s-Block Elements Practice

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NEET Chemistry - Chapter 17

s-Block Elements Practice Tests

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Configuration
1. General outer electronic configuration of s-block elements is:
- A. ns$^1$ or ns$^2$ (Correct)
- B. np$^1$ to np$^6$
- C. (n-1)d$^1$ to d$^{10}$
- D. (n-2)f$^1$ to f$^{14}$
Explanation: The differentiating electron enters the s-subshell.
Group
2. Alkali metals belong to:
- A. group 1 (Correct)
- B. group 2
- C. group 17
- D. group 18
Explanation: They have one valence electron.
Group
3. Alkaline earth metals belong to:
- A. group 2 (Correct)
- B. group 1
- C. group 16
- D. group 13
Explanation: They have two valence electrons.
Reactivity
4. Alkali metals are highly reactive because they have:
- A. low ionization enthalpy (Correct)
- B. high electronegativity
- C. small atomic size only
- D. stable half-filled p orbitals
Explanation: They lose the valence electron easily.
Trend
5. Reactivity of alkali metals down the group generally:
- A. increases (Correct)
- B. decreases
- C. remains constant
- D. first increases then decreases
Explanation: Ionization enthalpy falls down the group.
Flame test
6. Sodium imparts which color to flame?
- A. golden yellow (Correct)
- B. brick red
- C. lilac
- D. apple green
Explanation: Na gives the characteristic golden-yellow flame.
Flame test
7. Potassium imparts which color to flame?
- A. lilac (Correct)
- B. golden yellow
- C. brick red
- D. blue green
Explanation: Potassium shows a pale violet or lilac flame.
Hydroxides
8. Alkali-metal hydroxides are generally:
- A. strong bases and highly soluble (Correct)
- B. weak acids
- C. insoluble salts
- D. amphoteric oxides
Explanation: They ionize almost completely in water.
Carbonates
9. Thermal stability of alkali-metal carbonates down the group generally:
- A. increases (Correct)
- B. decreases
- C. remains unchanged
- D. becomes zero
Explanation: Larger cations polarize carbonate less strongly.
Exception
10. Lithium shows anomalous behavior mainly due to its:
- A. small size and high polarizing power (Correct)
- B. high metallic radius
- C. d-orbitals
- D. low hydration enthalpy
Explanation: Lithium differs sharply from the rest of group 1.
Diagonal relation
11. Lithium shows diagonal relationship with:
- A. magnesium (Correct)
- B. calcium
- C. beryllium
- D. aluminium
Explanation: This is a standard periodicity connection.
Alkaline earth
12. Beryllium differs from the rest of its group mainly because of:
- A. small size and high charge density (Correct)
- B. presence of d orbitals
- C. high atomic mass
- D. radioactivity
Explanation: This gives Be unusual covalent character.
Hydroxides
13. Basic strength of group 2 hydroxides down the group:
- A. increases (Correct)
- B. decreases
- C. remains fixed
- D. becomes acidic
Explanation: Metallic character rises down the group.
Solubility
14. Solubility of group 2 hydroxides down the group generally:
- A. increases (Correct)
- B. decreases
- C. remains the same
- D. becomes zero
Explanation: Lattice and hydration enthalpy changes favor increasing solubility.
Solubility
15. Solubility of group 2 sulfates down the group generally:
- A. decreases (Correct)
- B. increases
- C. stays constant
- D. becomes alkaline
Explanation: Hydration enthalpy falls sharply down the group.
Compounds
16. Na$_2$CO$_3\cdot10$H$_2$O is commonly called:
- A. washing soda (Correct)
- B. baking soda
- C. caustic soda
- D. quick lime
Explanation: This hydrated carbonate is washing soda.
Compounds
17. NaHCO$_3$ is commonly called:
- A. baking soda (Correct)
- B. bleaching powder
- C. washing soda
- D. slaked lime
Explanation: Sodium hydrogen carbonate is baking soda.
Compounds
18. CaOCl$_2$ is commonly called:
- A. bleaching powder (Correct)
- B. quick lime
- C. gypsum
- D. plaster of Paris
Explanation: It is used for bleaching and disinfection.
