Question

What happens when magnesium ribbon is burnt in air and coppersulphate is heated in a dry boiling tube.

Answer 1

Dear student,

Magnesium burns on air to form magnesium oxide.
2Mg (s) + O₂ (g) [from air] ------------> 2MgO (magnesium oxide)

copper sulfate when heated in dry tube loses water of hydration and itself becomes anhydrous.
CuSO₄.5H₂O (s) ---------------------> CuSO₄ (s) + 5H₂O
Copper sulfate (blue in color) Copper sulfate anhydrous (white in color)

Regards