MDCAT XI Chemistry THEORIES OF CHEMICAL BONDING Online Test 2026

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Created on February 02, 2026 By

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MDCAT XI Chemistry THEORIES OF CHEMICAL BONDING Online Test 2026

📚 Test Details

Subject: Chemistry
Class: 1st year / XI
Chapter: THEORIES OF CHEMICAL BONDING
Test: 3
Book: Sindh Textbook
Total No. Of MCQs: 50 MCQs
Time Allowed: 50 Minutes
Price: Free

NameEmailPhone Number

1 / 50

1. Consider the following:
*I. F₂ has a single bond but is weak due to lone pair repulsion.*
*II. Cl₂ has a stronger bond than F₂ even though Cl is larger.*
*Which statement is correct?*

a) Only I is correct

b) Only II is correct

c) Both I and II are correct

d) Both I and II are incorrect

2 / 50

2. Which of the following statements is true regarding the difference between ionic and covalent bonding?

a) Ionic bonds are directional, covalent bonds are non-directional

b) Covalent bonds are directional, ionic bonds are non-directional

c) Both ionic and covalent bonds are directional

d) Both ionic and covalent bonds are non-directiona

3 / 50

3. What reaction corresponds with electron affinity?

a) A⁻(g) + e⁻ = A²⁻(g)

b) A(g) = A⁺(g) + e⁻

c) A(g) + e⁻ = A⁻(g)

d) A(g) = A⁻(g) + e⁻

4 / 50

4. What reaction corresponds with second ionization energy?

a) A⁺ = A²⁺ + e⁻

b) A = A⁺ + 2e⁻

c) 2A = 2A⁺ + 2e⁻

d) A = A⁺ + e⁻

5 / 50

5. Which one of the following statements best describes the enthalpy change of a reaction?

a) The energy released when chemical bonds are formed during a chemical reaction

b) The energy consumed when chemical bonds are broken during a chemical reaction

c) The difference between the energy released by bond formation and the energy consumed by bond cleavage during a chemical reaction

d) The increase in disorder of the system as a reaction proceeds

6 / 50

6. Dipole moment of NH₃ is greater than PH₃ due to:

a) Larger size of N

b) Higher electronegativity of N

c) Smaller bond angle

d) Weaker bonds

7 / 50

7. Which molecule shows maximum LP–LP repulsion?

a) NH₃

b) H₂O

c) XeF₄

d) SF₄

8 / 50

8. Which has odd number of electrons?

a) O₂

b) O₂⁻

c) O₂²⁻

d) O₂

9 / 50

9. Bond order of NO₂⁻ is approximately:

a) 1

b) 1.5

c) 2

d) 2.5

10 / 50

10. Which molecule contains coordinate + covalent bonds?

a) NH₃

b) H₃O⁺

c) O₂

d) Cl₂

11 / 50

11. H₂S is less polar than H₂O because of:

a) Smaller size of S

b) Lower electronegativity difference

c) Larger bond angle

d) sp hybridization

12 / 50

12. Which molecule shows maximum deviation from ideal bond angle?

a) CH₄

b) NH₃

c) H₂O

d) BF₃

13 / 50

13. The reason lone pair causes greater repulsion is because it:

a) Has higher mass

b) Occupies more space

c) Forms π bonds

d) Has lower energy

14 / 50

14. Which species has the same electron geometry but different molecular shape?

a) CH₄ & NH₄⁺

b) NH₃ & H₂O

c) BF₃ & SO₃

d) CO₂ & BeCl₂

15 / 50

15. Stability increases, as the energy:

a) increases

b) doesn’t change

c) decreases

d) increases and then decreases

16 / 50

16. 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

17 / 50

17. Which of the following statement is true regarding hybrid orbitals?

a) The amount of orbitals formed after the hybridization is not equal to the number of orbitals before hybridization

