21.What is the highest possible oxidation state for manganese? A. +2 B. +4 C. +6

Question

21.What is the highest possible oxidation state for manganese?

A. +2 B. +4 C. +6 D. +7 E. +8

22. Due to the lanthanide contraction,

A. the atomic radius of tungsten is greater than that of molybdenum.

B. the atomic radius of tungsten is less than that of molybdenum.

C. the atomic radius of tungsten is about the same as that of molybdenum.

D. the density of tungsten is less than that of molybdenum.

E. the density of tungsten is about the same as that of molybdenum.

23.Which pair of compounds are ionization isomers?

(1) [CoCl(NH3)5]SO4 (2) [Co(NO2)(NH3)5]SO4 (3) [Co(SO4)(NH3)5]Cl (4) [Co(ONO)(NH3)5]SO4

A. (1) and (2) B. (3) and (4) C. (1) and (3) D. (2) and (4) E. (1) and (4)

24.Which pair of compounds are linkage isomers?

(1) [CoCl(NH3)5]SO4 (2) [Co(NO2)(NH3)5]SO4 (3) [Co(SO4)(NH3)5]Cl (4) [Co(ONO)(NH3)5]SO4

A. (1) and (2) B. (3) and (4) C. (1) and (3) D. (2) and (4) E. (1) and (4)

25.Which coordination complex is chiral?

A. [CoCl4(en)]2– D. [PtCl2(NH3)2]

B. trans–[CrCl2(en)2]+ E. None of these.

C. cis–[CrCl2(en)2]+

Explanation / Answer

21- D +7 [show oxidation state - 3 to +7]

22-C. the atomic radius of tungsten is about the same as that of molybdenum.

23-C. (1) and (3) [isomeric pairs occur that differ only in that two ionic groups exchange positions within (and without) the primary coordination sphere. These are called ionization isomers ]

24- D. (2) and (4) [ compounds that have the same composition differing with the connectivity of ligand to metal ]

25- cis–[CrCl2(en)2]+ [ is chiral ,has no plane of symmetry& it is opticaly active]

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