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How many of the following coordination complexes give a positive test for chloride ion (i.e., have ionisable chloride outside the coordination sphere)? [CoCl6]³-, [Pt(NH3)4Cl2]Cl2, [PtCl4]²-, [Ni(NH3)6]Cl2, [Cr(ox)3]³-, [Pt(H2O)2Br2Cl2]
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- 2
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- 4
Correct answer: 2
Solution
Only [Pt(NH3)4Cl2]Cl2 and [Ni(NH3)6]Cl2 have ionisable Cl- outside the inner coordination sphere. All other complexes have Cl (if any) directly bonded to the metal inside the coordination sphere, so they do not give a chloride test.
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