Chemistry might seem complex, but understanding reaction types makes it much simpler. In this guide, we’ll practice the questions and answers for types of chemical reactions Class 10 students! The four fundamental reaction types covered in your NCERT textbook: combination, decomposition, displacement, and double displacement reactions. The following questions are based off the chapter.
Types of Chemical Reactions Class 10 Question and Answers
Combination Reactions
Q1: What is a combination reaction?
A: A combination reaction is when two or more substances combine to form a single product.
Q2: What happens when calcium oxide reacts with water?
A: When calcium oxide (quick lime) reacts with water, it forms calcium hydroxide (slaked lime) and releases heat.
Q3: Is the burning of coal a combination reaction?
A: Yes, burning of coal is a combination reaction where carbon combines with oxygen to form carbon dioxide.
Q4: Are combination reactions usually hot or cold?
A: Combination reactions often release heat, making them exothermic reactions.
Decomposition Reactions
Q5: What happens in a decomposition reaction?
A: In a decomposition reaction, a single substance breaks down to form two or more simpler substances.
Q6: What color change happens when ferrous sulphate crystals are heated?
A: The green color of ferrous sulphate crystals changes when heated as they decompose.
Q7: What three energy forms can cause decomposition reactions?
A: Decomposition reactions can be caused by heat, light, or electricity.
Q8: What happens when calcium carbonate is heated?
A: When calcium carbonate (limestone) is heated, it breaks down into calcium oxide (quick lime) and carbon dioxide gas.
Displacement Reactions
Q9: What is a displacement reaction?
A: A displacement reaction happens when a more reactive element takes the place of a less reactive element in a compound.
Q10: What happens when an iron nail is put in copper sulphate solution?
A: When an iron nail is put in copper sulphate solution, the iron displaces the copper, turning the nail brownish and making the blue solution lighter.
Q11: Why does zinc displace copper from copper sulphate?
A: Zinc displaces copper from copper sulphate because zinc is more reactive than copper.
Double Displacement Reactions
Q12: What happens in a double displacement reaction?
A: In a double displacement reaction, ions are exchanged between two compounds to form two new compounds.
Q13: What forms when sodium sulphate and barium chloride solutions are mixed?
A: When sodium sulphate and barium chloride solutions are mixed, a white solid (precipitate) of barium sulphate forms, along with sodium chloride solution.
Q14: What is a precipitation reaction?
A: A precipitation reaction is any reaction that produces an insoluble solid (precipitate) in a solution
Whether you’re preparing for an exam or simply curious about how chemicals interact, this Class 10 chemistry reactions Q&A will build your confidence in tackling Class 10 chemistry concepts.
See More:
Want to brush up on Types of Chemical Reactions Summary Notes: Class 10 NCERT Science.