The correct answer for the type of reaction that is not considered a redox reaction is option D. double displacement reaction.
One element from one compound is replaced by some other element from the other compound in a double replacement process. We can state that these processes do not actually transmit electrons, but rather just involve the recombination of ions. As a result, the elements' oxidation states remain unchanged.
Thus, double replacement reactions are not considered as redox reactions as there is no change in oxidation states, i.e., no oxidation and reduction- not a redox process.
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