2013 Liaoning College Entrance Examination General Question 10 Option A 2Fe+6H*=2Fe3 3H2 Why is it wrong? Why is D right?

2013 Liaoning College Entrance Examination General Question 10 Option A 2Fe+6H*=2Fe3 3H2 Why is it wrong? Why is D right?

The substitution reaction of Fe gives ferrous iron, but not high iron.

The substitution reaction of Fe ferrous iron, but not high iron.

The reaction equations of iron ion, cobalt ion, nickel ion, copper ion and concentrated ammonia water are given respectively

Fe2++2NH3.H2O==2NH4++Fe (OH)2
Fe3++3NH3.H2O==3NH4++Fe (OH)3
Co2++6NH3.H2O==[ Co (NH3)6]2++6H2O
Co3++6NH3.H2O==[ Co (NH3)6]3++6H2O
Ni2++6NH3.H2O==[ Ni (NH3)6]2++6H2O
Cu++2NH3.H2O==[ Cu (NH3)2]++2H2O
Cu2++2NH3.H2O==[ Cu (NH3)2]2++2H2O