Answer:
(i) hydrolysis; (ii) combination; (iii) single replacement;
(iv) single replacement; (v) double replacement
Explanation:
(i) Carbohydrates are broken down to form glucose
Carbohydrates must react with water to form glucose.
For example,
C₆H₁₁O₅-O-C₆H₁₁O₆ + H-O-H ⟶ 2C₆H₁₂O₆
maltose glucose
This is a hydrolysis reaction — the reaction of a compound in which a molecule of water breaks one or more bonds to form new substances.
The reaction is not a decomposition (a reaction in which a compound breaks down into two or more simpler substances), because two different molecules are involved.
(ii) Tarnishing of copper.
Cu + S ⟶ CuS
This is a combination or synthesis reaction — in which two or more substances combine to form a single new substance.
(iii) Heating of ferric oxide with aluminium powder
Fe₂O₃ + 2Al ⟶ Al₂O₃ + 2Fe
This is a single displacement or single replacement reaction — in which one element replaces another element in a compound.
Here, Al is replacing Fe in its oxide.
(iv) Blue colour of copper sulphate solution disappears when zinc dust is added to it
CuSO₄ + Zn ⟶ ZnSO₄ + Cu
This is a single displacement or single replacement reaction.
Here, Zn is replacing Cu in its sulfate.
(v) Dilute sulfuric acid is added to sodium hydroxide solution
H₂SO₄ + 2NaOH ⟶ Na₂SO₄ + 2H₂O
2H⁺, SO₄²⁻ + 2Na⁺OH⁻ ⟶ 2Na⁺, SO₄²⁻ + 2H-OH
This is a double displacement or double replacement reaction — in which the positive and negative ions of two ionic compounds exchange places to form two new compounds.
The Na⁺ ions are replacing the H⁺ ions in the sulfuric, forming sodium sulfate and water,
