Question

Select the correct answer.

Which reaction is a decomposition reaction?

A.
2KClO3 → 2KCl + 3O2
B.
4Na + O2 → 2Na2O
C.
ZnS + 3O2 → 2ZnO + 2SO2
D.
2NaBr + CaF2 → 2NaF + CaBr2

Answer 1

Answer: 2KClO3 → 2KCl + 3O2

Explanation: Quite simple, it's the only one that was broken down into more parts than the start, the rest were simply reseperated

lets start with the other options

(B. 4Na + O2 → 2Na2O)

well that is 2 → 1, it's synthesis

(C. ZnS + 3O2 → 2ZnO + 2SO2)

this is a single replacement reaction because oxygen is replacing Zn and S in ZnS to form ZnO and plus SO₂.

(2NaBr + CaF₂ → 2NaF + CaBr₂) is a double replacement reaction because two ions (Br⁻ from NaBr and F⁻ from CaF₂) are exchanging places with other two ions (Na⁺ from NaBr and Ca²⁺ from CaF₂) two form two new ionic compounds (NaF and CaBr₂).

ALSO : I got it right