Bhawana took a pale green substance A in a test tube. and heated it over the flame of a burner. A brown colored residue B was formed along with evolution of two gases with burning smell of sulphur.Idetify A & B. Write the chemical reaction involved.;
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A- ferrous sulphate.
B- sulphur
2FeSo4 -->2Fe + So2+2 So3
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