MDCAT XI Chemistry Covalent Bonds and shapes of Molecules Online Test-2

1. When two atoms of nitrogen bond with each other then

A.Potential energy is increased

B. Kinetic energy is lowered

C. Electronic motion ceases

D. Potential Energy is decreased.

2. If we Consider the dipole movement of CO2 from center to right side is x, then the dipole movement from cnter to left side is
A. x
B. -x
C. 0.5x
D. - 0.5 x

3. Which of the following has highest dipole movement

A. HI

B. HCL

C.HBr

D.H2S

4. The feasibility of chemical reaction is determined by the

A. Information of bond energy

B. Dipole movement

C. Nature of bonding atom

D. Chemical reaction

5. When benzene put in water
A. It dissolves and form two layer
B. It dissolves and form three layers
C. It dissolves and form one layer
D. None of these

6. For diatomic molecule dipole movement depends upon

A. Polarity

B. Geometry

C. State of atom

D . A and B

7. Which of the following has most ionic character

A. HCl

B.HBr

C.HI

D. OH

8. Choose the correct value of debye
A.I Debye = 10^ 18 esu cm
B.1 Debye = 3.336×10^-30 C cm
C.1 Debye= 10^-18esu cm
D. C and D

9. Half of bond length if Cl-Cl bond is:

A. 1.99 A°

B. 1.27 A°

C. 0.995A°

D. 0.663A°

10. Which of the following molecule is V-shaped
A.BeCl2
B. HgCl2
C. H2O
D. CO2

11. Which option shows all the molecules with bond angle 109.5°?

A.CH4, CCl4, NH3

B. SiCl4, H2O, BeCl2

C.CH4, NH4, PH3

D. SiCl4, NH4+,CH4

12. PCl3 has _______ shape

A. Planar

B. Pyramidal

C. Tetrahedral

D. Linear

13. The octet rule is not valid for the molecule

A.CO2

B.H2O

C.O2

D.CO

14. CCl4 is insoluble in water because

A.CCl4 is nonpolar and water is polar

B.water is nonpolar and CCl4 is polar

C.water and CCl4 are both polar

D.none

15. The breaking of a covalent bond in such a way that each atom separates with one electron of the shared pair is called __________

a) Homolytic fission

b) Heterolytic fission

c) Monolytic fission

d) Morpholytic fission

16. Which is not characteristic of pi bond

a. bond is formed when a sigma bond already exist.

b. bond are formed from hybrid sp orbitals.

c. bond may be formed by the parallel overlapping of p-orbitals

d. a bond results from lateral overlap of atomic orbitals

17. Which of the following has zero dipole movement

A..BF3

B. NH3

C. NF3

D H20

18. In sp3 hybridization

A. All p-orbitals are involved

B. One s and 3 p-orbitals are involved

C. one p-orbital is involved

D. four p-orbitals are involved

19. Product of e and d gives

A. Dipole

B. Monopole

C.polarity

D. A and C

20. According to VESPR Model the geometry of molecule having 5 bond pair in outer most shell will be ?

A. Triangular

B. Square planner

C. Trigonal bipyramidal

D. Octahedral

21. Which of the following molecules have sp² hybridized carbon?

A. C2H6

B. C6H6

C. C2H2

D. CO2

22. Which correct about MOT?

(I) Atomic orbital of similar energies can combine to form molecular orbital.

(II) In N₂ molecule molecular orbital of sigma 2px has more energy than pi2py and pi 2pz.

(III) In O, molecule molecular orbital of sigma 2px has higher energy than pi 2py and pi 2pz.

(IV) Bond order maybe in fractional order.

