The statement that correctly describes the classification of chemical reactions into different categories is "All reactions fit into a category, and some reactions can fit into more than one category."
A chemical reaction is said to have occurred when the substances combine and form new substances. The substances that combined together are called reactant while the substance produced by such combination is called a product.
All reactions can be fitted into one category of the other depending on the kind of change that occur in the reaction.
However, some reactions fit more than one category. Let me give you an example. Look at the reaction; C(s) + O2 (g) ------> CO2(g).
This reaction can be viewed as a redox reaction since the oxidation numbers of the species involved in the reaction changed from left to right. On the other, we can also look at the reaction as a combustion reaction since it involves burning carbon in oxygen.
From this little example, we have seen that some reactions can fit into more than one category of reaction, hence the answer .
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