Question 23

Combination reactions form only one product.

Combination reactions are characterized by the fact that they involve two or more reactants that combine to form a single product.

A) Involve only one reactant.

This option is incorrect. Combination reactions specifically require two or more reactants to combine, not just one. A reaction involving only one reactant does not fit the definition of a combination reaction.

B) Involve an element and an ionic compound.

While some combination reactions may involve an element and an ionic compound, this statement is too specific and does not encompass all combination reactions. Therefore, it is not universally true for all combination reactions.

C) Form only one product.

This statement is true as it accurately describes combination reactions. These reactions always result in the formation of a single product from multiple reactants, which is the defining feature of this type of reaction.

D) Require oxygen gas.

This option is incorrect. Combination reactions do not inherently require oxygen gas; they can involve various types of reactants and do not need to include oxygen at all.

Conclusion

The correct statement regarding combination reactions is that they form only one product, which distinguishes them from other types of reactions. All other options either misrepresent the nature of combination reactions or fail to apply universally, confirming that option C is the definitive correct answer.