Coordination Compounds

Iron carbonyl, Fe(CO)5 is

1. tetranuclear
2. mononuclear
3. trinuclear
4. dinuclear

An example of a sigma bonded organometallic compound is

1. Grignard's reagent
2. ferrocene
3. cobaltocene
4. ruthenocene.

The correct order of the stoichiometries of AgCl formed when AgNO3 in excess is treated with the complexes : CoCl3 6NH3, CoCl3 5NH3, CoCl3 4NH3 respectively is

1. 3AgCl, 1AgCl, 2AgCl
2. 3AgCl, 2AgCl, 1AgCl
3. 2AgCl, 3AgCl, 2AgCl
4. 1AgCl, 3AgCl, 2AgCl

Correct increasing order for the wavelengths of absorption in the visible region for the complexes of Co3+ is

1. [Co(H2O)6]3+, [Co(en)3]3+, [Co(NH3)6]3+
2. [Co(H2O)6]3+, [Co(NH3)6]3+, [Co(en)3]3+
3. [Co(NH3)6]3+, [Co(en)3]3+, [Co(H2O)6]3+
4. [Co(en)3]3+, [Co(NH3)6]3+, [Co(H2O)6]3+

Pick out the correct statement with respect to [Mn(CN)6]3-.

1. It is sp3d2 hybridised and tetrahedral.
2. It is d2sp3 hybridised and octahedral.
3. It is dsp2 hybridised and square planar.
4. It is sp3d2 hybridised and octahedral.

Which of the following has longest C-O bond length? (Free C-O bond length in CO is 1.128 Å.)

1. [Fe(CO)4]2-
2. [Mn(CO)6]+
3. Ni(CO)4
4. [Co(CO)4]-

The correct increasing order of trans-effect of the following species is

1. NH3 > CN- > Br- > C6H5-
2. CN- > C6H5- > Br- > NH3
3. Br- > CN- > NH3 > C6H5-
4. CN- > Br- > C6H5- > NH3

Jahn-Teller effect is not observed in high spin complexes of

1. d7
2. d8
3. d4
4. d9

The hybridization involved in complex [Ni(CN)4]2- is (At. No. Ni = 28)

1. sp3
2. d2sp2
3. d2sp3
4. dsp2

The name of complex ion, [Fe(CN)6]3- is

1. hexacyanitoferrate (III) ion
2. tricyanoferrate (III) ion
3. hexacyanidoferrate (III) ion
4. hexacyanoiron (III) ion.

The sum of coordination number and oxidation number of the metal M in the complex [M(en)2(C2O4)]Cl (where en is ethylenediamine) is

1. 6
2. 7
3. 8
4. 9

Number of possible isomers for the complex [Co(en)2Cl2]Cl will be (en = ethylenediamine)

1. 1
2. 3
3. 4
4. 2

Cobalt (III) chloride forms several octahedral complexes with ammonia. Which of the following will not give test for chloride ions with silver nitrate at 25 ?

1. CoCl3 5NH3
2. CoCl3 6NH3
3. CoCl3 3NH3
4. CoCl3 4NH3

Which of these statements about [Co(CN)6]3- is true?

1. [Co(CN)6]3- has four unpaired electrons and will be in a high-spin configuration.
2. [Co(CN)6]3- has no unpaired electrons and will be in a high-spin configuration.
3. [Co(CN)6]3- has no unpaired electrons and will be in a low-spin configuration.
4. [Co(CN)6]3- has four unpaired electrons and will be in a low-spin configuration.

Among the following complexes the one which shows zero crystal field stabilization energy (CFSE) is

1. [Mn(H2O)6]3+
2. [Fe(H2O)6]3+
3. [Co(H2O)6]2+
4. [Co(H2O)6]3+

Which of the following complexes is used as an anticancer agent?

1. mer-[Co(NH3)3Cl3]
2. cis-[PtCl2(NH3)2]
3. cis-K2[PtCl2Br2]
4. Na2CoCl4

A magnetic moment of 1.73 BM will be shown by one among the following

1. TiCl4
2. [CoCl6]4-
3. [Cu(NH3)4]2+
4. [Ni(CN)4]2-

An excess of AgNO3 is added to 100 mL of a 0.01 M solution of dichlorotetraaquachromium(III) chloride. The number of moles of AgCl precipitated would be

1. 0.003
2. 0.01
3. 0.001
4. 0.002

Crystal field splitting energy for high spin d4 octahedral complex is

1. -1.2 o
2. -0.6 o
3. -0.8 o
4. -1.6 o

In a particular isomer of [Co(NH3)4Cl2]+, the Cl-Co-Cl angle is 90 , this isomer is known as

1. optical isomer
2. cis-isomer
3. position isomer
4. linkage isomer.

The anion of acetylacetone (acac) forms Co (acac)3 chelate with Co3+. The rings of the chelate are

1. five membered
2. four membered
3. six membered
4. three membered.

The correct IUPAC name for [CrF2(en)2]Cl is

1. chloro difluorido ethylene diaminechromium (III) chloride
2. difluoridobis (ethylene diamine) chromium (III) chloride
3. difluorobis-(ethylene diamine) chromium (III) chloride
4. chloro difluoridobis (ethylene diamine) chromium (III)

Which among the following is a paramagnetic complex?

1. [Co(NH3)6]3+
2. [Pt(en)Cl2]
3. [CoBr4]2-
4. Mo(CO)6

Which is diamagnetic?

1. [Co(F)6]3-
2. [Ni(CN)4]2-
3. [NiCl4]2-
4. [Fe(CN)6]3-

Low spin complex of d6-cation in an octahedral field will have the following energy

1. -125 o + P
2. -125 o + 3P
3. -25 o + 2P
4. -25 o + P

Red precipitate is obtained when ethanol solution of dimethylglyoxime is added to ammoniacal Ni(II). Which of the following statements is not true? [figure]

1. Red complex has a square planar geometry.
2. Complex has symmetrical H-bonding.
3. Red complex has a tetrahedral geometry.
4. Dimethylglyoxime functions as bidentate ligand.

Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour?

1. [Ni(NH3)6]2+
2. [Zn(NH3)6]2+
3. [Cr(NH3)6]3+
4. [Co(NH3)6]3+

Which of the following carbonyls will have the strongest C–O bond?

1. Cr(CO)6
2. Fe(CO)5
3. [Mn(CO)6]+
4. [V(CO)6]-

Which of the following complex compounds will exhibit highest paramagnetic behaviour? (At. No. Ti = 22, Cr = 24, Co = 27, Zn = 30)

1. [Cr(NH3)6]3+
2. [Co(NH3)6]3+
3. [Zn(NH3)6]2+
4. [Ti(NH3)6]3+

Of the following complex ions, which is diamagnetic in nature?

1. [NiCl4]2-
2. [Ni(CN)4]2-
3. [CuCl4]2-
4. [CoF6]3-