If I buy BTX from an exchange can I receive 3% airdrop to an exchange account?
You will have to make sure that the exchange is indeed keeping that amount in the same address shown to you in your exchange wallet by cross checking the address in official BitCore explorer.. This is my assumption, but let the coin devs double confirm this here.
Sorry, no exchange ever does that. The coins are moved by scripts and aggregated to other wallets.
Btw, whoever said cryptopia has disabled withdrawals? They work just fine, I just withdrew