Question

Which phrase is not likely to indicate that a double-displacement reaction has occurred?

1) neutralization of acids and bases
2) formation of a precipitate
3) change of a metal ion to a metal element
4) formation of a gas

Answer 1

Formation of a gas is not likely to indicate that a double-displacement reaction has occurred.

Step-by-step explanation:

The phrase that is not likely to indicate that a double-displacement reaction has occurred is formation of a gas. Double-displacement reactions typically involve the exchange of ions between two substances in aqueous solutions. One of the products is usually a solid precipitate, a gas, or a molecular compound such as water. In the case of formation of a gas, a gas is produced as a product of the reaction, indicating that a different type of reaction, such as a gas-forming reaction, has occurred.