Is producing gunpowder at home illegal?
Making explosives is illegal. Whether making gunpowder is legal probably depends on your local ordinances. It also might depend on the amount.I am not a lawyer and this is not legal advice.
Nope. You can buy kits from, i think its called skylight.com, to make gun powder.
Might not be illegal, but if an officer happens to be in your house and sees what you are doing he might investigate it.
Yes and this may land you in jail for terrorist activity.