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Question:

The geometries of the ammonia complexes of Ni2+, Pt2+, and Zn2+, respectively, are:

Octahedral, tetrahedral and square planar

Square planar, octahedral and tetrahedral

Octahedral, square planar and tetrahedral

Tetrahedral, square planar and octahedral

Solution:

Ni2+ with NH3 shows Coordination Number = 6 forming [Ni(NH3)6]2+ (Octahedral)
Pt2+ with NH3 shows Coordination Number = 4 forming [Pt(NH3)4]2+ (Square planar)
Zn2+ with NH3 shows Coordination Number = 4 forming [Zn(NH3)4]2+ (Tetrahedral)
Therefore, the geometries of the ammonia complexes of Ni2+, Pt2+, and Zn2+ are Octahedral, Square planar, and Tetrahedral, respectively.