Can you exchange a purchase 24 hrs?

This is all about Walmart Return Policy https://help.walmart.com/app/answers/detail/a_id/3228/~/returns%2C-replacements-and-refunds

Of course you can. If you have the receipt they will take it back. If no receipt, a store credit will be issued.

Definitely they have a very good return policy

Of course

Yes. As long as you have the receipt

Yes