Find the number of complexes which satisfy at least three of the following four conditions : (a) Primary valence=3 Secondary valence=6 Oxidation number of central atom lt +3 Number of ions per molecule gt 3 I. [Pt(NH_(3))_(4)][PtCl_(6)],""II. [Co(NH_(3))_(6)]Cl_(3), III. [Co(NH_(3))_(5)(OH_(2))]Cl_(3),""IV. [Pt(NH_(3))_(6)]Cl_(4), V. K[PtCl_(5)(NH_(3))],""VI. [CoCl_(2),(en)_(2)]^(+), VII. [Ni(CO)_(4)],""VII. [Co(EDTA)]^(-)

Find the number of complexes which satisfy at least three of the follo

1.	Find the number of complexes which satisfy at least three of the following four conditions : (a) Primary valence=3 Secondary valence=6 Oxidation number of central atom lt +3 Number of ions per molecule gt 3 I. [Pt(NH_(3))_(4)][PtCl_(6)],""II. [Co(NH_(3))_(6)]Cl_(3), III. [Co(NH_(3))_(5)(OH_(2))]Cl_(3),""IV. [Pt(NH_(3))_(6)]Cl_(4), V. K[PtCl_(5)(NH_(3))],""VI. [CoCl_(2),(en)_(2)]^(+), VII. [Ni(CO)_(4)],""VII. [Co(EDTA)]^(-)
Answer» SOLUTION :(II),(III) and (IV) SATISFY at LEAST.