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Important Questions Chemical Reactions and Equations - Class 10 PDF Download

Question 1. Which one is a chemical change-rusting of iron or melting of iron? [Board Term-I Set-11, 2011] 

Answer. Rusting of iron.
Question 2 Name and state the law which is kept in mind while we balance a chemical equation. [Board Term-I Set-21, 2011]
Answer. Law of conservation of mass. Mass can neither be created nor be destroyed during a chemical reaction.
Question 3. State one basic difference between a physical change and a chemical change. [Board Term-I Set-21, 2011]
Answer. In a physical change, no new substance is formed. In a chemical change, a new substance is formed.
Question 4. What happens when quicklime is added to water? [Board Term-I Set-Al, 2011, 2010]
Answer. Quicklime reacts with water vigorously to produce slaked lime and a large amount of heat.
Question 5. Which one is the chemical change – Fermentation of fruit juice or diluting fruit juice? [CBSE 2010] 
Answer. Fermentation of fruit juice. 

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