Question

He likes cakes . change into passive voice​

Answer 1

Question:

• He likes cakes . change into passive voice

Answer:

• Are cakes liked by him

Answer 2

Cake' as a single noun would seem to refer to cakes in general, whatever size and whatever type.

'Cakes' as a collective noun would seem to refer to smaller cakes, or cakes of a certain type.

However, you can really use either in whatever circumstance.