Compounds
19. CaSO$_4\cdot\frac{1}{2}$H$_2$O is:
- A. plaster of Paris (Correct)
- B. gypsum
- C. slaked lime
- D. quick lime
Explanation: POP is the hemihydrate of calcium sulfate.
Quick lime
20. Quick lime is:
- A. CaO (Correct)
- B. Ca(OH)$_2$
- C. CaCO$_3$
- D. CaSO$_4$
Explanation: Calcium oxide is called quick lime.
Slaked lime
21. Slaked lime is:
- A. Ca(OH)$_2$ (Correct)
- B. CaO
- C. CaCO$_3$
- D. CaCl$_2$
Explanation: Hydration of CaO gives slaked lime.
Anomalous behavior
22. Unlike other alkali metal carbonates, Li$_2$CO$_3$:
- A. decomposes on heating (Correct)
- B. is highly stable to heat
- C. is strongly basic in solution only
- D. contains peroxide ion
Explanation: Lithium resembles magnesium in this respect.
Nitrates
23. On heating, most alkali metal nitrates except lithium form:
- A. nitrites and oxygen (Correct)
- B. oxides directly
- C. ammonia
- D. hydrides
Explanation: Lithium nitrate behaves differently and gives the oxide.
Biological role
24. Magnesium is present in chlorophyll as the central atom in:
- A. plants (Correct)
- B. human hemoglobin
- C. rock salt
- D. bleaching powder
Explanation: Mg is central in chlorophyll.
s-Block logic
25. A dependable NEET pattern in s-block is to compare trends, then memorize the landmark compounds and:
- A. anomalous lithium and beryllium behavior (Correct)
- B. molecular orbital diagrams
- C. p-block oxidation states
- D. electrolysis products
Explanation: Those exceptions account for many direct questions.
Configuration
26. General outer electronic configuration of s-block elements is:
- A. ns$^1$ or ns$^2$ (Correct)
- B. np$^1$ to np$^6$
- C. (n-1)d$^1$ to d$^{10}$
- D. (n-2)f$^1$ to f$^{14}$
Explanation: The differentiating electron enters the s-subshell.
Group
27. Alkali metals belong to:
- A. group 1 (Correct)
- B. group 2
- C. group 17
- D. group 18
Explanation: They have one valence electron.
Group
28. Alkaline earth metals belong to:
- A. group 2 (Correct)
- B. group 1
- C. group 16
- D. group 13
Explanation: They have two valence electrons.
Reactivity
29. Alkali metals are highly reactive because they have:
- A. low ionization enthalpy (Correct)
- B. high electronegativity
- C. small atomic size only
- D. stable half-filled p orbitals
Explanation: They lose the valence electron easily.
Trend
30. Reactivity of alkali metals down the group generally:
- A. increases (Correct)
- B. decreases
- C. remains constant
- D. first increases then decreases
Explanation: Ionization enthalpy falls down the group.
Flame test
31. Sodium imparts which color to flame?
- A. golden yellow (Correct)
- B. brick red
- C. lilac
- D. apple green
Explanation: Na gives the characteristic golden-yellow flame.
Flame test
32. Potassium imparts which color to flame?
- A. lilac (Correct)
- B. golden yellow
- C. brick red
- D. blue green
Explanation: Potassium shows a pale violet or lilac flame.
Hydroxides
33. Alkali-metal hydroxides are generally:
- A. strong bases and highly soluble (Correct)
- B. weak acids
- C. insoluble salts
- D. amphoteric oxides
Explanation: They ionize almost completely in water.
Carbonates
34. Thermal stability of alkali-metal carbonates down the group generally:
- A. increases (Correct)
- B. decreases
- C. remains unchanged
- D. becomes zero
Explanation: Larger cations polarize carbonate less strongly.
Exception
35. Lithium shows anomalous behavior mainly due to its:
- A. small size and high polarizing power (Correct)
- B. high metallic radius
- C. d-orbitals
- D. low hydration enthalpy
Explanation: Lithium differs sharply from the rest of group 1.
Diagonal relation
36. Lithium shows diagonal relationship with:
- A. magnesium (Correct)
- B. calcium
- C. beryllium
- D. aluminium
Explanation: This is a standard periodicity connection.
