alleryStart learning →What happens in a single-displacement reaction?
ATwo ionic compounds exchange their partner ions
BAn element in free form is oxidized by an ion
CAn acid and a base give a salt plus water
DOne element both gains and loses its electrons
Answer & Solution
Correct answer: B. An element in free form is oxidized by an ion
1. Single displacement is a redox subclass, not an ion exchange.
2. An element in its free state is oxidized by an ionic species in solution.
3. Zn(s) plus 2HCl(aq) giving ZnCl2(aq) and H2(g) is one example.
4. Cu(s) plus 2AgNO3(aq) giving Cu(NO3)2 and Ag(s) is another.
5. Swapping partner ions with no change of oxidation number is double displacement instead.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 4 "Stoichiometry of Chemical Reactions", section 4.2 Classifying Chemical Reactions_
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