CBSE Class 10 Science MCQs Chapter 1 Chemical Reactions and Equations with Answers

Chemical Reactions and Equations: This article has 15 multiple-choice questions (MCQs) from Chapter 1 of the NCERT Class 10 Science book. It covers different parts of chemical reactions and how they’re used. These questions test what you’ve learned in this important chapter, helping you do well in science class.

This article explores chemical reactions with MCQs. They’re based on Chapter 1 of the NCERT Class 10 Science book and challenge your understanding of the subject. They’re great for students who want to do well in science class. Let’s learn about the basic ideas behind chemical changes and how they affect our lives.”

Class 10 Science MCQs – Chapter 1: Chemical Reactions and Equations

Question: Which of the following is not a chemical change?

1. Burning of paper
2. Melting of ice
3. Rusting of iron
4. Digestion of food

Answer: b) Melting of ice

Question: In a chemical reaction, the substances before the reaction are called:

1. Reactants
2. Products
3. Elements
4. Compounds

Answer: a) Reactants

Question: Which of the following is a balanced chemical equation?

1. H₂ + O₂ → H₂O
2. Fe + O₂ → Fe₂O₃
3. CaCO₃ → CaO + CO₂
4. HCl + NaOH → NaCl + H₂O

Answer: d) HCl + NaOH → NaCl + H₂O

Question: What type of reaction is represented by the equation: 2H₂ + O₂ → 2H₂O?

1. Combination reaction
2. Decomposition reaction
3. Displacement reaction
4. Double displacement reaction

Answer: a) Combination reaction

Question: Which of the following is a decomposition reaction?

1. 2H₂O → 2H₂ + O₂
2. 2Na + Cl₂ → 2NaCl
3. CaCO₃ → CaO + CO₂
4. AgNO₃ + NaCl → AgCl + NaNO₃

Answer: c) CaCO₃ → CaO + CO₂

Question: What is the product of the reaction between magnesium (Mg) and hydrochloric acid (HCl)?

1. Mg(OH)₂ + H₂
2. MgCl₂ + H₂
3. MgO + H₂O
4. MgCO₃ + H₂

Answer: b) MgCl₂ + H₂

Question: What happens to the mass during a chemical reaction?

1. It increases
2. It decreases
3. It remains the same
4. It varies

Answer: c) It remains the same

Question: Which of the following statements is true about exothermic reactions?

1. They absorb heat
2. They release heat
3. They occur at low temperatures
4. They require energy input

Answer: b) They release heat

Question: Which of the following represents a single displacement reaction?

1. FeS + 2HCl → FeCl₂ + H₂S
2. Na₂SO₄ + BaCl₂ → 2NaCl + BaSO₄
3. 2H₂O → 2H₂ + O₂
4. 2AgNO₃ + Zn → Zn(NO₃)₂ + 2Ag

Answer: d) 2AgNO₃ + Zn → Zn(NO₃)₂ + 2Ag

Question: What is the product of the reaction between sodium hydroxide (NaOH) and hydrochloric acid (HCl)?

1. NaCl + H₂O
2. NaOH + HCl
3. Na₂Cl + H₂O
4. NaOH + H₂

Answer: a) NaCl + H₂O

Question: What is the product of the reaction between magnesium (Mg) and hydrochloric acid (HCl)?

• a) Mg(OH)2 + H2
• b) MgCl2 + H2
• c) MgO + H2O
• d) MgCO3 + H2

Answer: b) MgCl2 + H2

Question: What happens to the mass during a chemical reaction?

• a) It increases
• b) It decreases
• c) It remains the same
• d) It varies

Answer: c) It remains the same

Question: Which of the following statements is true about exothermic reactions?

• a) They absorb heat
• b) They release heat
• c) They occur at low temperatures
• d) They require energy input

Answer: b) They release heat

Question: Which of the following represents a single displacement reaction?

• a) FeS + 2HCl → FeCl2 + H2S
• b) Na2SO4 + BaCl2 → 2NaCl + BaSO4
• c) 2H2O → 2H2 + O2
• d) 2AgNO3 + Zn → Zn(NO3)2 + 2Ag

Answer: d) 2AgNO3 + Zn → Zn(NO3)2 + 2Ag

Question: What is the product of the reaction between sodium hydroxide (NaOH) and hydrochloric acid (HCl)?

• a) NaCl + H2O
• b) NaOH + HCl
• c) Na2Cl + H2O
• d) NaOH + H2

Answer: a) NaCl + H2O

Question: Which gas is evolved when zinc metal reacts with dilute sulfuric acid (H2SO4)?

• a) Oxygen
• b) Hydrogen
• c) Carbon dioxide
• d) Sulfur dioxide

Answer: b) Hydrogen

Question: What is the general formula for a neutralization reaction?

• a) Acid + Metal → Salt + Hydrogen gas
• b) Acid + Metal Oxide → Salt + Water
• c) Acid + Base → Salt + Water
• d) Acid + Carbonate → Salt + Water + Carbon dioxide

Answer: c) Acid + Base → Salt + Water

Question: What is the product formed when copper (II) oxide reacts with sulfuric acid (H2SO4)?

