Can i buy stocks with my credit card?

You cannot use a credit card to pay for stock purchases. You can use the cash you can get from a credit card to pay for it, but brokerage firms do not accept credit cards.

102% yes.
You can get a cash advance and pay for the stock.
(I don't think traders use Mastercard or anything else but you can find a way around it using cash advance)

He got a cash advance on his credit card, at a stupidly high interest rate. Dumb move. He did not break a law. Brokerages don't take credit cards as payment on stocks. It's an option or a cash purchase. He is just really tragically stupid and has no business trading, for obvious reasons.

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Buying stock requires cash settlement within 3 days of you placing your buy order. A credit card is not accepted. You could get a cash advance from some credit cards to meet the cash settlement, deposit the cash in your checking account and pay for the stock with a check from that account.

Yes, but the credit card charge will be treated like a cash advance.

101% no

No.

if an exchange allows margin trading, it is possible.