Question 1

The state of hybridization of the central atom and the number of lone pairs over the central atom in POCl3are[WB JEE 2012]Asp, 0

Bsp2, 0

Csp3, 0

Ddsp2, 1

Question 2

NiCl2{P(C2H5)2(C6H5)}2exhibits temperature dependent magnetic behaviour (paramagnetic/diamagnetic).The coordination geometries of Ni2+in the paramagnetic and diamagnetic states are respectively[IIT JEE 2012]Atetrahedral and tetrahedral

Bsquare planar and square planar

Ctetrahedral and square planar

Dsquare planar and tetrahedral

Question 3

When O2is converted into O2+[Karnataka CET 2011]Aboth paramagnetic character and bond order increase

Bbond order decreases

Cparamagnetic character increases

Dparamagnetic character decreases and the bond order increases

Question 4

Which one of the following conversions involve change in both hybridization and shape?[Karnataka CET 2010]ANH3NH4+

BCH4C2H6

CH2OH3O+

DBF3BF4

Question 5

Assuming that Hund's rule is violated, the bond order and magnetic nature of the diatomic molecule B2is[IIT JEE 2010]A1 and diamagnetic

B0 and diamagnetic

C1 and paramagnetic

D0 and paramagnetic

Question 6

Based on VSEPR theory, the number of 90 degree F Br F angles in BrF5is[IIT JEE 2010]A0

B2

C4

D8

Question 7

The species having pyramidal shapeis [IIT JEE 2010]ASO3

BBrF3

CSiO32

DOSF2

Question 8

The value of n in the molecular formula BenAl2Si6O18is[IIT JEE 2010]A3

B5

C7

D9

Question 9

Using MO theory predict which of the following species has the shortest bond length?[AIEEE 2009]AO2+

BO2

CO22

DO22+

Question 10

The number of nodal planes present in* s antibonding orbitals is[Karnataka CET 2008]A1

B2

C0

D3

Question 11

Which metal has a greater tendency to form metal oxide?[Karnataka CET 2008]ACr

BFe

CAl

DCa

Question 12

Which one of the following constitutes a group of the isoelectronic species?[AIEEE 2008]A

B

C

D

Question 13

Which one of the following pairs of species have the same bond order?[AIEEE 2008]ACNand NO+

BCNand CN+

CO2and CN

DNO+and CN+

Question 14

For a stable molecule the value of bond order must be[Karnataka CET 2007]Anegative

Bpositive

Czero

Dthere is no relationship between stability and bond order

Question 15

In acetylene molecule, between the carbon atoms there are[Karnataka CET 2007]Athree sigma bonds

Btwo sigma and one pi bonds

Cone sigma and two pi bonds

Dthree pi bonds