Q. 19

(a) What ha

Answer :

(a) When barium chloride solution is added to sodium sulphate solution, then a white precipitate of barium sulphate is formed along with sodium chloride solution:


It is an example of a double displacement reaction. In this displacement reaction, two compounds – barium chloride and sodium sulphate react to form two new compounds – barium sulphate and sodium chloride. An exchange of ions takes place in this reaction.


For example, the barium ions (Ba2+) of barium chloride react with sulphate ions of sodium sulphate to form barium sulphate . In this reaction, barium sulphate is formed as a white, insoluble solid which separates out suddenly from solution.


Reaction will take place if the reactants are in a solid state.


(b) When iron nails are dipped in copper sulphate solution, then iron sulphate solution and copper metal are formed:



In this reaction, iron displaces copper from copper sulphate solution. The deep blue colour of copper sulphate solution fades due to the formation of light green solution of iron sulphate. This displacement reaction occurs because iron is more reactive than copper. Also a brown substance will be deposited on the iron nail. This substance is nothing but copper metal.


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