Which of the statements are true about : Elements of group 13

Options

A. exhibit oxidation state of +3 only
B. form M and `M3^(+)` ions
C. exhibit oxidation states of +1 and +3
D. form `M^(-) and M^(+)` ions

Answer

C

Explanation

The stability of+1 oxidation state increases from aluminium to thallium and the stability of +3 oxidation state decreases from aluminium to thallium.