Question

Which of the following are decomposition reactions? Can be multiple.

A. K2CO3 (s) → K2O (s) + CO2 (g)
B. 2Na (s) + Cl2 (g) → 2NaCl (s)
C. 2SO3 (g) → 2SO2 (g) + O2 (g)
D. 2LiOH (s) + CO2 (g) → Li2CO3 (s) + H2O (l)

Answer 1

I think its B only

Answer 2

A and C. Decomposition means you take one substance (a compound) and break it down into two things. Hope this helps :)