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251.

Which of the following complex is an outer orbital complex?A. `[Fe(CN)_(6)]^(4-)`B. `[Mn(CN)_(6)^(4-)`C. `[Co(NH_(3))_(6)]^(3+)`D. `[Ni(NH_(3))_(6)]^(2+)`

Answer» Correct Answer - 4
`Ni^(+2) - 3d^(8)` rearrangement of electron is not possible. So, hybridisation is `sp^(3)d^(2)`.
Discussion
252.

In metal carbonyls. There is synergic bonding interaction between metal and carbon monoxide . This leads to increase in strength of metal ligand bond and decrease in bond ordeer of CO in carbony1 complex as compared to band order in order in carbon monoxide. The increases in bond length in CO as compared to carbon monoxide .is due to :A. the donation of lone pair of electrons from a filled d-orbital of the metal atomB. the donation of pair of electrons from a filled d-orbital of metal into the vacant antibonding `pi^(*)` orbital of carbon monoxide.C. (A) and (B)D. None

Answer» (B), Donation of electrons from a filled d-orbital of metal into the vacant antibonding `pi^(**)` bonding orbital of CO decrease the bond other three to two and half or slightly more thus increasing the bond length between C-O.
Bond order `prop (1)/("Bond length")`
Discussion
253.

Chelates are used inA. Analytical chemistryB. Water softeningC. Removal of `Pb^(+2)` from the bloodD. All of these

Answer» Correct Answer - 4
For all chelates are used.
Discussion
254.

`[Pt(NH_(3))_(5)Cl]^(+)` does not exhibit _______________ and ____________ stereio isomersim .

Answer» Correct Answer - Geometrical and optical
Geometrical and optical.
Discussion
255.

In which of the following octahedral complexes of Co (at. no. 27), will the magnitude of `Delta_o` be the highest?A. `[Co(C_(2)O_(4))_(3)]^(3-)`B. `[Co(H_(2)O)_(6)]^(3+)`C. `[Co(NH_(3))_(6)]^(3+)`D. `[Co(CN)_(6)]^(3-)`

Answer» Correct Answer - 4
Strength of ligands : `C_(2)O_(4)^(-2) lt H_(2)O lt NH_(3) lt CN^(-)`
Discussion
256.

Among the following ions which one has the highest paramagnetism?A. `[Cr(H_(2)O)_(6)]^(3+)`B. `[Fe(H_(2)O)_(6)]^(2+)`C. `[Cu(H_(2)O)_(6)]^(2+)`D. `[Cu(H_(2)O)_(2)]^(2+)`

Answer» Correct Answer - 2
`(1) n=3" "(2) n=4" "(3) n=1" "(4) n=0`
Discussion
257.

What is spectrochemical series?A. `Cl_(-) lt F^(-) lt C_(2)O_(4)^(2-) lt NO_(2)^(-) lt CN^(-)`B. `CN^(-) lt C_(2)O_(4)^(2-) lt Cl^(-) lt NO_(2)^(-) lt F^(-)`C. `C_(2)O_(4)^(2-) lt F^(-) lt Cl^(-) lt NO_(2)^(-) lt CN_(-)`D. `F^(-) lt Cl^(-) NO_(2)^(-) lt C_(2)O_(4)^(2-)`

Answer» Correct Answer - 1
See Spectro chemical series.
Discussion
258.

Deduce the structures of `[NiCl_(4)]^(2-)` and `[Ni (CN)_(4)]^(2-)` considering the hybridisation of the metal ion. Calculate the magnetic moment (spin only) of the species.A. `sp^(3)`B. `dsp^(2)`C. `sp^(3)d`D. `sp^(3)d^(2)`

Answer» Correct Answer - 1
It is outer orbital complex. Coordination number is 4. Shape is tetrahedral
Discussion