• a) CuSO4 + H2O
• b) Cu(OH)2 + H2O
• c) CuSO4 + O2
• d) CuO + H2O

Answer: a) CuSO4 + H2O

Question: What is the chemical formula of sodium chloride?

• a) NaCl
• b) Na2Cl
• c) NaCl2
• d) Na2Cl2

Answer: a) NaCl

Question: Which of the following statements is true about combustion reactions?

• a) They involve the reaction of a metal with an acid
• b) They involve the reaction of a non-metal with oxygen
• c) They involve the reaction of a base with an acid
• d) They involve the reaction of an acid with a carbonate

Answer: b) They involve the reaction of a non-metal with oxygen

What type of reaction is represented by the equation: 2Na + Cl₂ → 2NaCl?

• a) Combination reaction
• b) Decomposition reaction
• c) Displacement reaction
• d) Double displacement reaction

Answer: c) Displacement reaction

What is the chemical formula of sulfur dioxide?

• a) SO₂
• b) SO₃
• c) H₂SO₄
• d) H₂SO₃

Answer: a) SO₂

Which of the following is an example of a redox reaction?

• a) CaCO₃ → CaO + CO₂
• b) 2Na + Cl₂ → 2NaCl
• c) Fe + S → FeS
• d) Zn + 2HCl → ZnCl₂ + H₂

Answer: d) Zn + 2HCl → ZnCl₂ + H₂

Question: What type of reaction is represented by the equation: CH₄ + 2O₂ → CO₂ + 2H₂O?

• a) Combination reaction
• b) Decomposition reaction
• c) Displacement reaction
• d) Combustion reaction

Answer: d) Combustion reaction

Question: What is the product formed when sodium carbonate (Na₂CO₃) reacts with hydrochloric acid (HCl)?

• a) NaCl + CO₂
• b) NaCl + H₂O + CO₂
• c) Na₂Cl + H₂O + CO₂
• d) NaHCO₃ + Cl₂

Answer: b) NaCl + H₂O + CO₂

Question: Which of the following is an example of a synthesis reaction?

• a) CH₄ + 2O₂ → CO₂ + 2H₂O
• b) CaCO₃ → CaO + CO₂
• c) 2H₂O → 2H₂ + O₂
• d) 2H₂ + O₂ → 2H₂O

Answer: a) CH₄ + 2O₂ → CO₂ + 2H₂O

Question: What is the product of the reaction between magnesium oxide (MgO) and hydrochloric acid (HCl)?

• a) MgCl₂ + H₂
• b) Mg(OH)₂ + HCl
• c) MgCl₂ + H₂O
• d) Mg(OH)₂ + H₂O

Answer: c) MgCl₂ + H₂O

Question: What is the chemical formula of calcium oxide?

• a) CaO
• b) Ca(OH)₂
• c) CaCO₃
• d) CaSO₄

Answer: a) CaO

Question: Which gas is produced when zinc carbonate (ZnCO₃) decomposes upon heating?

• a) Oxygen
• b) Hydrogen
• c) Carbon dioxide
• d) Sulfur dioxide

Answer: c) Carbon dioxide

Question: What is the product formed when sulfur dioxide (SO₂) reacts with water (H₂O)?

• a) H₂SO₄
• b) H₂SO₃
• c) H₂S
• d) H₂O₂

Answer: b) H₂SO₃

Question: Which of the following is an example of a precipitation reaction?

• a) 2Na + Cl₂ → 2NaCl
• b) CaCO₃ → CaO + CO₂
• c) Na₂SO₄ + BaCl₂ → 2NaCl + BaSO₄
• d) 2H₂O → 2H₂ + O₂

Answer: c) Na₂SO₄ + BaCl₂ → 2NaCl + BaSO₄

Question: What is the product formed when hydrogen peroxide (H₂O₂) decomposes?

• a) H₂O
• b) O₂
• c) H₂O + O₂
• d) H₂ + O₂

Answer: c) H₂O + O₂

Question: What is the chemical formula of hydrochloric acid?

• a) HCl
• b) H₂SO₄
• c) HNO₃
• d) H₂O₂

Answer: a) HCl

Question: Which of the following is an example of a neutralization reaction?

• a) CaCO₃ → CaO + CO₂
• b) 2Na + Cl₂ → 2NaCl
• c) HCl + NaOH → NaCl + H₂O
• d) 2H₂O → 2H₂ + O₂

Answer: c) HCl + NaOH → NaCl + H₂O

Question: What is the product formed when potassium hydroxide (KOH) reacts with sulfuric acid (H₂SO₄)?

• a) K₂SO₄ + H₂O
• b) K₂SO₄ + H₂SO₄
• c) KOH + H₂SO₄
• d) KHSO₄ + H₂O

Answer: a) K₂SO₄ + H₂O