Performing and observing the following
reactions and classifying them into:
Combination reaction
Decomposition reaction
Displacement reaction
Double displacement reaction
Action of water on quicklime
Action of heat on ferrous sulphate crystals
Iron nails kept in copper
sulphate solution
Reaction between sodium sulphate and barium chloride solutions

Dear student,

A) Quick lime is calcium oxide (CaO). When water is added to a small quantity of quick lime in a beaker, it forms a suspension of slaked lime (Ca(OH)2). The beaker becomes hot as the reaction is exothermic. It is a combination reaction.
CaO + H2O Ca(OH)2

B) Take ferrous sulphate crystals in a dry boiling tube and hold the tube with a tube holder. On heating, the colour of crystals changes from green to white and then brown and a gas with the smell of burning sulphur is evolved. It is a decomposition reaction.
2FeSO4. 7H2O  -14H2O     2FeSO4   Fe2O3 + SO2(g)+ SO3(g) Green                                      white            brown

C)Iron being more reactive than copper will displace copper from copper sulphate solution. A brown layer of copper will be deposited on iron nail and blue colour of the solution will fade away. It is a displacement reaction.
Fe + CuSO4 FeSO4 + Cu

D) O
n mixing a solution of barium chloride with sodium sulphate, a white precipitate of barium sulphate is formed. It is a double displacement reaction. 
  BaCl2 + Na2SO4 BaSO4 + 2NaClBarium    sodium       barium      sodiumchloride  sulphate    sulphate    chloride


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Iron nails kept in copper sulphate is a displacement reaction
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(IV) it is double displacement reaction
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(II) It is decomposition reaction
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