AnswersChemistryPractice ExamQuestion 30
30
practice examMultiple Choice

Practice Exam

Question 30 • Chemistry

Which equation is a decomposition reaction?

Answer
A
Li sub 2 CO sub 3 rightarrow Li sub 2 cap o plus CO sub 2
B
Na sub 2 cap o plus CO sub 2 rightarrow Na sub 2 CO sub 3
C
cap c sub 6 cap h sub 12 cap o sub 6 plus cap o sub 2 rightarrow CO sub 2 plus cap h sub 2 cap o
D
Zn plus HCl rightarrow ZnCl sub 2 plus cap h sub 2

Explanation

A decomposition reaction occurs when one compound breaks apart into two or more simpler substances. In choice B, Li₂CO₃ breaks down into Li₂O and CO₂, so it is a decomposition reaction. The other choices show substances combining or replacing one another.

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