1. which of the following reactions are metathesis reactions?
(a) 2kcio3 - 2kci+ 302
(b) cu(no3)2 + zn -> cu + zn(no3)2
(c) baco3 + 2 hcl → bacl2 + h2o + co2
(d) na2co3 + cuso4 → na2so4 +cuco3
..1

The reaction; Na2CO3 + CuSO4 → Na2SO4 + CuCO3 is a metathesis reaction.

A metathesis reaction is a reaction in which chemical species in on the reactants side exchange partners on the product side. All the cations on the left hand side of reaction equation get new partners on the right hand side of the reaction equation.

In the reaction; Na2CO3 + CuSO4 → Na2SO4 + CuCO3, we can see that sodium ions and copper II ions on the left hand side of the reaction equation all got new partners on the right hand side of the reaction equation. This is a metathesis reaction. It is also called double decomposition or double replacement reaction.

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(d) Na₂CO₃ + CuSO₄  →  Na₂SO₄ + CuCO₃

Explanation:

Chemical reaction:

Na₂CO₃ + CuSO₄  →  Na₂SO₄ + CuCO₃

This is metathesis reaction. It is also called double displacement reaction. The cation and anions of both reactants exchange with each others.

The cation (Na⁺) of sodium carbonate is exchange with cation (Cu²⁺) of copper sulfate and form sodium sulfate and copper carbonate.

Double replacement:

It is the reaction in which two compound exchange their ions and form new compounds.

AB + CD → AC + BD