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Write an activity to each of the following chemical reaction. 

A) Photo chemical reaction 

B) Chemical displacement reaction.

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A) Photo chemical reaction : 

  1.  Take a pinch of Silver Bromide in a watch glass and it in the presence of sunlight. 
  2.  Silver Bromide decomposes to silver and Bromine in sunlight.
  3.  Light yellow coloured silver bromide turned to grey 

B) Chemical displacement: 

  1.  Take a small quantity of zinc dust in a conical flask and add some drops of dilute hydrochloric acid slowly. 
  2.  Immediately we can observe the gas bubbles coming out from the solution. 
  3.  This is because zinc reacts with dilute hydrochloric acid and liberates hydrogen gas.  Zn + 2HCl → ZnCl2 + H↑ 
  4.  In this reaction the element zinc has displaced hydrogen from hydrochloric acid.

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