It depends.

Some are using the same addresses. Example is ethereum and Binance smart chain and some others. It will get processed. The exchanges have the coins. If the exchange support the blockchain you mistakenly sent to, you will be credited on the blockchain. But if ththe exchange doe lsnmit supportdoes not support the blockchain, you will not be credited but the exchange has the money. You can contact their customers care, maybe they can be of help. But prevention is better than cure.

About some blockchains that have different addresses, the exchange that you want to send the coin will most likely notify you. Even addresses like Aptos network which is similar, some exchanges will still notify you that it is invalid. But most importantly, do not send to a wrong blockchain.

It depends.

Some are using the same addresses. Example is ethereum and Binance smart chain and some others. It will get processed. The exchanges have the coins. If the exchange support the blockchain you mistakenly sent to, you will be credited on the blockchain. But if th exchange doe lsnmit support not, you will not be credited but the exchange has the money. You can contact their customers care, maybe they can be of help. But prevention is better than cure.

About some blockchains that have different addresses, the exchange that you want to send the coin will most likely notify you. Even addresses like Aptos network which is similar, some exchanges will still notify you that it is invalid. But most importantly, do not send to a wrong blockchain.