When water is added to calcium oxide, a large amount of heat is released and calcium hydroxide is formed. What is the correct classification of this reaction?
Answer and explanation
Correct answer: Combination and exothermic reaction
Calcium oxide and water combine to form one product: CaO + H₂O → Ca(OH)₂. Formation of a single product from two reactants makes it a combination reaction. Because a considerable amount of heat is released, it is also exothermic. It is not decomposition, displacement, double displacement or precipitation, so option A gives both correct classifications.
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What is the correct answer to this question?
Combination and exothermic reaction
Why is this the correct answer?
Calcium oxide and water combine to form one product: CaO + H₂O → Ca(OH)₂. Formation of a single product from two reactants makes it a combination reaction. Because a considerable amount of heat is released, it is also exothermic. It is not decomposition, displacement, double displacement or precipitation, so option A gives both correct classifications.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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