Alkaline earth
37. Beryllium differs from the rest of its group mainly because of:
- A. small size and high charge density (Correct)
- B. presence of d orbitals
- C. high atomic mass
- D. radioactivity
Explanation: This gives Be unusual covalent character.
Hydroxides
38. Basic strength of group 2 hydroxides down the group:
- A. increases (Correct)
- B. decreases
- C. remains fixed
- D. becomes acidic
Explanation: Metallic character rises down the group.
Solubility
39. Solubility of group 2 hydroxides down the group generally:
- A. increases (Correct)
- B. decreases
- C. remains the same
- D. becomes zero
Explanation: Lattice and hydration enthalpy changes favor increasing solubility.
Solubility
40. Solubility of group 2 sulfates down the group generally:
- A. decreases (Correct)
- B. increases
- C. stays constant
- D. becomes alkaline
Explanation: Hydration enthalpy falls sharply down the group.
Compounds
41. Na$_2$CO$_3\cdot10$H$_2$O is commonly called:
- A. washing soda (Correct)
- B. baking soda
- C. caustic soda
- D. quick lime
Explanation: This hydrated carbonate is washing soda.
Compounds
42. NaHCO$_3$ is commonly called:
- A. baking soda (Correct)
- B. bleaching powder
- C. washing soda
- D. slaked lime
Explanation: Sodium hydrogen carbonate is baking soda.
Compounds
43. CaOCl$_2$ is commonly called:
- A. bleaching powder (Correct)
- B. quick lime
- C. gypsum
- D. plaster of Paris
Explanation: It is used for bleaching and disinfection.
Compounds
44. CaSO$_4\cdot\frac{1}{2}$H$_2$O is:
- A. plaster of Paris (Correct)
- B. gypsum
- C. slaked lime
- D. quick lime
Explanation: POP is the hemihydrate of calcium sulfate.
Quick lime
45. Quick lime is:
- A. CaO (Correct)
- B. Ca(OH)$_2$
- C. CaCO$_3$
- D. CaSO$_4$
Explanation: Calcium oxide is called quick lime.
Slaked lime
46. Slaked lime is:
- A. Ca(OH)$_2$ (Correct)
- B. CaO
- C. CaCO$_3$
- D. CaCl$_2$
Explanation: Hydration of CaO gives slaked lime.
Anomalous behavior
47. Unlike other alkali metal carbonates, Li$_2$CO$_3$:
- A. decomposes on heating (Correct)
- B. is highly stable to heat
- C. is strongly basic in solution only
- D. contains peroxide ion
Explanation: Lithium resembles magnesium in this respect.
Nitrates
48. On heating, most alkali metal nitrates except lithium form:
- A. nitrites and oxygen (Correct)
- B. oxides directly
- C. ammonia
- D. hydrides
Explanation: Lithium nitrate behaves differently and gives the oxide.
Biological role
49. Magnesium is present in chlorophyll as the central atom in:
- A. plants (Correct)
- B. human hemoglobin
- C. rock salt
- D. bleaching powder
Explanation: Mg is central in chlorophyll.
s-Block logic
50. A dependable NEET pattern in s-block is to compare trends, then memorize the landmark compounds and:
- A. anomalous lithium and beryllium behavior (Correct)
- B. molecular orbital diagrams
- C. p-block oxidation states
- D. electrolysis products
Explanation: Those exceptions account for many direct questions.
Configuration
51. General outer electronic configuration of s-block elements is:
- A. ns$^1$ or ns$^2$ (Correct)
- B. np$^1$ to np$^6$
- C. (n-1)d$^1$ to d$^{10}$
- D. (n-2)f$^1$ to f$^{14}$
Explanation: The differentiating electron enters the s-subshell.
Group
52. Alkali metals belong to:
- A. group 1 (Correct)
- B. group 2
- C. group 17
- D. group 18
Explanation: They have one valence electron.
Group
53. Alkaline earth metals belong to:
- A. group 2 (Correct)
- B. group 1
- C. group 16
- D. group 13
Explanation: They have two valence electrons.