b) The hybrid orbitals don’t have equal energy

c) They can form more stable bonds than the pure orbitals

d) Hybridization doesn’t indicate geometry

18 / 50

18. Mention the types of orbitals that undergo hybridization in order to get octahedral geometry?

a) s‑orbital only

b) s‑orbital and p‑orbital

c) s‑orbital, p‑orbital, and d‑orbital

d) d‑orbital and p‑orbital

19 / 50

19. What type of hybridization does a BCl₃ molecule undergo?

a) sp

b) sp²

c) sp³

d) sp³d

20 / 50

20. Which has maximum bond angle distortion?

a) CH₄

b) NH₃

c) H₂O

d) PH₃

21 / 50

21. Dipole moment becomes zero when:

a) Bonds are non-polar

b) Shape is linear

c) Bond dipoles cancel

d) Lone pairs are absent

22 / 50

22. Which molecule shows resonance?

a) CH₄

b) NH₃

c) O₃

d) H₂O

23 / 50

23. Which species has trigonal bipyramidal electron geometry but different molecular shape?

a) PF₅

b) SF₄

c) BF₃

d) NH₄⁺

24 / 50

24. Hybridization of sulfur in SO₂ is:

a) sp

b) sp²

c) sp³

d) sp³d

25 / 50

25. What's the amount of lattice energy of NaCl?

a) 788 KJ mol⁻¹

b) 688 KJ mol⁻¹

c) 588 KJ mol⁻¹

d) 488 KJ mol⁻¹

26 / 50

26. What is the energy that is released upon the formation of an ionic compound known as?

a) Ionization energy

b) Lattice energy

c) Electron gain enthalpy

d) Electropositivity

27 / 50

27. Ionic bonds easily form when electron when ionization energy of the metallic atom is __________ comparatively.

a) negative

b) constant

c) more

d) less

28 / 50

28. Electron gain enthalpy may be:

a) exothermic

b) endothermic

c) both exothermic and endothermic

d) always zero

29 / 50

29. Which of the following have sp³ hybridization?

a) BF₃, NH₃

b) SF₄, BeH₂

c) H₂S, BF₃

d) NH₃, H₂O

30 / 50

30. XeF₄ has hybridization:

a) sp³

b) sp³d

c) sp³d²

d) sp²

31 / 50

31. Bond angles in SF₄ are approximately:

a) 90° & 120°

b) 102° & 173°

c) 109.5°

d) 180°

32 / 50

32. Reaction is exothermic when:

a) Bonds broken > bonds formed

b) Bonds formed > bonds broken

c) Both equal

d) Depends on catalyst

33 / 50

33. Coordinate bond is present in:

a) NH₃

b) NH₄⁺

c) H₂

d) NaCl

34 / 50

34. Which has highest lattice energy?

a) NaCl

b) MgO

c) KBr

d) CsI

35 / 50

35. Correct order of size is:

a) Na⁺ > Na > Na⁻

b) Na⁻ > Na > Na⁺

c) Na > Na⁺ > Na⁻

d) Na⁺ > Na⁻ > Na

36 / 50

36. How many orbitals are included in sp³d hybridization?

a) 5

b) 4

c) 3

d) 6

37 / 50

37. What is the shape of the molecule NH₃?

a) Square pyramidal

b) V‑shape

c) Trigonal pyramidal

d) Tetrahedral

38 / 50

38. The shape of the molecule depends on the:

a) adjacent atom

b) valence electrons

c) surroundings

d) atmosphere

39 / 50

39. Which of the following is correct regarding repulsive interaction?

a) Lone pair–Lone pair is greater than Lone pair–Bond pair is greater than Bond pair–Bond pair

b) Lone pair–Lone pair is less than Lone pair–Bond pair is less than Bond pair–Bond pair

c) Lone pair–Bond pair is greater than Lone pair–Lone pair is greater than Bond pair–Bond pair

d) Lone pair–Lone pair is greater than Lone pair–Bond pair is less than Bond pair–Bond pair

40 / 50

40. What is the electronic configuration of carbon in it's excited state?

a) 1s²2s²2p⁴

b) 1s²2s²2p³

c) 1s²2s¹2p⁵

d) 1s²2s¹2p³

41 / 50

41. 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

42 / 50

42. What's the bond order of Oxygen?

a) 3

b) 2

c) 1

43 / 50

43. Take Na as the number of Anti-bonding molecular orbitals and Nb as the number of Bonding molecular orbitals. The molecule is stable when Na __________ Nb:

a) is greater than

b) is equal to

c) is less than

d) is greater than or equal

44 / 50

44. Why BF₃ is planar while NH₃ is pyramidal?

a) Difference in electronegativity

b) Difference in atomic size

c) Presence of lone pair on nitrogen

d) π back bonding

45 / 50

45. Which species has square planar geometry?

a) XeF₄

b) SF₄

c) IF₅

d) PF₅

46 / 50

46. Which oxygen species is most stable according to bond order?

a) O₂

b) O₂⁺

c) O₂⁻

d) O₂²⁻

47 / 50

47. Which has zero dipole moment despite polar bonds?

a) NH₃

b) H₂O

c) SO₂

d) XeF₂

48 / 50

48. Which species has same number of bond pairs but different shape due to lone pairs?

a) CH₄ & NH₃

b) NH₃ & NH₄⁺

c) H₂O & H₂S

d) BF₃ & NH₃

49 / 50

49. Maximum deviation from ideal tetrahedral angle occurs in:

a) CH₄

b) NH₃

c) H₂O

d) NH₄⁺

50 / 50

50. Which statement best explains why covalent bonds are directional?

a) Equal sharing of electrons

b) Localization of electron density between atoms

c) Low melting points

d) Presence of lone pairs

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MDCAT XI Chemistry THEORIES OF CHEMICAL BONDING Online Test 2026

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