Me im stuck on

if mnso4 -> mno +so3 is not a synthesis reaction, then what type of reaction is it?

MnSO₄  →  MnO +SO₃

The type  of reaction above is   decomposition reaction

Explanation

Decomposition  reaction is type  of chemical  reaction  that involve breaking  down  of  a compound into smaller  compounds  or individual elements.

MnSo₄  is  broken down into  MnO and SO₃  therefore the reaction above  is a decomposition reaction.

On the other  hand synthesis  reaction is chemical reaction that involve   two  or more elements or compounds  which combine  to  form a single  product.

it should be all of them because it asks if you included all of those in your answer

explanation: