Rust itself is not toxic to humans. However, prolonged exposure to rust and its associated particles can cause skin irritation or cuts due to its abrasive nature. It is important to handle rusty materials with care to avoid injury.
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Rust is not toxic but it is disagreeable.
Ingesting rust itself would not typically result in death. However, if someone consumes a significant amount of rust that contains toxic substances or contaminants, there is a risk of poisoning which could potentially lead to death. It is important to seek medical attention if someone has ingested something potentially harmful.
Evapo-Rust is safe to use on car paint with rust spots. It is a non-toxic and non-corrosive rust remover that won't harm the paint when used properly. Just make sure to follow the instructions on the product label and rinse the treated area thoroughly after use.
Copper is mildly toxic to humans in large quantities. It's significantly more toxic to marine organisms and quite toxic to many plants. Other than that, copper carbonate isn't especialliy "dangerous".
Because the drum could rust through and release the chemicals, or be contacted by electricity and cause a fire...if you need to store toxic chemicals in a metal drum, you put a drum liner in first, and pour the chemicals into the liner. A drum liner is a very thick plastic bag.