Reactivity
54. Alkali metals are highly reactive because they have:
- A. low ionization enthalpy (Correct)
- B. high electronegativity
- C. small atomic size only
- D. stable half-filled p orbitals
Explanation: They lose the valence electron easily.
Trend
55. Reactivity of alkali metals down the group generally:
- A. increases (Correct)
- B. decreases
- C. remains constant
- D. first increases then decreases
Explanation: Ionization enthalpy falls down the group.
Flame test
56. Sodium imparts which color to flame?
- A. golden yellow (Correct)
- B. brick red
- C. lilac
- D. apple green
Explanation: Na gives the characteristic golden-yellow flame.
Flame test
57. Potassium imparts which color to flame?
- A. lilac (Correct)
- B. golden yellow
- C. brick red
- D. blue green
Explanation: Potassium shows a pale violet or lilac flame.
Hydroxides
58. Alkali-metal hydroxides are generally:
- A. strong bases and highly soluble (Correct)
- B. weak acids
- C. insoluble salts
- D. amphoteric oxides
Explanation: They ionize almost completely in water.
Carbonates
59. Thermal stability of alkali-metal carbonates down the group generally:
- A. increases (Correct)
- B. decreases
- C. remains unchanged
- D. becomes zero
Explanation: Larger cations polarize carbonate less strongly.
Exception
60. Lithium shows anomalous behavior mainly due to its:
- A. small size and high polarizing power (Correct)
- B. high metallic radius
- C. d-orbitals
- D. low hydration enthalpy
Explanation: Lithium differs sharply from the rest of group 1.
Diagonal relation
61. Lithium shows diagonal relationship with:
- A. magnesium (Correct)
- B. calcium
- C. beryllium
- D. aluminium
Explanation: This is a standard periodicity connection.
Alkaline earth
62. Beryllium differs from the rest of its group mainly because of:
- A. small size and high charge density (Correct)
- B. presence of d orbitals
- C. high atomic mass
- D. radioactivity
Explanation: This gives Be unusual covalent character.
Hydroxides
63. Basic strength of group 2 hydroxides down the group:
- A. increases (Correct)
- B. decreases
- C. remains fixed
- D. becomes acidic
Explanation: Metallic character rises down the group.
Solubility
64. Solubility of group 2 hydroxides down the group generally:
- A. increases (Correct)
- B. decreases
- C. remains the same
- D. becomes zero
Explanation: Lattice and hydration enthalpy changes favor increasing solubility.
Solubility
65. Solubility of group 2 sulfates down the group generally:
- A. decreases (Correct)
- B. increases
- C. stays constant
- D. becomes alkaline
Explanation: Hydration enthalpy falls sharply down the group.
Compounds
66. Na$_2$CO$_3\cdot10$H$_2$O is commonly called:
- A. washing soda (Correct)
- B. baking soda
- C. caustic soda
- D. quick lime
Explanation: This hydrated carbonate is washing soda.
Compounds
67. NaHCO$_3$ is commonly called:
- A. baking soda (Correct)
- B. bleaching powder
- C. washing soda
- D. slaked lime
Explanation: Sodium hydrogen carbonate is baking soda.
Compounds
68. CaOCl$_2$ is commonly called:
- A. bleaching powder (Correct)
- B. quick lime
- C. gypsum
- D. plaster of Paris
Explanation: It is used for bleaching and disinfection.
Compounds
69. CaSO$_4\cdot\frac{1}{2}$H$_2$O is:
- A. plaster of Paris (Correct)
- B. gypsum
- C. slaked lime
- D. quick lime
Explanation: POP is the hemihydrate of calcium sulfate.
Quick lime
70. Quick lime is:
- A. CaO (Correct)
- B. Ca(OH)$_2$
- C. CaCO$_3$
- D. CaSO$_4$
Explanation: Calcium oxide is called quick lime.
Slaked lime
71. Slaked lime is:
- A. Ca(OH)$_2$ (Correct)
- B. CaO
- C. CaCO$_3$
- D. CaCl$_2$
Explanation: Hydration of CaO gives slaked lime.
Anomalous behavior
72. Unlike other alkali metal carbonates, Li$_2$CO$_3$:
- A. decomposes on heating (Correct)
- B. is highly stable to heat
- C. is strongly basic in solution only
- D. contains peroxide ion
Explanation: Lithium resembles magnesium in this respect.
