CHEMICAL BONDING- MCQ Test

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1. Which of the following pairs of d – orbitals will have electron density along the axes?

4 points

a. dz2 , dxz

b. dxz, dyz

c. dz2 , dx2-y2

d. dxy , dx2-y2

Clear selection

2. A hybrid orbital formed from s-and p-orbital can contribute to:

4 points

Sigma bond only

pi bond only

either sigma or pi bond

None of these

Clear selection

3. Which d orbital is involved in dsp2 hybridisation?

4 points

dx2-y2

dz2

dxy

dyz

Clear selection

4. Which d orbital is involved in sp3d hybridised mole ule like PCl5?

4 points

dx2-y2

dz2

dxy

dxz

Clear selection

5. Let y axis is internuclear axis.Which orbital will form sigma bond?

4 points

py-py

pz-pz

px-px

none

Clear selection

6. In sp3d , which bond is weaker?

4 points

axial

equatorial

dpi-p pi

none

Clear selection

7. The hybridisation of Be in BeH2 (s) is

4 points

sp2

sp3

none

Clear selection

8. The d orbital involved in the hybridisation in PCl3 molecule is

4 points

3dx2-y2

3dz2

3dxz

4dx2-y2

Clear selection

9. Which one of the following has sp2 hybridisation ?

4 points

CO2

SO2

N2O

Clear selection

10.Which of the following possess high Dipole moment :

4 points

OCS

OCO

SCS

All possess zero Dipole moment.

Clear selection

11. In which of following molecule the overall bond moments are cancelled by lone pair moments.

4 points

H2O

NH3

trans-N2F2

None of these

Clear selection

12. Which of the set of species have same hybridisation state but different shapes:-

4 points

NO2 + , NO2 , NO2 –

ClO4 – , SF4 , XeF4

NH4 + , H3O+ , OF2

SO4 –2, PO4 –3, ClO4 –

Clear selection

13. In compounds X, all the bond angles are exactly 109°28'. X is :

4 points

Chloromethane

Carbon tetrachloride

Iodoform

Chloroform

Clear selection

14.Arrange followings in the order of C - C Bond Energy :

4 points

Cyclohexane > Benzene > Hexa-1,2,3,4,5-pentadiene

Benzene > Hexa-1,2,3,4,5-pentadiene > Cyclohexane

Hexa-1,2,3,4,5-pentadiene > Cyclohexane > Benzene

Hexa-1,2,3,4,5-penta diene > Benzene > Cyclohexane

Clear selection

15.Which of the following represent zero overlap :

4 points

px-px

s-pz

pz-pz

px-py

Clear selection

16.which of the following represent sigma bond formation :

4 points

s-px

px-px

pz-py

s-s

Clear selection

17.Number of Covalent bonds in benzene are

4 points

Clear selection

18. Which of the followings are isostructural :

4 points

BF3 & :NF3

CCl4 & :SF4

XeF4 & CH4

:NH3 & :NF3

19. Ionic reactions are fast because :

4 points

Low Threshold energy

Ionic compounds are already dissociated in the form of ion.

due to low enthalpy of atomisation

All of the above

Clear selection

20.In which of the following central atom does not use sp3 hybrid orbitals in its bonding ?

4 points

BeF3 -

OH3 +

NH2 -

NH3

Clear selection

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