• # question_answer 1) Standard electrode potential values, ${{E}^{{}^\circ }}$for $A{{l}^{3+}}/Al$is -1.66 V and that of$T{{l}^{3+}}/Tl$ is +1.26 V. Predict about the formation of ${{M}^{3+}}$ ion in solution and compare the electropositive character of the two metals.

Standard electrode potential values for two half cell reactions suggest that aluminium has high tendency to make$A{{l}^{3+}}$ ions whereas $T{{l}^{3+}}$ is unstable as it shows strong oxidising nature. Aluminium being able to form +3 ions easily, it is more electropositive than$Tl$.