Question

Which equation has both a liquid and a gas as products?
2 upper H g upper O (s) right arrow 2 upper H g (l) plus upper O subscript 2 (g).
2 upper M g (s) plus upper O subscript 2 (g) right arrow 2 upper M g upper O (s).
1 UJpper K upper C l upper O subscript 3 (s) right arrow 2 upper K upper C l (s) plus 3 upper O subscript 2 (g).
Upper M g (s) plus 2 upper H upper C l (a q) right arrow upper H subscript 2 (g) plus upper M g upper C l subscript 2 (a q).

Answer 1

The first equation:
2 HgO (s) → 2 Hg (l) + O2 (g)

It produces liquid mercury (Hg (l)) and oxygen gas (O2 (g)).