Question

What is diffrence between exchange and replacemant ]?

Answer 1

You want to exchange the item you purchased. That is, you want to return to the store the one you bought and have the store give you a new one for one reason or another.

You want the store to replace it.

The clearest way to express this in American English is to say to the salesperson or service desk person:

I'd like to exchange this rug for a larger one (because it's too small for the space I want to put it in). [NB: The reason is optional unless you're asked for a reason.]

I'd like to exchange this space heater for a new one that works. When I tried to use this one that I bought here yesterday, it didn't work. Can we test the new one here before I take it home?

Answer 2

exchange means to take something from someone and give any other thing in return whereas replacement means to take something from a place or value and keep anotherone instead of it.