you can, but the results may not be exactly the same.
No.
yes
Yes you can but you need to melt it first to have the correct measurement. You can also use corn oil some people say it tastes alittle wierd in a cake but it doesnt to me.
the cake would be nasty and dry
Yes it can.
it won't work (at least it didn't work for me), the cake came out with a horrible texture... it looks more like a souffle, i bake some cupcakes and they are sooooooo heavy am guessing the margarine behaives different than oil
Baking-wise it will work,but the butter may taste better.
If the recipe calls for oil, any vegetable oil is fine, though I don't recommend olive oil for that - it's distinctive flavor will come through in the cake. But corn oil, safflower oil, canola oil, etc, are all fine.
Oil makes the cake more moist and dense. Otherwise, it would be a drier, fluffier cake.
Chiffon cake texture is supposed to be light, spongy and fluffy rather than that greasy and dense compare to regular cake because it is not an oil-based cake. You don't need to make the pan greasy with unnecessary fat.
corn oil is made out of germ of corn.