Nitrates
73. On heating, most alkali metal nitrates except lithium form:
- A. nitrites and oxygen (Correct)
- B. oxides directly
- C. ammonia
- D. hydrides
Explanation: Lithium nitrate behaves differently and gives the oxide.
Biological role
74. Magnesium is present in chlorophyll as the central atom in:
- A. plants (Correct)
- B. human hemoglobin
- C. rock salt
- D. bleaching powder
Explanation: Mg is central in chlorophyll.
s-Block logic
75. A dependable NEET pattern in s-block is to compare trends, then memorize the landmark compounds and:
- A. anomalous lithium and beryllium behavior (Correct)
- B. molecular orbital diagrams
- C. p-block oxidation states
- D. electrolysis products
Explanation: Those exceptions account for many direct questions.
Configuration
76. General outer electronic configuration of s-block elements is:
- A. ns$^1$ or ns$^2$ (Correct)
- B. np$^1$ to np$^6$
- C. (n-1)d$^1$ to d$^{10}$
- D. (n-2)f$^1$ to f$^{14}$
Explanation: The differentiating electron enters the s-subshell.
Group
77. Alkali metals belong to:
- A. group 1 (Correct)
- B. group 2
- C. group 17
- D. group 18
Explanation: They have one valence electron.
Group
78. Alkaline earth metals belong to:
- A. group 2 (Correct)
- B. group 1
- C. group 16
- D. group 13
Explanation: They have two valence electrons.
Reactivity
79. Alkali metals are highly reactive because they have:
- A. low ionization enthalpy (Correct)
- B. high electronegativity
- C. small atomic size only
- D. stable half-filled p orbitals
Explanation: They lose the valence electron easily.
Trend
80. Reactivity of alkali metals down the group generally:
- A. increases (Correct)
- B. decreases
- C. remains constant
- D. first increases then decreases
Explanation: Ionization enthalpy falls down the group.
Flame test
81. Sodium imparts which color to flame?
- A. golden yellow (Correct)
- B. brick red
- C. lilac
- D. apple green
Explanation: Na gives the characteristic golden-yellow flame.
Flame test
82. Potassium imparts which color to flame?
- A. lilac (Correct)
- B. golden yellow
- C. brick red
- D. blue green
Explanation: Potassium shows a pale violet or lilac flame.
Hydroxides
83. Alkali-metal hydroxides are generally:
- A. strong bases and highly soluble (Correct)
- B. weak acids
- C. insoluble salts
- D. amphoteric oxides
Explanation: They ionize almost completely in water.
Carbonates
84. Thermal stability of alkali-metal carbonates down the group generally:
- A. increases (Correct)
- B. decreases
- C. remains unchanged
- D. becomes zero
Explanation: Larger cations polarize carbonate less strongly.
Exception
85. Lithium shows anomalous behavior mainly due to its:
- A. small size and high polarizing power (Correct)
- B. high metallic radius
- C. d-orbitals
- D. low hydration enthalpy
Explanation: Lithium differs sharply from the rest of group 1.
Diagonal relation
86. Lithium shows diagonal relationship with:
- A. magnesium (Correct)
- B. calcium
- C. beryllium
- D. aluminium
Explanation: This is a standard periodicity connection.
Alkaline earth
87. Beryllium differs from the rest of its group mainly because of:
- A. small size and high charge density (Correct)
- B. presence of d orbitals
- C. high atomic mass
- D. radioactivity
Explanation: This gives Be unusual covalent character.
Hydroxides
88. Basic strength of group 2 hydroxides down the group:
- A. increases (Correct)
- B. decreases
- C. remains fixed
- D. becomes acidic
Explanation: Metallic character rises down the group.
Solubility
89. Solubility of group 2 hydroxides down the group generally:
- A. increases (Correct)
- B. decreases
- C. remains the same
- D. becomes zero
Explanation: Lattice and hydration enthalpy changes favor increasing solubility.
Solubility
90. Solubility of group 2 sulfates down the group generally:
- A. decreases (Correct)
- B. increases
- C. stays constant
- D. becomes alkaline
Explanation: Hydration enthalpy falls sharply down the group.
Compounds
91. Na$_2$CO$_3\cdot10$H$_2$O is commonly called:
- A. washing soda (Correct)
- B. baking soda
- C. caustic soda
- D. quick lime
Explanation: This hydrated carbonate is washing soda.
Compounds
92. NaHCO$_3$ is commonly called:
- A. baking soda (Correct)
- B. bleaching powder
- C. washing soda
- D. slaked lime
Explanation: Sodium hydrogen carbonate is baking soda.
Compounds
93. CaOCl$_2$ is commonly called:
- A. bleaching powder (Correct)
- B. quick lime
- C. gypsum
- D. plaster of Paris
Explanation: It is used for bleaching and disinfection.
Compounds
94. CaSO$_4\cdot\frac{1}{2}$H$_2$O is:
- A. plaster of Paris (Correct)
- B. gypsum
- C. slaked lime
- D. quick lime
Explanation: POP is the hemihydrate of calcium sulfate.
Quick lime
95. Quick lime is:
- A. CaO (Correct)
- B. Ca(OH)$_2$
- C. CaCO$_3$
- D. CaSO$_4$
Explanation: Calcium oxide is called quick lime.
Slaked lime
96. Slaked lime is:
- A. Ca(OH)$_2$ (Correct)
- B. CaO
- C. CaCO$_3$
- D. CaCl$_2$
Explanation: Hydration of CaO gives slaked lime.
Anomalous behavior
97. Unlike other alkali metal carbonates, Li$_2$CO$_3$:
- A. decomposes on heating (Correct)
- B. is highly stable to heat
- C. is strongly basic in solution only
- D. contains peroxide ion
Explanation: Lithium resembles magnesium in this respect.
Nitrates
98. On heating, most alkali metal nitrates except lithium form:
- A. nitrites and oxygen (Correct)
- B. oxides directly
- C. ammonia
- D. hydrides
Explanation: Lithium nitrate behaves differently and gives the oxide.
Biological role
99. Magnesium is present in chlorophyll as the central atom in:
- A. plants (Correct)
- B. human hemoglobin
- C. rock salt
- D. bleaching powder
Explanation: Mg is central in chlorophyll.
s-Block logic
100. A dependable NEET pattern in s-block is to compare trends, then memorize the landmark compounds and:
- A. anomalous lithium and beryllium behavior (Correct)
- B. molecular orbital diagrams
- C. p-block oxidation states
- D. electrolysis products
Explanation: Those exceptions account for many direct questions.
Configuration
101. General outer electronic configuration of s-block elements is:
- A. ns$^1$ or ns$^2$ (Correct)
- B. np$^1$ to np$^6$
- C. (n-1)d$^1$ to d$^{10}$
- D. (n-2)f$^1$ to f$^{14}$
Explanation: The differentiating electron enters the s-subshell.
Group
102. Alkali metals belong to:
- A. group 1 (Correct)
- B. group 2
- C. group 17
- D. group 18
Explanation: They have one valence electron.
Group
103. Alkaline earth metals belong to:
- A. group 2 (Correct)
- B. group 1
- C. group 16
- D. group 13
Explanation: They have two valence electrons.
Reactivity
104. Alkali metals are highly reactive because they have:
- A. low ionization enthalpy (Correct)
- B. high electronegativity
- C. small atomic size only
- D. stable half-filled p orbitals
Explanation: They lose the valence electron easily.
Trend
105. Reactivity of alkali metals down the group generally:
- A. increases (Correct)
- B. decreases
- C. remains constant
- D. first increases then decreases
Explanation: Ionization enthalpy falls down the group.
Flame test
106. Sodium imparts which color to flame?
- A. golden yellow (Correct)
- B. brick red
- C. lilac
- D. apple green
Explanation: Na gives the characteristic golden-yellow flame.
Flame test
107. Potassium imparts which color to flame?
- A. lilac (Correct)
- B. golden yellow
- C. brick red
- D. blue green
Explanation: Potassium shows a pale violet or lilac flame.
Hydroxides
108. Alkali-metal hydroxides are generally:
- A. strong bases and highly soluble (Correct)
- B. weak acids
- C. insoluble salts
- D. amphoteric oxides
Explanation: They ionize almost completely in water.
