Heating which of the following salts in a dry test tube may cause a change in their colour? (a) ...

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Heating which of the following salts in a dry test tube may cause a change in their colour?
(a) \( \mathrm{ZnCO}_{3} \) (White)
(b) \( \mathrm{Co}\left(\mathrm{NO}_{3}\right)_{2} \cdot 6 \mathrm{H}_{2} \mathrm{O} \) (Red)
(c) \( \mathrm{FeSO}_{4} \cdot 6 \mathrm{H}_{2} \mathrm{O}( \) Green \( ) \)
(d) \( \mathrm{MnSO}_{4} \) (Faint pink)
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