CHAPTER # 2
S-Block Elements
1. The oxides of beryllium are.
(A) Acidic (B) Basic
(C) Ba+2 (D) Mg+2
2. Which ion will have the maximum value of heat of hydration?
(A) Na+ (B) Cs+
(C) Ba+2 (D) Mg+2
3. Which one of the following is not an alkali metal?
(A) Sodium sulphate B) Potassium sulphate
(C) Zinc sulphate D) Barium sulphate
4. The element cesium bears resemblance with.
(A) Ca (B) Cr
(C) Both of the above (D) None of the above
5. Chile saltpeter had the chemical formula
(A) NaNO3 (B) KNO3
(C) Na2B4O7 (D) Na2CO3H2O
6. The ore CaSO42H2O has the general name.
(A) Gypsum (B) Dolomite
(C) Calcite (D) Epsom salt
7. Down's cell is used to prepare.
(A) Sodium carbonate
(B) Sodium bicarbonate
(C) Sodium metal
(D) Sodium hydroxide
8. Which element is deposited at the cathode during the electrolysis of brine in Nelson's cell?
(A) H2 (B) Na
(C) CI2 (D) O2
9. Ionic radius of potassium is.
(A) 60 pm (B) 133 pm
(C) 99 pm (D) 169 pm
B
10. Among alkaline Earth Metals, the highest heat of hydration is of.
(A) Be (B) Sr
(C) Rb (D) Cs
11. The chemical formula of sylvite is.
(A) Na2CO3. H2O (B) KCI
(C) KCI. MgCL2. 6H2O (D) NaCI
12. The chemical formula of Alumite (Alum stone) is.
(A) KCI. MgCI2. 6H2O
(B) KCI
(C) Na2B4O7. 10H2O
(D) K2SO4 Al(SO4)3. 2Al(OH)3
13. Among alkali metals the lowest atomic number is of.
(A) Rb (B) K
(C) Sr (D) Li
14. Due to the high reactivity nature of the alkali
metals, they are found in.
(A) Free in nature
(B) Bounded with other elements
(C) Not free in nature
(D) All of the above
15. Magnesium is an essential constituent of.
(A) Storaata (B) Plants
(C) ChlorophyII (C) None of the above
16. Which of the alkali earth metal has radioactive
nature.
(A) Be (B) Rb
(C) Both of the above (D) Na
17. Calcium Phosphate Ca3 (PO4) and calcium
fluoride CaF2 are essential part of living
organisms.
(A) Bones, egg shells (B) teeth
(C) Sea-shells (D) All of the above
18. Dolomite is a compound of which elements.
(A) Be (B) Mg
(C) Ca (D) Ba
19. The melting point and boiling point of which
alkaline earth metal is high.
(A) Sr (B) Mg
(C) Be (D) Na
20. The super oxides are formed by the elements.
(A) K, Rb, Cs (B) K, Na, Cs,
(C) K, Li, Na (D) None of the above
21. Potassium, rubidium and caeslium are so highly reactive that they react with ice even at .
(A) -100OC (B) -200OC
(C) -50oC (D) -0oC
22. Among the alkaline earth metal which has least reactivity even upto 800oC
(A) Ba (B) Cs
(C) Li (D) Be
23. Plaster of paris is formed after heating upto
100OC
(A) Mg(NO3)2 (B) CaSO4, 2H2O(gypsum)
(C) NaNO2 (D) LiNO3
24. The root system of several plants have been
greatly enlarged by the application of.
A) Sulphur B) Gypsum
C) Both of the above D) None of the above
25. When deficiency of calcium exists various
substances are accumulated in plants in harmful concentration which are.
(A) Lime
(B) Aluminium
(C) Aliminium and Manganese
(D) None of the above
26. Which alkali metal behave different by from others?
(A) Mg (B) Na
(C) Rb (D) Li
27. Spodumene, petalite, halite, natron, alinite are
the common minerals of.
A) Alkali metals B) Alkaline earth metals
C) Both of the above D) Li
28. Sodium is prepared by the electrolysis of.
(A) Simple NaCI in Down,s cell
(B) Molten NaCI in Down,s cell
(C) Molten sodium hydroxide in down's cell
(D) None of the above
32. Carbonates of lithium are not stable like that of
sodium due to _____
a) Low electronegativity
b) Low electropositivity
c) Low charge density
d) Not know yet
33. Which one of the following is not an alkali metal?
a) Francium b) Caesium
c) Rubidium d) Radium
34. Which of the following sulphates is not soluble in water?
a) Sodium sulphate b) Potassium sulphate
c) Zinc sulphate d) Barium sulphate
35. The ore CaSO4.2H2O has the general
name____
a) Gypsum b) Dolomite
c) Sodium metal d) Sodium hydroxide
36. Crystals of Na2CO3. 10H2O when exposed to air, _______
a) Lose water and remain solid
b) Gain water and remain solid
c) Gain water and become liquid
d) Remains unchanged.
