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Which of the following equations represents a balanced double-displacement reaction?
A{'text': 'BaCl₂ + H₂SO₄ → BaSO₄ + HCl'}
B{'text': 'Ba + H₂SO₄ → BaSO₄ + H₂'}
C{'text': 'BaCl₂ + H₂SO₄ → BaSO₄ + 2HCl'}
D{'text': '2Ba + H₂SO₄ → 2BaSO₄ + 2HCl'}
Answer & Solution
Correct answer: C. {'text': 'BaCl₂ + H₂SO₄ → BaSO₄ + 2HCl'}
1. A balanced equation must have equal atoms of every element on both sides.
2. BaCl₂ + H₂SO₄ → BaSO₄ + 2HCl: Ba 1=1, Cl 2=2, H 2=2, S 1=1, O 4=4 ✓.
3. The first option leaves Cl unbalanced (2 vs 1) and H unbalanced.
4. The other options misrepresent the reactants or coefficients.
5. Hence the balanced equation is **BaCl₂ + H₂SO₄ → BaSO₄ + 2HCl**.
_Source: Selina Concise ICSE Class 8 Chemistry Ch 6 "Chemical Reactions", Balanced equation examples_
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