A student strongly heats hydrated ferrous sulphate salt in a dry test-tube. He would observe a:

Ferrous sulphate on heating gives:

Ferrous sulphate on heating gives:

Ferrous sulphate on heating gives

List any two observations when Ferrous Sulphate is heated in a dry test tube?

When an aluminium strip is kept immersed in freshly prepared ferrous sulphate solution taken in a test tube, the change which is observed is: