Al is used as reducing agent for the extraction of metals such as Chromium,Monganes.Explain whyyy???

Al³⁺ + 3 e^-  Al

Good reducing agents like aluminum have relatively small ionization energies and low electro-negativities by giving up electrons and reducing the elements like chromium and manganese. so the electrons froms the outer shell of the aluminium atoms easily come out with small energy itself thus making it effective for reducing many elements.