Cu, CO₂, KOH, HI, CaO, Zn, K₂CO₃, Ag
Cu+2NaOH +2H₂O=Na₂[Cu(OH)₄]+H₂↑
2Cu +4HI=2H[CuI₂] + H₂↑
CO₂ + 2KOH=K₂CO₃ + H₂O
CO₂+ CaO= CaCO₃↓
KOH +HI = KI +H₂O
2KOH + Zn +2H₂O=K₂[Zn(OH)₄] + 2H₂↑
HI + CaO=CaI₂ + H₂O
2HI +Zn = ZnI₂ +H₂↑
2HI + K₂CO₃ = 2KI + CO₂↑ + H₂O