Question

How can one tell if a reaction is a redox reaction?

a. spectator ions are present.
b. elements change phases.
c. a precipitate is formed.
d. electrons are gained and lost.
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Answer 1

D.) electrons are gained and lost.

Step-by-step explanation:

Redox reactions involve the change in oxidation states of the reactants. Oxidized molecules lose electrons whereas reduced molecules gain electrons. In redox reactions, the oxidation number of oxidized molecules decreases and increases in reduced molecules.