Which statement best describes the reaction of calcium oxide with water?
Answer and explanation
Correct answer: It is a combination reaction that forms one product and releases heat.
The reaction is \(\mathrm{CaO + H_2O \rightarrow Ca(OH)_2}\). Calcium oxide and water combine to form only one product, calcium hydroxide, so it is a combination reaction. Heat is released, making it exothermic. In a decomposition reaction, one compound breaks down into two or more products, which does not occur here.
Frequently asked questions
What is the correct answer to this question?
It is a combination reaction that forms one product and releases heat.
Why is this the correct answer?
The reaction is \(\mathrm{CaO + H_2O \rightarrow Ca(OH)_2}\). Calcium oxide and water combine to form only one product, calcium hydroxide, so it is a combination reaction. Heat is released, making it exothermic. In a decomposition reaction, one compound breaks down into two or more products, which does not occur here.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
