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Q104
(CAPF/2025)
Science & Technology › Basic Science (Physics, Chemistry, Biology) › Basic chemical principles
Answer Verified
Match List-I with List-II and select the answer using the code given below the Lists:
| List-I (Reaction) | List-II (Type of Reaction) |
|---|---|
| A. CH₄ + 2O₂ → CO₂ + 2H₂O + heat and light | 1. Combustion |
| B. Mg + H₂SO₄ → MgSO₄ + H₂ | 2. Double displacement |
| C. 2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O | 3. Displacement |
| D. NaCl + AgNO₃ → NaNO₃ + AgCl | 4. Neutralization |
Result
Your answer:
—
·
Correct:
B
Explanation
The correct matching of the chemical reactions with their types is as follows:
- A. CH₄ + 2O₂ → CO₂ + 2H₂O + heat and light: This is a combustion reaction. Methane reacts with oxygen to produce carbon dioxide, water, and heat. (A-1)
- B. Mg + H₂SO₄ → MgSO₄ + H₂: This is a displacement reaction. Magnesium is more reactive than hydrogen and displaces it from sulfuric acid. (B-3)
- C. 2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O: This is a neutralization reaction. A base (NaOH) reacts with an acid (H₂SO₄) to form a salt and water. (C-4)
- D. NaCl + AgNO₃ → NaNO₃ + AgCl: This is a double displacement reaction. The ions of two compounds exchange places to form two new compounds. (D-2)
Therefore, the correct code is A-1, B-3, C-4, D-2.
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