Question

Which of the following is not a combination reaction 
→CaO(s)+H₂O(l) → Ca(OH)₂(aq)
→C(s)+O₂(ɡ) → CO₂(ɡ)
→2H₂(ɡ)+O₂(ɡ) → 2H₂O(l)
→Zn(s) + CuSO₄(aq ) → ZnSO₄(aq) + Cu(s)​

Answer 1

Answer:

A combination reaction is the one in which two elements or compounds combine to form a single compound.

Sooo..... as you can see in the 4th reaction two compounds are formed instead of one. So, the 4th one is not a combination reaction.

HOPE IT HELPS YOU

Answer 2

Answer:

the 4th one is not a combination reaction

1st; 2nd ;3rd are combination reaction because in those reactions two reactants are combining to give one product

The fourth one is a displacement reaction not combination