Which of the following is a synthesis reaction?

Question

AgNO3 + NaCl → AgCl + NaNO3
PbCO3 → PbO + CO2
SO3 + H2O → H2SO4
Cu + AgNO3 → Ag + CuNO3

Answer 1

A synthesis reaction, also known as a combination reaction, is a type of chemical reaction in which two or more substances combine to form a single product.

Let's analyze the given reactions:

1. AgNO3 + NaCl → AgCl + NaNO3: This is a double displacement reaction, where ions exchange partners, not a synthesis reaction.

2. PbCO3 → PbO + CO2: This is a decomposition reaction, where a compound breaks down into simpler products, not a synthesis reaction.

3. SO3 + H2O → H2SO4: This is a synthesis reaction because sulfur trioxide and water combine to form a single product, sulfuric acid.

4. Cu + AgNO3 → Ag + CuNO3: This is a single displacement reaction, where copper displaces silver from silver nitrate, not a synthesis reaction.

Therefore, the synthesis reaction from the provided options is:

SO3 + H2O → H2SO4