Carbonates
109. Thermal stability of alkali-metal carbonates down the group generally:
- A. increases (Correct)
- B. decreases
- C. remains unchanged
- D. becomes zero
Explanation: Larger cations polarize carbonate less strongly.
Exception
110. Lithium shows anomalous behavior mainly due to its:
- A. small size and high polarizing power (Correct)
- B. high metallic radius
- C. d-orbitals
- D. low hydration enthalpy
Explanation: Lithium differs sharply from the rest of group 1.
Diagonal relation
111. Lithium shows diagonal relationship with:
- A. magnesium (Correct)
- B. calcium
- C. beryllium
- D. aluminium
Explanation: This is a standard periodicity connection.
Alkaline earth
112. Beryllium differs from the rest of its group mainly because of:
- A. small size and high charge density (Correct)
- B. presence of d orbitals
- C. high atomic mass
- D. radioactivity
Explanation: This gives Be unusual covalent character.
Hydroxides
113. Basic strength of group 2 hydroxides down the group:
- A. increases (Correct)
- B. decreases
- C. remains fixed
- D. becomes acidic
Explanation: Metallic character rises down the group.
Solubility
114. Solubility of group 2 hydroxides down the group generally:
- A. increases (Correct)
- B. decreases
- C. remains the same
- D. becomes zero
Explanation: Lattice and hydration enthalpy changes favor increasing solubility.
Solubility
115. Solubility of group 2 sulfates down the group generally:
- A. decreases (Correct)
- B. increases
- C. stays constant
- D. becomes alkaline
Explanation: Hydration enthalpy falls sharply down the group.
Compounds
116. Na$_2$CO$_3\cdot10$H$_2$O is commonly called:
- A. washing soda (Correct)
- B. baking soda
- C. caustic soda
- D. quick lime
Explanation: This hydrated carbonate is washing soda.
Compounds
117. NaHCO$_3$ is commonly called:
- A. baking soda (Correct)
- B. bleaching powder
- C. washing soda
- D. slaked lime
Explanation: Sodium hydrogen carbonate is baking soda.
Compounds
118. CaOCl$_2$ is commonly called:
- A. bleaching powder (Correct)
- B. quick lime
- C. gypsum
- D. plaster of Paris
Explanation: It is used for bleaching and disinfection.
Compounds
119. CaSO$_4\cdot\frac{1}{2}$H$_2$O is:
- A. plaster of Paris (Correct)
- B. gypsum
- C. slaked lime
- D. quick lime
Explanation: POP is the hemihydrate of calcium sulfate.
Quick lime
120. Quick lime is:
- A. CaO (Correct)
- B. Ca(OH)$_2$
- C. CaCO$_3$
- D. CaSO$_4$
Explanation: Calcium oxide is called quick lime.
Slaked lime
121. Slaked lime is:
- A. Ca(OH)$_2$ (Correct)
- B. CaO
- C. CaCO$_3$
- D. CaCl$_2$
Explanation: Hydration of CaO gives slaked lime.
Anomalous behavior
122. Unlike other alkali metal carbonates, Li$_2$CO$_3$:
- A. decomposes on heating (Correct)
- B. is highly stable to heat
- C. is strongly basic in solution only
- D. contains peroxide ion
Explanation: Lithium resembles magnesium in this respect.
Nitrates
123. On heating, most alkali metal nitrates except lithium form:
- A. nitrites and oxygen (Correct)
- B. oxides directly
- C. ammonia
- D. hydrides
Explanation: Lithium nitrate behaves differently and gives the oxide.
Biological role
124. Magnesium is present in chlorophyll as the central atom in:
- A. plants (Correct)
- B. human hemoglobin
- C. rock salt
- D. bleaching powder
Explanation: Mg is central in chlorophyll.
s-Block logic
125. A dependable NEET pattern in s-block is to compare trends, then memorize the landmark compounds and:
- A. anomalous lithium and beryllium behavior (Correct)
- B. molecular orbital diagrams
- C. p-block oxidation states
- D. electrolysis products
Explanation: Those exceptions account for many direct questions.

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