Four students A, B, C and D were asked to carry out a decomposition reaction. Each one followed different method as mentioned A: Heated aqueous solution of iron sulphate in a test tube B: Added Zn granules to iron sulphate in a test tube and then heated the mixture C: Heated crystals of iron sulphate in a test tube D: Heated crystals of iron sulphate along with copper sulphate crystals in a china dish Which student adopted the correct method?
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