SSS 1 Exam > SSS 1 Questions > Choose the correctly matched pair:a)CaO + HO ...
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Choose the correctly matched pair:
- a)CaO + H₂O → Ca(OH)₂ + Heat - Combination Reaction
- b)Fe + 4H₂O → Fe₃O₄ + 4H₂ - Decomposition Reaction
- c)3Fe + 4H₂O → Fe₃O₄ + 4H₂ - Combination Reaction
- d)CO + 2H₂ → CH₃OH - Displacement Reaction
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
Choose the correctly matched pair:a)CaO + HO → Ca(OH) + Heat - Co...
Explanation of Combination Reaction
In the reaction given in option (a):
CaO + HO → Ca(OH) + Heat
This is classified as a combination reaction.
What is a Combination Reaction?
- A combination reaction occurs when two or more reactants combine to form a single product.
- In this case, calcium oxide (CaO) and water (HO) combine to form calcium hydroxide (Ca(OH)₂).
Heat Production
- The reaction releases heat, indicating it is exothermic. This is another characteristic of many combination reactions.
Analysis of Other Options
Option B:
- Fe + 4HO → FeO + 4H: This is incorrectly labeled as a decomposition reaction. In reality, it seems to suggest a reaction involving iron and water, but it's not a typical decomposition.
Option C:
- 3Fe + 4HO → FeO + 4H: This is also not a displacement reaction. It’s a misrepresentation of how iron reacts with water.
Option D:
- CO + 2H → CHOH: This is not a displacement reaction either. It’s a synthesis reaction where carbon monoxide and hydrogen combine to form methanol.
Conclusion
- Therefore, option (a) is the only correctly matched pair, as it represents a classic example of a combination reaction, while the others are inaccurately described.
In the reaction given in option (a):
CaO + HO → Ca(OH) + Heat
This is classified as a combination reaction.
What is a Combination Reaction?
- A combination reaction occurs when two or more reactants combine to form a single product.
- In this case, calcium oxide (CaO) and water (HO) combine to form calcium hydroxide (Ca(OH)₂).
Heat Production
- The reaction releases heat, indicating it is exothermic. This is another characteristic of many combination reactions.
Analysis of Other Options
Option B:
- Fe + 4HO → FeO + 4H: This is incorrectly labeled as a decomposition reaction. In reality, it seems to suggest a reaction involving iron and water, but it's not a typical decomposition.
Option C:
- 3Fe + 4HO → FeO + 4H: This is also not a displacement reaction. It’s a misrepresentation of how iron reacts with water.
Option D:
- CO + 2H → CHOH: This is not a displacement reaction either. It’s a synthesis reaction where carbon monoxide and hydrogen combine to form methanol.
Conclusion
- Therefore, option (a) is the only correctly matched pair, as it represents a classic example of a combination reaction, while the others are inaccurately described.
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Community Answer
Choose the correctly matched pair:a)CaO + HO → Ca(OH) + Heat - Co...
- Option A: CaO + H₂O → Ca(OH)₂ + Heat - This is correctly matched as a Combination Reaction. In this reaction, calcium oxide (CaO) reacts with water (H₂O) to form calcium hydroxide (Ca(OH)₂) and releases heat. This is a classic example of a combination reaction where two or more substances combine to form a single product.
- Option B: Fe + 4H₂O → Fe₃O₄ + 4H₂ - This reaction is incorrectly labeled as a Decomposition Reaction. It is actually a redox reaction involving the oxidation of iron and the reduction of water.
- Option C: 3Fe + 4H₂O → Fe₃O₄ + 4H₂ - This is also incorrectly labeled. Although there is a combination of elements involved, it is best described as a redox reaction rather than a simple Decomposition reaction.
- Option D: CO + 2H₂ → CH₃OH - This is incorrectly matched as a Displacement Reaction. It is actually a synthesis reaction where carbon monoxide (CO) and hydrogen (H₂) combine to form methanol (CH₃OH).
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Choose the correctly matched pair:a)CaO + HO → Ca(OH) + Heat - Combination Reactionb)Fe + 4HO → FeO + 4H - Decomposition Reactionc)3Fe + 4HO → FeO + 4H - Combination Reactiond)CO + 2H → CHOH - Displacement ReactionCorrect answer is option 'A'. Can you explain this answer?
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