Chemistry 12 - S-Block Elements

1. The S-block elements are metals in Groups: a) I-A & II-A b) VI & VII c) II-A & I-A d) A-I & A-II

2. Elements of group I- A are called: a) Carbides b) Alkali metals c) Alkaline earth metals d) Lithium nitride

3. Elements of Group II-A are called: a) Carbides b) Lithium nitride c) Alkaline earth metals d) Alkali metals

4. Due to high reactivity, the alkali metals occur in: a) Magnesium b) Alumino silicates c) Reducing d) Combined state

5. The general electronic configuration of alkaline earth metals is: a) ns1 b) ns2 c) ns2, np1 d) ns2,np2

6. Which of the following element is not from S - block: a) Magnesium b) Sodium c) Lithium d) Aluminum

7. The hepta hydrate MgSO4. 7H2O is known as: a) Epsom b) Epsom salt c) Carbide d) Caustic soda

8. Anomalous behavior of Lithium is due to its: a) Small radius & high charge density b) Least atomic mass c) Higher density d) Normal structure

9. Sodium carbonate is commonly known as: a) Baking soda b) Caustic soda c) Lime soda d) Washing soda

10. Lithium reacts with nitrogen to form: a) Lithium nitride b) Reducing c) Small d) Carbides

11. Alkali metals except Lithium do not form: a) Reducing b) Super c) Carbides d) Magnesium

12. All alkali metals are powerful: a) Reducing agents b) Higher electro negative c) Least reactive d) Super agents

13. Melting and boiling point of Beryllium are: a) Higher than other alkaline earth metals b) Equal to Magnesium boiling and melting points c) Normal d) Lower then other members of group II - A

14. Be + 2NaOH ® Na2 BeO2 + _______ a) H1 b) H2 c) H3 d) H5

15. Potassium, Rubidium and Cesium react with oxygen to form: a) Super oxides b) Mg3N2 c) Higher d) Hydroxyl ions

16. Due to the presence of hydride ion, ionic hydrides of alkali metals are used as: a) Powerful reducing agents b) High electro-negative elements c) Basic oxides d) None of these

17. The least reactive metal in group II - A. a) Magnesium b) Calcium c) Beryllium d) Barium

18. Na+ ion is: a) Larger than Na b) Equal to Na c) None of these d) Smaller than Na

19. Electrolysis of molten NaCl gives: a) Na & H2 b) Na & O2 c) Na & Cl2 d) H2 & O2

20. Which of the following element has lowest 32; electro negativity: a) Li b) Na c) K d) Cs

21. The reaction of KO2 and CO2 is as : a) (CaSO4)2 . H2O b) 4KO2(s) +2CO2(g) ® 2K2CO3 + 3O2(g) c) NH3 d) Mg3N2

22. Epsom can be prepared by the action of dilute H2SO4 on: a) CaCO3 b) MgSO4 c) NaHCO3 d) MgCO3

23. Alkali metals are highly: a) Reactive & electro-positive elements b) Reactive & electro-negative c) Non-reactive elements d) None of these

24. Alkaline earth metals lose their valence electrons to form: a) M+2 b) M+1 c) M-1 d) M-2

25. The diagonal neighbor of Be is: a) Aluminum b) Boron c) Sodium d) Calcium

26. Nelson's cell is used for the preparation of: a) Cl2 b) NaOH c) NaHCO3 d) Na2CO3

27. Alkali metals form: a) Ionic bond b) Covalent bond c) Non- polar bond d) None of these

28. Chemical formula of Plaster of Paris is: a) (CaSO4)2 . H2O b) CaSO4 c) CaCO3 d) 2CaSO4 . 2H2O

29. Ca (O C l) C l or CaOCl2 is commonly known as: a) Epsom b) Washing Soda c) Plaster of Paris d) Bleaching Powder

30. MgCO3.CaCO3 is commonly known as: a) Magnetite b) Dolomite c) Epsom d) Bleaching powder

31. Down's Process is used for the extraction of: a) Calcium carbonate b) Sodium metal c) Ammonia gas d) Plaster of Paris

