What will happen if i put colored toner in Black white laser printer cartridge

Yes it will print green. The machine doesn't really "sense" what exact color of ink is inside the cartridge, but some can read the sensor and see if it is the right catridge, however that means nothing if you put a different color in it yourself. It counts on the user to fill them and insert them correctly. It can sense the amount of ink left, however :)

The printer will use the toner you put into the cartridge, but the quality of output and what it does to your OPC drum and fuser will depend on whether the toner has the same characteristics as the regular black stuff for that printer. There is a risk of clogging up these parts and reducing their life if the toner is not fully compatible.