One mole of the complex CoCl3·6H2O on reaction with excess of AgNO3 gives two moles of white precipitate. Thus, the complex is:
a) [Co(H2O) 6]Cl3
b) [Co(H2O) 5Cl]Cl2·H2O
c) [Co(H2O) 4Cl2]Cl·2H2O
d) [Co(H2O) 3Cl3]·3H2O