37. The deliquescence is a process in which a
solid________
a) Absorbs moisture and remains solid
b) Absorbs moisture and turns to liquid form
c) Loses water of crystallization
d) Increases the number of water of
crystallization
38. In diaphragm cell, level of brine in anode
compartment is kept slightly higher which
prevents_________
a) Hydroxide ions to reach anode
b) Chlorine gas to mix
c) Anode to decay
d) All
39. Alkali metals form bonds
a) Ionic b) Covalent
c) Metallic d) Co-ordinate covalent
40. The alkali metals, which have radioactive isotopes
a) Li b) Na
c) K d) K and Rb
41. Halite is the mineral of
a) Sodium b) Potassium
c) Lithium d) Cesium
42. Na2SO3.10H2O is the mineral of sodium and is called
a) Spodumene b) Halite
c) Natron d) Sylvite
43. Which one of the following is dolomite?
a) MgCO3 b) MgCO3.CaCO3
c) CaCO3 d) BaSO4
44. The high electrical conductivity of alkali metals is due to the
Free motion of valence electrons
High I.P
Lesser atomic radii
None of these
45. Sodium imparts color to Bunsen flame
a) Green b) Violet
c) Blue d) Yellow
46. All alkaline earth metals are white except
a) Mg b) Ca
c) Be d) Sr
47. Metals, which are higher that water, are
Alkaline earth metals
Coinage metals
Alkali metals
All of these
48. Except lithium, the hydroxides of all alkali metals are
a) Strongly acidic b) Strongly basic
c) Weakly basic d) All of these
49. The carbonates and phosphates of which elements are insoluble in water
a) Na and K b) Na and Be
c) Li and Mg d) All of these
50. All alkaline earth metals react with water at room temperature to release hydrogen and give basic solutions except
a) Be and Ca b) Be and Mg
c) Ca and Mg d) Mg and Sr
51. Lithium only forms normal oxides when burnt on air but when sodium burnt in air it forms
a) Normal oxides b) Sub oxides
c) Peroxides d) Super oxides
52. The super oxides of alkali metals are generally represented by
a) M2O b) M2O2
c) MO2 d) M2O3
53. The nitrates of which group decompose on heating with the formation of nitrites and evolution of oxygen
a) IA b) II A
c) III A d) IV A
54. A small amount of calcium chloride or mixture of KCl and KF is added to NaCl in Down’s cell
To make it good conductor
To decrease the m.p of NaCl
To increase the ionization of NaCl
To decrease the ionization of NaCl
55. Liquid sodium in the Down’s cell is collected at a temperature of
a) 700oC b) 600oC
c) 500oC d) 400oC
56. The product, which is obtained at cathode in the Down’s cell is
a) Liquid Sodium b) Dry chlorine
c) Water d) Hydrogen
57. Which is manufactured by the electrolysis of fused sodium chloride?
a) NaOH b) NaHCO3
c) Na d) Na2CO3
58. Which of the following does not conduct electricity?
a) Boron b) Gallium
c) Indium d) Thallium
59. Which alkali metal is rare and found in a small amount in all – igneous rocks?
a) Li b) Na
c) K d) Fr
60. The ingredient of baking powder is
a) NaHCO3 b) NaOH
c) Na2CO3 d) NaCl
61. The formula of plaster of Paris is
a) CaSO4 b) CaSO4.H2O
c) CaSO4.2H2O d) 2CaSO4.H2O
62. Which of the following is fluorspar?
a) CaO b) CaCO3
c) CaF2 d) NaOH
63. Potassium is kept in
a) Water b) Alcohol
c) Ammonia d) Kerosene oil
64. Which one has high m.p?
a) NaCl b) NaBr
c) Nal d) NaF
65. Which one of the following is most basic?
a) Al2O3 b) SiO2
c) P2O5 d) MgO
66. Gypsum is
a) CaSO4.2H2O b) CaSO4.H2O
c) CaSO4 d) MgSO4
67. Which one is commonly used as a
laboratory desicator?
