Pick out the correct statements from the following. (I) Cobalt (III) is more stable in octahedral complexes. (II) Zinc froms coloured ion or complexes
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 II
B. I and III
C. II and IV
D. I and IV
1 Answers
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.