155k views
4 votes
Which of the following is a combination reaction?

a. 2SO₂ + O₂ → 2SO₃

b. 2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O

c. 2H₂O₂ → 2H₂O + O₂

d. AgNO₃ + NaCl → AgCl + NaNO₃

1 Answer

4 votes

Final answer:

The combination reaction among the given options is 2SO₂ + O₂ → 2SO₃, as it is the only reaction where two reactants combine to form a single product. The correct option is a.

Step-by-step explanation:

To determine which of the given reactions is a combination reaction, we must identify the reaction in which two or more substances combine to form a single product. Let's analyze each one:

  • a. 2SO₂ + O₂ → 2SO₃ - This reaction features two reactants combining to form a single product, sulfur trioxide (SO₃), and is an example of a combination reaction.
  • b. 2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O - This is a combustion reaction where acetylene (C₂H₂) burns in the presence of oxygen to form carbon dioxide and water.
  • c. 2H₂O₂ → 2H₂O + O₂ - This reaction is a decomposition reaction because hydrogen peroxide (H₂O₂) decomposes into water and oxygen gas.
  • d. AgNO₃ + NaCl → AgCl + NaNO₃ - This is an example of a double displacement reaction, where ions in two compounds exchange partners.

From these options, the answer is a. 2SO₂ + O₂ → 2SO₃, as it is the only combination reaction according to the definition.

User Steven Sudit
by
8.0k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.