Which of the following statements is incorrect? complete combustion has occurred when all the carbon in the product is in the form of carbon dioxide. a single reactant is the identifying characteristic of a decomposition reaction. all chemical reactions can be classified as one of four general types. the only way to determine the products of a reaction is to perform the reaction.

option c) all chemical reactions can be classified as one of four general types

Explanation:

The incorrect statement is that all chemical reacctions can be classified as one of four general types. I can count, at least, 5  general types of reactions:

1) Synthesis or combination
2) Single-replacement
3) Double-replacement
4) Decomposition
5) Combustion

And that is a general clasiffication you cannot take account of all chemical reactions under that general classification.

About the other statements, note this that confirm their validity:

- Complete combustion has occurred when all the carbon in the product is in the form of carbon dioxide.

The complete combustion requires excess oxygen to yield transform the reactants into CO2 and water. So, this is correct.

A single reactant is the identifying characteristic of a decomposition reaction. Certainly, one example is KClO3. It decomposes at high temperatures yielding KCl and O2. The general scheme is A --> B + C.

The only way to determine the products of a reaction is to perform the reaction. Right. Although some predictions can be made from theory the only way to be certain is by performing the reaction, because the mechanism are unique and change with the conditions.

The correct answer would be 1. precipitation