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Which of the equations correctly describes incomplete combustion? (A) C₂H₅OH(l) + 2O₂(g) → 2CO(g) + 3H₂O(l) (B) C₂H₅OH(l) + rac{7}{2}O₂(g) → 2CO₂(g) + 3H₂O(l) (C) C₂H₅OH(l) + 3O₂(g) → 2CO₂(g) + 3H₂O(l) (D) C₂H₅OH(l) + 2O₂(g) → C(s) + CO(g) + 3H₂O(l) - HSC - SSCE Chemistry - Question 10 - 2015 - Paper 1
Question 10
Which of the equations correctly describes incomplete combustion? (A) C₂H₅OH(l) + 2O₂(g) → 2CO(g) + 3H₂O(l) (B) C₂H₅OH(l) + rac{7}{2}O₂(g) → 2CO₂(g) + 3H₂O(l) (C... show full transcript
Worked Solution & Example Answer:Which of the equations correctly describes incomplete combustion? (A) C₂H₅OH(l) + 2O₂(g) → 2CO(g) + 3H₂O(l) (B) C₂H₅OH(l) + rac{7}{2}O₂(g) → 2CO₂(g) + 3H₂O(l) (C) C₂H₅OH(l) + 3O₂(g) → 2CO₂(g) + 3H₂O(l) (D) C₂H₅OH(l) + 2O₂(g) → C(s) + CO(g) + 3H₂O(l) - HSC - SSCE Chemistry - Question 10 - 2015 - Paper 1
Step 1
Which of the equations correctly describes incomplete combustion?
Answer
To determine which equation describes incomplete combustion, we need to identify the presence of carbon monoxide (CO) and elemental carbon (C) in the products, as these are indicators of incomplete combustion.
Analyzing Each Option:
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Option A: C₂H₅OH(l) + 2O₂(g) → 2CO(g) + 3H₂O(l)
- This equation produces carbon monoxide (CO) as a product, indicating incomplete combustion. Therefore, this option is correct.
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Option B: C₂H₅OH(l) + rac{7}{2}O₂(g) → 2CO₂(g) + 3H₂O(l)
- This results in carbon dioxide (CO₂) only, indicating complete combustion. Therefore, this option is incorrect.
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Option C: C₂H₅OH(l) + 3O₂(g) → 2CO₂(g) + 3H₂O(l)
- Similar to Option B, it produces only carbon dioxide (CO₂), indicating complete combustion. Therefore, this option is incorrect.
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Option D: C₂H₅OH(l) + 2O₂(g) → C(s) + CO(g) + 3H₂O(l)
- This equation produces both elemental carbon (C) and carbon monoxide (CO), which are both indicators of incomplete combustion. Therefore, this option is also correct.
Conclusion: The equations that describe incomplete combustion are (A) and (D).