a) Na2CO3 b) NaCl
c) CaCl3 d) NaOH
68. The radioactive alkaline earth metal is
a) Be b) Mg
c) Ra d) Ba
69. Which one of the following elements has its compounds which are diamagnetic and colourless?
a) Be b) Sr
c) Na d) All of these
70. Which metal is an important component of transistors?
a) Ag b) Au
c) Ra d) Os
71. Which impurities are present in common salt?
a) Na2SO4 b) CaSO4
c) CaCl2 d) All of these
72. K can displace Na from NaCl due to
Greater I.P of K
Greater I.P of Na
More electropositivity of K
More electropositivity of Na
73. The alkali metal, which is artificially prepared
a) Na b) Rb
c) Fr d) Cs
74. The chemical use for the production of CO2 in the fire extinguishers is
NaOH
NaCl
NaHCO3 and dilute acid
NaHCO3 and NaOH
75. LiCl is more soluble in organic solvents than NaCl because
Li+1 has higher heat of hydration than Na+
Li+1 has lower heat of hydration than Na+
LiCl is more covalent than NaCl
Lattice energy of NaCl is less than that of LiCl
76. Which compound is used for uric acid treatment in human beings?
a) Na2CO3 b) NaHCO3
c) Li2CO3 d) NaNO3
77. Which element is used in T.V picture tube?
a) Na b) K
c) Ca d) Cs
78. Which one is used in the manufacture of chalk pencils?
a) Marble b) Gypsum
c) Epsom salt d) Baking soda
79. Plaster of Paris has a structure
a) Cubic b) Monoclinic
c) Hexagonal d) Orthorhombic
80. Potassium super oxide (KO2) is used in breathing equipments for mountaineers and space craft because it absorb
Oxygen and giving out CO2 at the same time
N2 and giving out CO2 at the same time
CO2 and giving out O2 at the same time
Pollutants and giving out O2 at the same time
81. The hydroxide, which is called milk of magnesium and is used for treatment of acidity in stomach, is
a) Ca(OH)2 b) Mg(OH)2
c) Sr(OH)2 d) Ba(OH)2
82. Mg+2 is smaller the Na+1 because
Mg+2 has fewer electron than Na+1
Mg+2 has greater electron than Na+1
Mg+2 has greater atomic number than Na+1
Mg+2 has low I.P than Na+1
83. Which of them has almost same electronegativity?
a) Be, B b) B, Al
c) Be, Al d) K, Na
84. A mixture formed by mixing one volume of slaked lime Ca(OH)2 with three or four volume of sand and water to form a thick paste is called
a) Lime water b) Dead water
c) Quick lime d) Milk of lime
85. If the compound has the same crystal structure and analogous formulae, they are called
a) Isotopes b) Allotropes
c) Isomers d) Isobars
86. Out of all elements of group IA, the highest
heat of hydration is for _______
a) K b) Rb
c) Cs d) Li
87. The nitride ion in lithium nitride is composed of
a) 7 protons and 7 electrons
b) 10 protons and 7 electrons
c) 10 protons and 10 electrons
d) 10 protons and 5 electrons
88. When NH3 is passed over heated sodium at
300oC, the product formed is
a) NaNH2 b) NaNO2
c) Na(NH3)2 d) Na3N
89. Sodium metal can be stored under
a) Benzene b) Kerosene
c) Alcohol d) Water
90. Chile sulphur is
a) NaNO2 b) KNO2
c) NaNO3 d) KNO3
91. Alkali metals do not exist in
a) Monoatomic b) Diatomic
c) Triatomic d) None of these
92. In general alkali metals act as ________
a) Reducing agents
b) Oxidizing agents
c) Both reducing and oxidizing agents
d) None of these
93. Sodium is not observed in + 2 oxidation state
because of its ______
a) High first ionization potential
b) High second oxidation potential
c) High ionic radius
d) High electronegativity
94. The metallic luster of sodium is explained by the presence of _______
a) Na+ ions
b) Conduction electrons
c) Free protons
d) A body centered cubic lattice
95. In the alkali metal series, Cesium is the most
reactive metal because _______
a) Its incomplete shell is nearest to nucleus
b) The valence electron has a larger orbit than
the orbit of the valence electron of any of
the other.
c) It exerts considerable beautiful force on the
valence electrons
d) It is a heavier metal.
96. A graphite anode is used in Down’s cell for the
production of sodium because ______
a) It does not react with sodium
b) It does not react with chlorine
c) It is easy to fashion in circular form
d) It floats on the fused sodium chloride
97. Alkaline earth metals form ______ carbides on
heating with carbon.
a) Stable b) Unstable
c) Soluble d) None of these
98. When burnt in air, Lithium forms _______
a) Normal oxide b) Peroxide
c) Super oxide d) None of these
99. Sodium bicarbonate is commonly called
a) Soda ash b) Baking soda
c) Caustic soda d) None of these
100. _______ is a stronger base.
a) NaOH b) KOH
c) LiOH d) HCl
101. Excess of NaOH reacts with zinc to form
a) Zn(OH)2 b) ZnH2ZA
c) Na2ZnO2 d) ZnO
102. Which of the following represents calcium
chlorite?
a) CaClO2 b) Ca(ClO4)2
c) Ca(ClO3)2 d) Ca(ClO2)2
103. Sodium hydroxide solution reacts with
phosphorus to give phosphine, To bring about
we need this reaction
a) White phosphorus and dilute NaOH
b) White phosphorus and concentrated NaOH
c) Red phosphorus and dilute NaOH
d) Red phosphorus and concentrated NaOH
104. Sodium reacts with water more vigorously than
lithium because it
a) Has higher atomic weight
b) Is more electronegative
c) Is more electropositive
d) Is a metal
105. Plaster of Paris hardens by
a) Giving off CO2
b) Changing into CaCO3
c) Uniting with water
d) Giving out water
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