Which chemical equation correctly represents the synthesis of calcium sulfite from calcium oxide and sulfur dioxide?

CaSO3 (s) → CaO (s) + SO2 (g)

CaSO3 (s) + O2 (g) → CaO (s) + SO2 (g)

CaO (s) + SO2 (g) → CaSO3 (s)

CaO (s) + SO2 (g) → CaSO3 (s) + O2 (g)

The chemical equation that correctly represents the synthesis of calcium sulfite is

CaO (s) + SO₂ (g) → CaSO₃ (s)

Explanation

Synthesis reaction is type of chemical reaction in which two or more simple substance combine to form a more complex product.

The reaction above is therefore a synthesis reaction since CaO and So₂ combine to form CaCO₃ (a complex product)

CaO (s) + SO2 (g) → CaSO3 (s)