Structure of Molecules – MCQ’s

(a) Duplet rule

(b) octet rule                ✓

(c) Both “A” and “B”

(d) None of these

3. The force of attraction which holds the molecule atom together is called

(a) Ionic bond

(b) Covalent bond

(c) hydrogen bond

(d) Chemical bond   ✓

4. Every atom tries to attain

(a) Maximum energy

(b) Stable energy

(c) Minimum energy      ✓

(d) Covalent energy

5. Which force of attraction is present between positive and negative ions?

(a) Homolytic

(b) Electrostatic          ✓

(c) Electro elastic

(d) Electronic

6. A bond formed by the complete transfer of electron from one atom to other is called

(a) Chemical bond

(b) Covalent bond

(c) Ionic bond             ✓

(d) metallic bond

7. Hydrogen acquires the electronic configuration like

(a)Xe

(b) Ne

(c) He                    ✓

(d) Ar

8. In non polar covalent bond the bonded atoms share the electrons

(a) Not equally

(b) Equally             ✓

(c) Differently

(d) Oppositly

9. In polar covalent bonds molecules are

(a) Homo atomic

(b) Tri atomic

(c) Hetero atomic        ✓

(d) Mono atomic

10. Dipole-dipole interactions are

(a) Magnetic

(b) Electric

(c) Neutral            ✓

(d) Stable

11. Energy requires to break forces of one mole liquid HCl molecule is

(a) 16kJ

(b) 15kJ

(c) 17kJ             ✓

(d) 18kJ

12. The density of ice at 0^oC is

(a) 0.917 gcm^-3          ✓

(b) 0.719 gcm^-3

(c) 0.197 gcm^-3

(d) 0.0917 gcm^-3

13. One form of polymer used industrially as a adhesive

(a) Epoxy                    ✓

(b) Explosive

(c) Synthetic

(d) Natural

14. Epoxy is a polymer formed by the resin and

(a) Shiner

(b) Softener

(c) Hardener

(d) Thiner   ✓

15. Substance have the tendency to gain electrons and anions

(a) Metals

(b) Non-metals

(c) Metalloids

(d) Halogens   ✓

16. Which properties are affected by hydrogen bonding

(a) Physical                  ✓

(b) Chemical

(c) Ionic

(d) Metallic

17. Which scientist had given the idea of octaves in periodic table?

(a) Mendeleev

(b) Al-razi

(c) Newland          ✓

(d) Dobereiner

18. Covalent bond involves the

(a) Donation of electrons

(b) Acceptanee of electrons

(c) Sharing of electrons                     ✓

(d) Repulsion of electrons

19. Triple covalent bond involves how many numbers of electrons?

(a) Eight

(b) Six              ✓

(c) Four

(d) Only three

20. Which one of the following is an electron deficient molecule?

(a) NH₃

(b) BF₃   ✓

(c) N₂

(d) O₂

21. Which one of the following is the weakest force among the atoms?

(a) Ionic force

(b) Metallic force

(c) Intermolecular force   ✓

(d) Covalent force

22. Which atom after losing one electrons attains electronic configuration of noble gas.

(a) He

(b) Ne

(c) Ar   ✓

(d) Na

23. How many electrons are there in the outer most shell of Cl-atom after it gains one electron in its values shell?

(a) 6

(b) 7

(c) 8   ✓

(d) 10

24. Which ionic species has same electronic configuration as noble gas Ar.

(a) Na⁺

(b) K⁺

(c) Cl^–   ✓

(d) Both (b) and (c)

25. An ionic bond is formed when elements of group 1 react with elements of group:

(a) 12

(b) 14

(c) 18

(d) 17   ✓

26. A dative bond is formed between ammonia and borontrifluoride the donar atom is:

(a) Fluorine

(b) Boron

(c) Hydrogen

(d) Nitrogen   ✓

27. Indicate which molecule is non-polar:

(a) NaCl

(b) KBr

(c) CO₂   ✓

(d) Kl

28. Mark the molecule which possess four covalent bonds.

(a) N₂

(b) C₂H₄

(c) CH₄   ✓

(d) C₂H₂

29. Which one of molecule is maximum polar:

(a) HCl

(b) HF   ✓

(c) NaF

(d) H₂O

30. Electronegativity difference between hydrogen and chlorine is:

(a) 1.7

(b) 0.8

(c) 1.0   ✓

(d) 0.5

31. Indicate which of the following has hydrogen bonding:

(a) C₂H₆

(b) CH₄

(c) NH₃   ✓

(d) HCl

32. Is², 2s², 2p² is the electronic configuration of which atom.

(a) Li

(b) B

(c) N

(d) C   ✓

33. Identify the compound which is soluble in water:

(a) C₆H₆

(b) CH₄

(c) C₂H₄

(d) NaCl   ✓

34. The bond dissociation energy of H–Cl molecule

(a) 430 kj/mole   ✓

(b) 340 kj/mole

(c) 403 kj/mole

(d) 304 kj/mole

35. On the pauling scale fluorine has been given an electronegative value of:

(a) 2.5

(b) 3.0

(c) 3.5

(d) 4.0   ✓

36. The density of ice at 0°C is:

(a) 0.917g cm^-3   ✓

(b) 1.0 gcm^-3

(c) 0.719g cm^-3

(d) 0.17g cm^-3

37. Which molecule contains a single covalent bond?

(a) CH₄   ✓

(b) C₂H₂                   

           (c) C₂H₄

(d) O₂

38. The difference between elecronegativities of hydrogen and fluorine

(a) 1.0

(b) 3.0

(c) 2.0

(d) 1.8   ✓

39. The electronegativity of hydrogen atom is

(a) 2.0

(b) 2.2   ✓

(c) 3.0

(d) 2.1

40. The energy required to break the intermolecular forces between one mole of liquid hydrogen chloride molecule to convert into gas is

(a) 22kJ

(b) 132 kJ

(c) 32 kj

(d) 17 kJ   ✓

41. the energy required to break the chemical bond between hydrogen and chlorine atoms in 1 mole of hydrogen chloride is

(a) 320 kJ

(b) 430 kJ   ✓

(c) 365 kJ

(d) 410 kJ

42. The boiling point of water is

(a) 0°C

(b) 35°c

(c) 100°c   ✓

(d) 25°c

43. The boiling point of alcohol is

(a) 44°C

(b) 19°C

(c) 53°C

(d) 78°C   ✓

44. Epoxy adhesives are stable to heat up to a temperature of

(a) 177°C   ✓

(b) 225°C

(c) 320°C

(d) 135°C

45. The density of water at 0°C is

(a) 2.0 g/cm³

(b) 1.0 g/cm³

(c) 0.917 g/cm³   ✓

(d) 1.17 g/cm³

46. The boiling point of NaCl is

(a) 318°C

(b) 1413°C   ✓

(c) 1215°C

(d) 1510°C

47. Which of the following is an example of covalent compound?

(a) C₆H₁₂O₆

(b) CH₄                        

       (c) H₂SO₄

(d) All of these   ✓

48. Every atom has a natural tendency to achieve electrons in its valence shell

(a) 2 or 6

(b) 2 or 8   ✓

(c) 2 or 4

(d) 2 or 10

49. The formation of ionic bond between two ions is due to

(a) Hydrogen bonding

(b) Electrostatic forces   ✓

(c) Metallic forces

(d) All of them

50. How many valence shell electrons are there in Na⁺ ion?

(a) 8

(b) 9   ✓

(c) 10

(d) 11

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