Question

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

Explanation:

1. Analyze the reaction \( \text{NaCl} + \text{AgNO}_3

ightarrow \text{NaNO}_3 + \text{AgCl} \):

• In this reaction, the cations (\( \text{Na}^+ \) and \( \text{Ag}^+ \)) and anions (\( \text{Cl}^- \) and \( \text{NO}_3^- \)) of the two reactants exchange places to form two new compounds.
• A synthesis reaction involves combining substances to form a single product (e.g., \( A + B

ightarrow AB \)), which is not the case here.

• A decomposition reaction involves breaking down a compound into simpler substances (e.g., \( AB

ightarrow A + B \)), which is not what's happening here.

• Oxidation involves a change in oxidation states (loss of electrons), and there's no change in oxidation states for the elements here (Na is +1, Ag is +1, Cl is -1, N is +5, O is -2 throughout).
• A replacement (specifically double - replacement) reaction occurs when the ions of two compounds exchange places in an aqueous solution to form two new compounds. This matches the given reaction as \( \text{Na}^+ \) from \( \text{NaCl} \) pairs with \( \text{NO}_3^- \) from \( \text{AgNO}_3 \), and \( \text{Ag}^+ \) from \( \text{AgNO}_3 \) pairs with \( \text{Cl}^- \) from \( \text{NaCl} \).

Answer:

replacement