The number of antibonding electron pairs in O2

2 – ion on the basis of molecular orbital theory is: (At. No. of O-atom is 8)

1) 5 2) 4

3) 3 4) 2

[CET – 07]

For a stable molecule, the value of bond order must be:

1) zero

2) positive

3) negative

4) there is no relation between stability and bond order

[CET – 07]

[AIEEE – 06]

Which of the following is diamagnetic?

1) O2 2) O2 2 –

3) B2 4) N2+

[CET – 06]

Which of the following is diamagnetic?

1) H2+ 2) O2

3) Li2 4) He2+

[CET – 06]

Which of the following has the highest bond order?

1) N2 2) O2

3) He2 4) He2+

[COMEDK – 06]

Which of the following species has unpaired electrons?

1) N2 2) N22+

3) N22– 4) O2

2–

[AIEEE – 05]

Which of the following species is diamagnetic in nature?

1) He2+ 2) H2

3) H2+ 4) H2 –

[CET – 08]

A ligand can also be regarded as:

1)Lewis base 2) Bronsted acid

3) Lewis acid 4) Bronsted base

[CET – 08]

A complex compound in which the oxidation number of the metal is zero

1)[Ni(CO)4] 2) [Pt(NH3)4]Cl2

3) K4[Fe(CN)6] 4) K3[Fe(CN)6]

[CET – 07]

Which complex cannot ionize in water?

1) [CoCl3(NH3)3] 2) K4[Fe(CN)6]

3) K2[PtF6] 4) [Pt(NH3)6]Cl4

[CET – 07]

The oxidation state of iron in K4[Fe(CN)6] is

1) 1 2) 4

3) 3 4) 2

[CET – 07]

IUPAC name of Na3[Co(NO2)6] is

1) sodium hexanitritocobaltate (II)

2) sodium hexanitrocobalt (II)

3) sodium hexanitrocobaltate (III)

4) sodium cobaltinitrite

[CET – 07]

The number of unidentate ligands in the complex ion is called:

1) oxidation number 2) primary valency

3) coordination number 4) EAN

[COMED-K – 06]

Octahedral structure is shown by

1) nickel carbonyl

2) cuprammonium ion

3) ferrocyanide ion

4) argentocyanide ion

AIEEE 2009

Using MO theory predict which of the following species has the shortest bond length ?

1) O22+ 2) O2

+

3) O22– 4) O2

–

AIEEE 2009

IIT 2010

[CET – 06]

In which of the following complex ion, the central metal ion is in a state of sp3 d2 – hybridization

1) [CoF6]3– 2) [Co(NH2)6]3+

3) [Fe(CN)6] 3– 4) [Cr(NH2)6]3+

[CET – 06]

Which of the following can participate in linkage isomerism?

1)H2NCH2CH2NH2 2) NO2 –

3) NH3 4) H2O

CET 2009

CET 2009

CET 2009

[AIEEE – 05]

Which of the following compound shows lowest value of paramagnetic character?

1) [Co(CN6)]3 – 2) [Fe(CN)6]3–

3) [Mn(CN)6] 3– 4) [Cr(CN)6]3–