Write the coordination number and oxidation state of the metal in the following compounds:
a) Li[AlH₄]
a) 4
b) 6
c) 2
d) 8
b) [Fe(NH₃)₆]SO₄
a) Coordination number: 4, Oxidation state: +2
b) Coordination number: 6, Oxidation state: +3
c) Coordination number: 5, Oxidation state: +3
d) Coordination number: 6, Oxidation state: +2