Question

The reactions in which new compounds are formed by exchange of ions, are called:

• A. Substitution reactions
• B. Double decomposition
• C. Addition reactions
• D. Dissociation

Hint:

In double decomposition reactions, the ions of two compounds are exchanged, often leading to the formation of a precipitate.

Answer 1

The Correct Option is B

Step 1: Understand double decomposition reactions.
In a double decomposition reaction, two compounds react by exchanging their ions to form new compounds. This reaction typically occurs in aqueous solutions. An example is when two salts in solution react to form a precipitate and a new ionic compound.
Step 2: Identify the other types of reactions.
- Substitution reactions: A chemical reaction where one atom or a group of atoms is replaced by another atom or group of atoms.
- Addition reactions: Involves two or more reactants combining to form a single product.
- Dissociation: Refers to the process where a compound breaks up into its ions in solution.
Step 3: Conclusion.
Thus, the correct type of reaction where new compounds are formed by the exchange of ions is double decomposition. Therefore, the correct answer is (B).