20 Мувофикати моддаҳои аввала ва маҳсули реаксияро муайян намоед:

Solution:

The question asks to match the reactants with the correct products.

1. CaO + H₂O → Ca(OH)₂
2. CaO + H₂CO₃ → CaCO₃ + H₂O
3. CaO + H₂SO₄ → CaSO₄ + H₂O
4. CaO + CO₂ → CaCO₃

Matching the options:

• A) CaO + H₂O corresponds to 3) Ca(OH)₂
• B) CaO + H₂CO₃ corresponds to 4) CaCO₃ + H₂O
• C) CaO + H₂SO₄ corresponds to 1) CaSO₄ + H₂O
• D) CaO + CO₂ corresponds to 5) CaCO₃

Answer: A-3, B-4, C-1, D-5