The number of geometrical isomers found in the metal complexes [PtCl2(NH3)2], [Ni(CO)4], [Ru(H2O)3Cl3 and [CoCl2(NH3)4]+ respectively, are :

Question

The number of geometrical isomers found in the metal
complexes [PtCl₂(NH₃)₂], [Ni(CO)₄], [Ru(H₂O)₃Cl₃ and [CoCl₂(NH₃)₄]⁺ respectively, are :

1, 1, 1, 1