Group 16 elements

Group 16 Elements Flashcard-Style Content (Direct & Complete)

1. Q: What is the group number of Group 16 elements?

Group 16 (VIA)

2. Q: What is the general outer electronic configuration of Group 16 elements?

ns2 np4

3. Q: What is the family name of Group 16 elements?

Chalcogen family

4. Q: Name the elements in Group 16.

O, S, Se, Te, Po, Lv

5. Q: Why are Group 16 elements called chalcogens?

Because they are ore-forming elements

6. Q: Which Group 16 element is radioactive?

Polonium & Liverorium

7. Q: Order of melting point in Group 16 elements?

O < Po < S < Se < Te

8. Q: Order of boiling point in Group 16 elements?

O < S < Se < Te < Po

9. Q: Which element in Group 16 is gaseous at room temperature?

Oxygen

10. Q: Which Group 16 elements are solids?

Sulphur, Selenium, Tellurium, Polonium

11. Q: Which Group 16 element is a metalloid?

Tellurium

12. Q: Which Group 16 element is metal?

Polonium

13. Q: Atomic and ionic size trend in Group 16?

Increases down the group

14. Q: Ionisation enthalpy trend in Group 16?

Decreases down the group

15. Q: Electronegativity trend in Group 16?

Decreases down the group

16. Q: Metallic character trend in Group 16?

Increases down the group

17. Q: Which element in Group 16 has highest ionisation enthalpy?

Oxygen

18. Q: Which Group 16 element is most electronegative?

Oxygen

19. Q: Which element in Group 16 shows anomalous behaviour?

Oxygen

20. Q: Two reasons for anomalous behaviour of oxygen?

Small size, high electronegativity

21. Q: Maximum covalency of oxygen?

2

22. Q: Why does oxygen not show +4 and +6 oxidation states?

No d-orbitals

23. Q: Common oxidation state of oxygen?

-2

24. Q: Oxidation states shown by other Group 16 elements?

-2, +2, +4, +6

25. Q: Common oxidation states shown by sulphur?

-2, +2, +4, +6

26. Q: General formula of hydrides of Group 16?

H2E

27. Q: Order of boiling point of hydrides?

H2O > H2Te > H2Se > H2S > H2Po

28. Q: Order of bond angle in hydrides?

H2O > H2S > H2Se > H2Te

29. Q: Which hydride is most stable?

H2O

30. Q: Trend of thermal stability in hydrides?

Decreases down the group

31. Q: Trend of acidic strength in hydrides?

Increases down the group

32. Q: Most acidic hydride of Group 16?

H2Po

33. Q: Physical state of H2O at room temperature?

Liquid

34. Q: Physical state of H2S at room temperature?

Gas

35. Q: Shape of H2O molecule?

Bent/angular

36. Q: Hybridisation of O in H2O?

sp3

37. Q: Type of bonding in O2?

p pi - p pi bonding

38. Q: Paramagnetic nature of O2 explained by?

Molecular orbital theory

39. Q: Bond order of O2 molecule?

2

40. Q: Laboratory preparation of dioxygen?

By heating KClO3 in presence of MnO2

41. Q: Formula for lab preparation of O2?

2KClO3 --MnO2--> 2KCl + 3O2

42. Q: Commercial method of O2 preparation?

Fractional distillation of liquid air

43. Q: Preparation of O3?

By passing silent electric discharge through dry O2

44. Q: Shape of O3 molecule?

Bent

45. Q: Bond order in ozone molecule?

1.5

46. Q: Hybridisation of O in ozone?

sp2

47. Q: Test for ozone?

Turns starch-iodide paper blue

48. Q: Use of ozone layer?

Protects from UV radiation

49. Q: Which compound causes ozone layer depletion?

CFCs (Chlorofluorocarbons)

50. Q: Common allotropes of sulphur?

Rhombic and monoclinic

51. Q: More stable allotrope of sulphur at room temp?

Rhombic sulphur

52. Q: Conversion temp of rhombic to monoclinic sulphur?

369K

53. Q: Structure of S8 molecule?

Crown shape

54. Q: Which element in Group 16 shows maximum catenation?

Sulphur

55. Q: Trend of catenation down Group 16?

Decreases down the group

56. Q: Oxides of sulphur?

SO2 and SO3

57. Q: Oxidation state of S in SO2?

+4

58. Q: Oxidation state of S in SO3?

+6

59. Q: Which sulphur oxide is reducing?

SO2

60. Q: Which sulphur oxide is oxidising?

SO3

61. Q: Important industrial process using SO2 and SO3?

Contact process

62. Q: Catalyst used in contact process?

V2O5 (Vanadium pentoxide)

63. Q: SO3 + H2O gives?

H2SO4

64. Q: Sulphuric acid nature?

Dibasic, strong acid, dehydrating agent

65. Q: Common oxyacids of sulphur?

H2SO3, H2SO4, H2S2O7

66. Q: Colour of sulphur dioxide gas?

Colourless with pungent smell

67. Q: SO2 turns which solution milky?

Lime water

68. Q: Structure of SO2 molecule?

Angular/bent

69. Q: Bond angle in SO2?

~119 degrees

70. Q: What is oleum?

H2S2O7 (pyrosulphuric acid)