(1) yellow residue(2)brown residue(3)light green residue(4) white residue"">

A student strongly heats hydrated ferrous sulphate salt in a dry test-tube. He would observe a :
(1) yellow residue(2)brown residue
(3)light green residue(4) white residue
"


Correct answer: (2) brown residue

Explanation: Ferrous sulphate is a hydrated salt that has blue-green colour. On heating in a dry test tube, it will lose its water molecules and become anhydrous Fe2O3 which is reddish-brown in colour. 

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Updated on: 10-Oct-2022

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