Question

1.
A student strongly heated hydrated ferrous sulphate salt in a dry test tube. He observed
A) yellow residue
B) brown residue
C) light green residue
D) white residue

Answer 1

B) brown residue

On heating hydrated ferrous sulphate salt in a dry test tube, it will lose its water molecules and become anhydrous Fe2O3 which is reddish brown.