32. S - block elements reacts with water more rapidly and oxidation reaction occurs, due to this reason: a) S - block elements can not be used in Voltaic cells b) S -block elements can be used in Voltaic cells c) None of these d) Voltaic cells of S - block elements are the best than other elements

33. The group trend of melting and boiling points of S - block elements: a) Increases down the group b) Decreases down the group c) Remain as same d) None of these

34. The comparison between the Ionization potential of I - A group & II - A group shows that: a) The first I.P of group I - A is less than first I.P of group II - A b) Both are same c) The first I.P of group I - A is higher than first I.P of group II - A d) None of these

35. The densities of S - block elements: a) Decreases down the group b) Increases down the group c) Remain un-changed d) None of these

36. Saturated solution of common salt is called as: a) Lye b) Brine c) Caustic soda d) Lime water

37. In Castner - Kellner's process cathode is made up of: a) Graphite b) Moving mercury c) Carbon d) Iron

38. The chemical formula of canalite is: a) MgCl2 b) MgCO3 c) KCl d) MgCl2 . KC l . 6H2O

39. In limited supply of oxygen, sodium reacts with it & forms: a) Super oxide b) Per oxide c) Double oxide d) Normal oxide

40. When elements of group I - A combine with halogens they form: a) M X b) M2 X c) M X2 d) M2 X2

41. Permanent hardness of water is causes by: a) CaSO4 b) CaCO3 c) Na2SO4 d) MgSO4

42. Anhydrous sodium carbonate is: a) Soda ash b) Baking soda c) Caustic soda d) Epsom salt

43. Baking soda is also called as: a) Caustic Soda b) Washing Soda c) Soda ash d) Sodium bicarbonate

44. Epsom salt is a hydrate of : a) Calcium sulphate b) Magnesium sulphate c) Iron sulphate d) Copper sulphate

45. The electrolytic process which is used in manufacturing NaOH is: a) Down's process b) Contact Process c) Castner - Kellner's process d) Haber's process

46. The only alkaline earth metal which reacts with alkalis releasing H2 is a) Calcium b) Beryllium c) Barium d) Strontium

47. Which member of group II - A is radioactive in nature: a) Magnesium b) Calcium c) Beryllium d) Radium

48. In Nelsons Cell method chlorine gas is obtained at : a) Cathode b) Anode c) At the bottom of Nelson's cell d) Not produced at all

49. When gypsum is heated above 100 32; °C, it loses a) Its some water of crystallization b) Its all water of crystallization c) Sulphate ions d) Bond between Calcium & sulphate

50. When bleaching powder is used with water it liberates, a) Oxygen b) Hydrogen c) Chlorine d) None of these

51. Alkali metal which explodes spontaneously when comes in contact with air or oxygen is: a) Sodium b) Cesium c) Lithium d) Potassium

52. Sodium hydrogen carbonate is used as: a) Water softener b) Bleaching Powder c) None of these d) Baking powder & anti-acid

53. The hydroxides of group II - A are: a) Readily soluble in water b) Insoluble in water c) Radioactive in nature d) Sparingly soluble

54. Magnesium Sulphate is: a) Epson Salt b) A rare radioactive metal c) Unstable d) None of these

55. Generally Radium is known as: a) A rare radioactive metal b) Salt of magnesium sulphate c) Salt of calcium sulphate d) Stable element

56. The treatment of acidity in stomach is: a) NaCl b) NaOH c) Mg (OH) 32; 2 d) Epson Salt

57. Which of the following is lighter: a) Li b) Na c) K d) Ca

58. Na may acts as : a) Oxidizing agent b) Reducing agent c) Both a & b d) None of these

59. The heat of hydration of S - block elements: a) Not affected b) Increases down the group c) Decreases down the group d) None of these

60. All alkaline earth metals are white in colour except: a) Mg b) Ca c) Be which silvery gray in appearance d) None

61. In S - block elements generally the ionic size is: a) Increases b) Not affected c) Decreased d) None of these

62. Which one is the least reactive: a) Be b) Na c) Mg d) Al

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