Which of the following reaction has not been correctly represented ?

Foundation

Chemistry Foundation

Double Displacement Reaction

Question

Zn(s) + H₂SO₄(aq) → ZnSO₄ ↓ + H₂(g)

C (s) + O₂(g) → CO₂(g) + Heat

BaCl₂ (aq) + H₂SO₄(aq) → BaSO₄ ↓ + 2HCl

2KClO₃(s) $\overset{Δ}{\to}$ 2KCl(s) + 3O₂

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To identify the incorrectly represented reaction, we must check if each equation is balanced and uses correct chemical notation.

Option 1: Zn(s) + H₂SO₄(aq) → ZnSO₄ + H₂(g). This is balanced and correct.

Option 2: C(s) + O₂(g) → CO₂(g) + Heat. This is balanced and correct.

Option 3: BaCl₂(aq) + H₂SO₄(aq) → BaSO₄ + 2HCl. This is balanced and correct.

Option 4: $2 KClO_{3} (s) \overset{Δ}{\to} 2 KCl (s) + 3 O_{2}$ . This is balanced, but the precipitate symbol (↓) is missing for the insoluble BaSO₄ in option 3, making it the incorrect representation.

Final Answer: The reaction not correctly represented is BaCl₂(aq) + H₂SO₄(aq) → BaSO₄ + 2HCl, as it lacks the precipitate symbol (↓) for BaSO₄.