AP POLYCET CHEMISTRY Multiple Choice Questions (MCQs)
AP POLYCET Chemistry - Chemical Reactions and Equations
- Which of the following is an example of a combination reaction?
- A) NaOH + HCl → NaCl + H₂O
- B) CaO + H₂O → Ca(OH)₂
- C) N₂ + O₂ → 2NO
- D) 2H₂O → 2H₂ + O₂
Answer: B) CaO + H₂O → Ca(OH)₂
- Which of the following is the correct balanced equation for the reaction of hydrogen with oxygen?
- A) 2H₂ + O₂ → 2H₂O
- B) 4H₂ + O₂ → 4H₂O
- C) H₂ + O₂ → H₂O
- D) H₂ + O₂ → H₂O₂
Answer: A) 2H₂ + O₂ → 2H₂O
- Which of the following is a redox reaction?
- A) NaOH + HCl → NaCl + H₂O
- B) 2H₂ + O₂ → 2H₂O
- C) N₂ + O₂ → 2NO
- D) CaO + H₂O → Ca(OH)₂
Answer: C) N₂ + O₂ → 2NO
- Which of the following is an example of a double displacement reaction?
- A) NaOH + HCl → NaCl + H₂O
- B) BaCl₂ + Na₂SO₄ → BaSO₄ + NaCl
- C) Cu + O₂ → CuO
- D) N₂ + O₂ → 2NO
Answer: B) BaCl₂ + Na₂SO₄ → BaSO₄ + NaCl
- What is the molar mass of H₂SO₄?
- A) 98 g/mol
- B) 56 g/mol
- C) 62 g/mol
- D) 74 g/mol
Answer: A) 98 g/mol
- What is the coefficient of oxygen in the balanced equation for the combustion of propane C₃H₈?
- A) 5
- B) 4
- C) 3
- D) 2
Answer: A) 5
- Which of the following is true for a chemical reaction?
- A) The total mass of the products is greater than the total mass of the reactants.
- B) The total mass of the products is equal to the total mass of the reactants.
- C) The total mass of the products is less than the total mass of the reactants.
- D) None of the above.
Answer: B) The total mass of the products is equal to the total mass of the reactants.
- Which of the following is a characteristic of a decomposition reaction?
- A) Two or more reactants combine to form a single product.
- B) A single reactant breaks down to form two or more products.
- C) No reactant is involved in the reaction.
- D) A gas is always produced in the reaction.
Answer: B) A single reactant breaks down to form two or more products.
- What is the oxidation state of carbon in CO₂?
- A) +4
- B) +2
- C) 0
- D) -4
Answer: A) +4
- Which of the following statements is correct about a catalyst?
- A) It increases the activation energy of a reaction.
- B) It decreases the activation energy of a reaction.
- C) It is consumed during the reaction.
- D) It does not affect the rate of reaction.
Answer: B) It decreases the activation energy of a reaction.
- Which of the following reactions is an example of a neutralization reaction?
- A) NaOH + HCl → NaCl + H₂O
- B) NaOH + NaCl → Na₂O
- C) CuSO₄ + Zn → Cu + ZnSO₄
- D) C₃H₈ + O₂ → CO₂ + H₂O
Answer: A) NaOH + HCl → NaCl + H₂O
- What is the volume of 1 mole of an ideal gas at standard temperature and pressure (STP)?
- A) 1 L
- B) 22.4 L
- C) 24 L
- D) 12 L
Answer: B) 22.4 L
- Which of the following is an example of a gas-solid reaction?
- A) H₂ + O₂ → H₂O
- B) NaOH + HCl → NaCl + H₂O
- C) C + O₂ → CO₂
- D) Ag₂O → Ag + O₂
Answer: C) C + O₂ → CO₂
- What is the oxidation state of sulfur in H₂SO₄?
- A) +4
- B) +6
- C) -2
- D) 0
Answer: B) +6
- In which reaction is heat absorbed?
- A) Exothermic reaction
- B) Endothermic reaction
- C) Combustion reaction
- D) Redox reaction
Answer: B) Endothermic reaction
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