Extra 30 short-answer questions from the Chapter:1 Chemical Reactions and Equations for Class 10 CBSE Science:

30 short-answer questions from the Chapter:1 Chemical Reactions and Equations for Class 10 CBSE

1-10: Basics of Chemical Reactions

What is a chemical reaction?

 

What are reactants and products in a chemical reaction?

 

State the Law of Conservation of Mass with an example.

 

Why should a chemical equation be balanced?

 

What is a balanced chemical equation? Give an example.

 

What is the difference between a physical change and a chemical change?

 

What are the characteristics of a chemical reaction?

 

What happens when magnesium ribbon burns in air? Write the chemical equation.

 

What is an exothermic reaction? Give an example.

 

What is an endothermic reaction? Give an example.

 

11-20: Types of Chemical Reactions

What is a combination reaction? Give an example.

 

What is a decomposition reaction? Give an example.

A reaction where a single compound breaks down into simpler substances.

Example: 2H₂O₂ → 2H₂O + O₂.

 

What are the types of decomposition reactions?

Thermal decomposition (Heat-based)

Electrolytic decomposition (Electricity-based)

 

What is a displacement reaction? Give an example.

 

What is a double displacement reaction? Give an example.

 

What happens when iron nails are placed in copper sulfate solution?

 

Why does the colour of copper sulphate solution change when an iron nail is dipped in it?

 

What happens when silver chloride is exposed to sunlight?

 

What is a redox reaction?

 

What is oxidation and reduction?

 

Write the balanced equation for rusting of iron.

 

What is corrosion? Give an example.

 

How can rusting of iron be prevented?

 

What is rancidity? How can it be prevented?

Why does food packed in chips contain nitrogen gas?

 

What is the importance of a catalyst in a chemical reaction?

 

What happens when quicklime (CaO) reacts with water?

 

What type of reaction is used in black and white photography?

 

Write the equation for the reaction between baking soda and vinegar.

 

What happens when an aqueous solution of sodium sulphate is mixed with barium chloride?