → CO2 + 2H2O (ii) Pb(NO3)2 + 2KI → PbI2 + 2KNO3


(iii) CaO + H2O→ Ca(OH)2 (iv) CuSO4 + Zn → ZnSO4 + Cu


(i) CH4 + 2O2 CO2 + 2H2O

(ii) Pb(NO3)2 + 2KI PbI2 + 2KNO3


(iii) CaO + H2O Ca(OH)2


(iv) CuSO4 + Zn ZnSO4 + Cu


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11

Identify the type of chemical reaction taking place

i. on making a solution of potassium chloride with silver nitrate, an insoluble white substance is formed.

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Write the balanced chemical equation for the following reaction and identify the type of reaction and define it.

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 9

When hydrogen gas is passed over heated copper (II) oxide, copper and steam are formed. Write the balanced chemical equation for this reaction and state

(i) the substance oxidised and


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 12

You might have noted that when copper powder is heated in a china dish, the surface of copper powder becomes coated with a black colour substance.(a) How has this black coloured substance formed?(b) What is that black substance?(c) Write the chemical equation of the reaction that takes place. (CBSE 2011)