A. I only

B. I , II

C. I, II and IV

D. I, II. III and IV

23. Which overlapping is more effective?

Which of the following is more effective when they are making bond

A. Lateral py-py overlapping

B. Axial s-s overlapping

C. Axial s-p overlapping

D. Axial p-p overlapping

24. The bond enthalpy of ___________ molecule is 435.8 kJ mol-1.

a) Hydrogen

b) Oxygen

c) Nitrogen

d) Helium

25. The pi-bond involves __________

a) axial overlapping

b) side-wise overlapping

c) end to end type of overlapping

d) head-on overlapping

26. The oxygen molecule is paramagnetic. It can be explained by

a) Resonance

b) Hybridisation

c) Valence bond theory

d) Molecular orbital theory

27. Find the molecule having the highest bond order

(a) O2+

(b) O2–

(c) O22-

(d) O2

28. Which of the following is not paramagnetic?

(a) CO

(b) N2+

(c) NO

(d) O2–

29. Which of the following pairs has the same bond order?

a) O2+, NO+

b) N2, O2

c) O2^-2, B2

d) NO, CO

30. Combination of two atomic orbitals results in the formation of two molecular orbitals namely _________

a) one bonding and one non-bonding orbital

b) two bonding orbitals

c) two non-bonding orbitals

d) two bonding and non-bonding orbitals

31. Stability increases, as the energy ___________

a) increases

b) doesn’t change

c) decreases

d) increases and then decreases

32. Which of the following is a condition for the combination of atomic orbitals?

a) Combining atomic orbitals need not have equal energy

b) Combining atomic orbitals must have symmetry as per molecular axis

c) Combining atomic orbitals must overlap to a minimum extent

d) For combining atomic orbitals, X-axis should be taken as a molecular axis

33. What’s the bond order of Oxygen?

a) 3

b) 2

c) 1

d) 0

34. What do you think is the relationship between bond order and bond length?

a) Directly proportional

b) Indirectly proportional

c) No relation

d) Cannot predict

35. Which of the following statements is TRUE for Molecular Orbital Theory (MOT)?

(A) Molecular orbitals are localized between atoms

(B) Atomic orbitals lose their identity in molecular orbitals

(C) Only sigma bonds are explained by MOT

(D) MOT does not explain bonding in homonuclear diatomic molecule

36. In VBT, what type of overlap forms a sigma bond?

(A) Side-to-side overlap

(B) End-to-end overlap

(C) Overlap of d orbitals

(D) No overlap is needed

37. What is the key assumption of Valence Bond Theory (VBT)?

(A) Atomic orbitals combine to form molecular orbitals

(B) Bonds are formed by the overlap of atomic orbitals

(C) Electrons are delocalized over the entire molecule

(D) Molecules cannot exist without hybridization

38. Choose the best which has lowest bond angle

A. NH3

B. AsH3

C. PH3

D. SbH3

39. Bond angle of NF3 is
A. 107
B. 105
C. 102
D. 101

40. How many active electron are present in C02

A.22

B. 20

C. 18

D..16

41. If the shape of SF6 is octahedral the hybridization is

A. Sp3

B.sp3d2F1

C. Sp3d2

D. Sp3d2f2

42. Which of the following has maximum attraction

A. Bond pair to bond pair

B. Bond to lone pair

C. Lone to lone pair

D. None of these

43. Lewis introduce the concept of

A Hybridization

B.Paramagnetic behaviour

C. Valancy

D. Stability of molecule

44. Intramolecular Force of attraction that holds HCL molecules is

A. Ionic bond

B. Covalent bond

C.Dipole Dipole interaction

D. Hydrogen bond

45. Dipole movement of trans 2 butene is

A. 1.5D

B. 1.45D

C. 0.3D

D. 0 D

46. Which hybridization favours max EN

A. Sp3

B. Sp2

C. sp

D. All favours same

47. VBT does not describe

A. Shape

B. Strength

C. Bond length

D. Bond energy

E. None of these

48. Pick the best having lowest angle

A. H20

B. H2S

C. NH3

D. CH4

49. Percentage of ionic character is hinted by

A. Electro negativity

B. Ionization energy

C. Dipole moment

D. Bond stability

50. Hybridization of C2H2 is

A. Sp2

B. Sp3

C. Sp

D. Spd