Rub the magnet on the iron an it will cause a stronger force of attraction. Hope this helped!
The answer would be A. You cannot decrease mass because of increasing temp so it can't be C and adding neutrons or protons would be changing the atom and therefore the element, and that is not possible through just an increase of temperature, so it can't be B or D. Hope this was helpful! ;)
Aluminium nitrate is acidic as its made by a weak base with a relatively stronger acid.
Hope that helps ;)
