Answer the following question:
 
Sujitha was performing an experiment in her chemistry lab. She took some crystals of \(FeSO_4.7H_2O\) in a test tube and heated them gently.
 
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i. What is the colour of anhydrous \(FeSO_4\) after heating?
 
ii. The green colour of \(FeSO_4.7H_2O\) is due to