2Al³⁺ (aq) + 3 Mg⁰ (s) --> 3Mg²⁺ (aq) + 2Al⁰ (s)
Al³⁺ +3e⁻ ------> Al⁰
Al had positive charge and them it became neutral, that means that it took 3 negative particles (electrons). (+3-3=0)
We have 2 Al³⁺, and they take 3*2 =6 electrons
Mg⁰ -----> Mg²⁺ + 2e⁻
Mg was neutral atom, and them it became positive ion, that means it lost electrons . (0=+2-2)
We have 3Mg, and they loose 2*3=6 electrons.
Mg loose electrons, Al³⁺ takes electrons, that means that electrons are transferred from Mg to Al³⁺.
Answer is C).
