Chapter Exam

Chapter 10: Types of Chemical Reactions — Online MCQ Test

Q: The chemical reaction in which two or more reactants combine to form a single product is known as:

Answer: A. Combination reaction — A combination reaction occurs when two or more substances unite to form a single new substance.

Q: Which of the following is an example of a thermal decomposition reaction?

Answer: B. Heating of calcium carbonate — Thermal decomposition involves the breakdown of a compound into simpler substances using heat, as seen when calcium carbonate is heated into calcium oxide and carbon dioxide.

Q: In the displacement reaction: Fe + CuSO4 -> FeSO4 + Cu, which element is being displaced?

Answer: B. Copper (Cu) — Iron is more reactive than copper, so it displaces copper from the copper sulfate solution.

Q: Consider the reaction: N2(g) + 3H2(g) 2NH3(g). Which action would shift the equilibrium to the right?

Answer: B. Removing ammonia as it is formed — According to Le Chatelier's principle, removing a product shifts the equilibrium towards the forward direction to compensate for the loss.

Q: A substance 'X' has a pH of 3. If it is diluted with water, what happens to its pH value?

Answer: C. It increases towards 7 — Diluting an acid reduces the concentration of H+ ions, which causes the pH to rise and move closer to the neutral value of 7.

SCIENCE · CLASS 10th · Tamil Nadu State Board

Practice Chapter 10: Types of Chemical Reactions with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 10th SCIENCE. This chapter covers: Focusing on chemical transformations this chapter details combination decomposition displacement double displacement and neutralization reactions. Students examine reaction rate fa.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 10: Types of Chemical Reactions — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 10th SCIENCE — Chapter 10: Types of Chemical Reactions, with answers and explanations. These are sample questions; the exam has its own separate question set.

The chemical reaction in which two or more reactants combine to form a single product is known as:

A. Combination reaction ✓
B. Decomposition reaction
C. Displacement reaction
D. Double displacement reaction

Answer: A. Combination reaction
A combination reaction occurs when two or more substances unite to form a single new substance.

Which of the following is an example of a thermal decomposition reaction?

A. Burning of magnesium ribbon
B. Heating of calcium carbonate ✓
C. Reaction of zinc with hydrochloric acid
D. Reaction between silver nitrate and sodium chloride

Answer: B. Heating of calcium carbonate
Thermal decomposition involves the breakdown of a compound into simpler substances using heat, as seen when calcium carbonate is heated into calcium oxide and carbon dioxide.

In the displacement reaction: Fe + CuSO4 -> FeSO4 + Cu, which element is being displaced?

A. Iron (Fe)
B. Copper (Cu) ✓
C. Sulfur (S)
D. Oxygen (O)

Answer: B. Copper (Cu)
Iron is more reactive than copper, so it displaces copper from the copper sulfate solution.

Consider the reaction: N2(g) + 3H2(g) <=> 2NH3(g). Which action would shift the equilibrium to the right?

A. Increasing the volume of the container
B. Removing ammonia as it is formed ✓
C. Adding more ammonia
D. Decreasing the pressure

Answer: B. Removing ammonia as it is formed
According to Le Chatelier's principle, removing a product shifts the equilibrium towards the forward direction to compensate for the loss.

A substance 'X' has a pH of 3. If it is diluted with water, what happens to its pH value?

A. It remains the same
B. It decreases
C. It increases towards 7 ✓
D. It drops to 0

Answer: C. It increases towards 7
Diluting an acid reduces the concentration of H+ ions, which causes the pH to rise and move closer to the neutral value of 7.

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