Q7 of 39 Page 1

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

Iron III oxide reacts with Aluminium and gives molten iron and aluminium oxide. (2012)


Fe2O3 (s) + 2Al (s) 2Fe (l) + Al2O3(l) + Heat

• It is a displacement reaction which is highly exothermic. The amount of heat evolved is so large that the metal is produced in the molten state.


• The displacement reaction of iron (III) oxide with aluminium is known as thermite reaction.


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What is observed when a solution of potassium iodide solution is added to a solution of lead nitrate? (CBSE 2014, 2013)

 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.

ii. on heating green coloured ferrous sulphate crystals, reddish-brown solid is left and the smell of a gas having the odour of burning Sulphur is observed. (CBSE 2007)
 

 8

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


 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


(ii) the substance reduced in the reaction. (2014)