Chemistry Chapter 11 Entry Test MCQs
51. The electronic configuration of elements A, B and C are [He] 2s1, [Ne] 3s1 and [Ar] 4s1 respectively. Which one of the following order is correct for first ionization potentials (in kJ mol−1) of A, B and C?
a. B > C > A
b. A > B > C
c. C > A > B
d. C > B > A
52. In which of the following arrangements, the order is according to property indicated against it?
(I) I < Br < F < Cl Increasing electron gain enthalpy.
(II) Li < Na < K < Rb Increasing metallic radius.
(III) B < C < N < O Increasing first ionization energy.
(IV) Al3+ < Mg2+ < Na+ < F1- Increasing ionic size.
a. I, II and III
b. I, II and IV
c. I and III only
d. I and II only
53. Among Al2O3, SiO2, P2O3 and SO2, the correct order of acid strength is:
a. SO2 < P2O3 < SiO2 < Al2O3
b. Al2O3 < SiO2 < P2O3 < SO2
c. Al2O3 < SiO2 < SO2 < P2O3
d. SiO2 < SO2 < Al2O 3 < P2O3
54. An element (X) which occurs in the first short period has an outer electronic structure s2p1. What is the formula and acid−base character of its oxides?
a. X2O3, basic.
b. XO3, basic.
c. XO2, acidic
d. X2O3, acidic.
55. The electronic configurations of four elements are given here. Arrange these elements in the correct order of the magnitude (without sign) of their electron affinity.
(I) 2s2 2p5 (II) 2s2 2p4 (III) 3s2 3p5 (IV) 3s2 3p4
Select the correct answer using the codes given under:
a. III < IV < II < I
b. III < IV < I < II
c. II < IV < I < III
d. II < I < IV < III
56. Three elements X, Y and Z are present in the IIIrd short period and their oxides are ionic, amphoteric and giant molecule n, respectively. The correct order of the atomic number of X, Y and Z in the order:
a. X < Z < Y
b. Z < Y < X
c. X < Y < Z
d. Y < Z < X
57. The electronic configuration of the atom having maximum difference in first and second ionization energies is
a. 1s2 , 2s2 , 2p3
b. 1s2 , 2s2 , 2p1
c. 1s2 , 2s2 , 2p6, 2s2
d. 1s2 , 2s2 , 2p6, 3s1
58. The difference between atomic radii is maximum in which one of the following pairs is
a. Na, K
b. Rb, Cs
c. Li, Na
d. K, Rb
59. Which of the following is/are correct order regarding radius?
a. Be2+ < B3+ < Li+
b. Al3+ < Mg2+ < Na+
c. Cl− < S2− < P3−
d. B3+ < Ga3+ < Al3+
60. Which of the following statement is/are correct?
a. Helium has the highest electron affinity
b. Fluorine has the highest electron affinity.
c. Carbon has the highest melting point.
d. Alkali metals are the strongest oxidizing agents
61. The oxidation number for oxygen will always be
a. 1
b. 2
c. -1
d. -2
62. In halogens, which of the following property increases from iodine to fluorine?
a. Bond length
b. Electronegativity
c. Ionization energy of the element
d. Reducing power
63. In which of the following, orders of electron affinity of elements or ions shown here is/are correct?
a. F– > F
b. O− > S–
c. N− > P
d. S > O–
64. Which of the following arrangements show the correct order of increasing lattice energy?
a. MgCO3 < CaCO3 < SrCO3 < BaCO3
b. BaSO4 < SrSO4 < CaSO4 < MgSO4
c. NaF < KF < RbF < CsF
d. LiF < LiCl < LiBr < LiI
S-Block elements
65. Alkali metals are
a. Na, K, Mg, Ca, Rb
b. Li, Na, Be, Mg, Cs
c. K, Rb, Cs, Ba, Sr
d. Li, Na, K, Rb, Cs
66. The reaction of an alkali metal oxide with water is:
a. Precipitation reaction
b. Complexation reaction
c. Acid-base reaction
d. Redox reaction
67. Alkali metals are strong reducing because
a. These are monovalent
b. Their ionisation potential are very high
c. These are metals
d. The standard electrode potential is much negative
68. The solubility of the alkali metal carbonates
a. Does not show regular variation
b. Increases at first and then decreases
c. Decreases as we go down the group
d. Increases as we go down the group
69. Beryllium differs from rest of the members of its family (Group-IIA) in many ways. The reason for this is its
a. Small size and lower electronegativity
b. Small size and higher electronegativity
c. Large size and largest ionic radius
d. Large size and lower ionisation energy
70. The property of the alkaline earth metals that increases with their atomic number is
a. Electronegativity
b. Ionisation energy
c. Solubility of their hydroxides
d. Solubility of their sulphates
71. The formula for calcium chlorite is
a. CaClO2
b. Ca(ClO4)2
c. Ca(ClO2)2
d. Ca(ClO3)2
72. A metal M readily forms its sulphate MSO4 which is water soluble. It forms its oxide MO which becomes inert on heating. It forms its insoluble hydroxide M(OH)2 which is soluble in NaOH solution. The M is
a. Ca
b. Mg
c. Be
d. Ba
73. The ionic compound BaSO4 is insoluble in water due to
a. High lattice energy
b. Low lattice energy
c. Low hydration energy
d. Both (A) and (C)
74. NaOH is prepared by the method
a. Solvay process
b. Down’s cell
c. Nelson cell
d. Castner cell
75. The right order of the solubility of sulphates of alkaline earth metals in water is
a. Be ˃ Mg ˃ Ca ˃ Sr ˃ Ba
b. Be ˃ Ca ˃ Mg ˃ Ba ˃ Sr
c. Mg ˃ Ca ˃ Ba ˃ Be ˃ Sr
d. Mg ˃ Be ˃ Ba ˃ Ca ˃ Sr