InterviewSolution
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InterviewSolution
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Pick out the correct statements from the following. (I) Cobalt (III) is more stable in octahedral complexes. (II) Zinc froms coloured ion or complexes. (III) Most of the d-block elements and their compounds are ferromagnetic. (IV) Osmium show (VIII) oxidation sate.A. I and IIB. I and IIIC. II and IVD. I and IV |
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Answer» Correct Answer - D (I) `Co^(3+)` have higher charge density than `Co^(2+), So Co^(3+)` is more stable in octahedral complexes. (II) Zn exhibits only `+2` oxidation state.So, `Zn^(2+)=[Ar]3d^(10),4s^(0)` Since, iy does not contain any unpaired electron, its compounds are colourless. (III) d-block elements are generally paramagnetic and sometime diamagnetic , but not ferromagnetic. (IV) Osmium and ruthenium are VIII group elements, so can exibit the highest oxidation state`+8` in their oxides, Hence, statements I and IV are correct. |
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