Performing the following reactions and classifying them as physical or chemical changes :
a) Iron with copper sulphate solution in water
b) Burning of magnesium ribbon in air
c) Zinc with dilute sulphuric acid
d) Heating of copper sulphate crystals
e) Sodium sulphate with barium chloride in the form of their solutions in water.
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a,b,c,d are chemical reactions while e is a physical reaction
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