Home › WAEC WASSCE › Chemistry › Stoichiometry of Chemical Reactions › What happens in a single-displacement reaction?
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_
Related questions
In the reaction between sodium and chlorine, sodium is oxidised, which means chlorine:Ordering the three ways of writing a reaction from most to least detail about ions gives:When one element appears in more than one formula on the same side of an equation, you musWhen balancing a combustion equation, an odd number of oxygen atoms on the product side isCompounds that produce hydroxide ions by chemically reacting with water, rather than by diA double arrow is used in an acid equation to indicate that the acid is:A neutralisation reaction has an acid and a base as reactants and typically produces:Sodium hydroxide is classified as a strong base because in water it: