Question

which type of reaction is nacl + agno₃ → nano₃ + agcl?
synthesis
decomposition
oxidation
replacement

Explanation:

In the reaction \( \text{NaCl} + \text{AgNO}_3
ightarrow \text{NaNO}_3 + \text{AgCl} \), the positive ions ( \( \text{Na}^+ \) and \( \text{Ag}^+ \)) and negative ions ( \( \text{Cl}^- \) and \( \text{NO}_3^- \)) of the reactants exchange places to form new compounds. This is characteristic of a double - replacement (or just replacement in the given options) reaction. A synthesis reaction involves combining substances to form a more complex one (e.g., \( A + B
ightarrow AB \)), a decomposition reaction is the opposite ( \( AB
ightarrow A + B \)), and an oxidation reaction involves a change in oxidation state (which is not the case here as the oxidation states of \( \text{Na} \), \( \text{Ag} \), \( \text{Cl} \), and \( \text{N} \) remain the same).

Answer:

replacement (The reaction \( \text{NaCl} + \text{AgNO}_3
ightarrow \text{NaNO}_3 + \text{AgCl} \) is a double - replacement reaction, and among the given options, "replacement" is the correct choice as it represents the ion - exchange nature of the reaction.)