MCQOPTIONS
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MCQOPTIONS
This section includes 402 Mcqs, each offering curated multiple-choice questions to sharpen your UPSEE knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Double bonds, as compared to single bonds are |
| A. | shorter |
| B. | longer |
| C. | stronger |
| D. | weaker |
| Answer» B. longer | |
| 52. |
When the bond is formed by the sharing of two pairs of electrons by atoms, the bond if |
| A. | single covalent bond |
| B. | double covalent bond |
| C. | triple covalent bond |
| D. | ionic bond |
| Answer» C. triple covalent bond | |
| 53. |
From left to right in a period, atomic radii |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | none of these |
| Answer» C. remains same | |
| 54. |
Electrons clouds are always moving hence creating temporary forces called |
| A. | Van der Waal's forces only |
| B. | dipole-induced-dipole interaction only |
| C. | dipole-dipole repulsion |
| D. | Van der Waal's forces and dipole-induced-dipole interaction |
| Answer» E. | |
| 55. |
Electron affinity of halogens is |
| A. | low |
| B. | high |
| C. | neutral |
| D. | no effect |
| Answer» C. neutral | |
| 56. |
In methane, the tetrahedral structure is due to |
| A. | bonds being pushed further apart |
| B. | bonds being pulled closer together |
| C. | distorting the molecular structure |
| D. | equal repulsive forces of each bonded electron pair |
| Answer» E. | |
| 57. |
Half of single bond length between two similar atoms covalently bond in a molecule', is referred to |
| A. | ionic radii |
| B. | covalent radii |
| C. | atomic radii |
| D. | nuclear radii |
| Answer» C. atomic radii | |
| 58. |
The electronegativity of Magnesium is |
| A. | 1.31 |
| B. | 3.04 |
| C. | 2.2 |
| D. | 1.61 |
| Answer» B. 3.04 | |
| 59. |
Electrons involved in bonding are from |
| A. | duplet |
| B. | octet |
| C. | outermost shells |
| D. | innermost shell |
| Answer» D. innermost shell | |
| 60. |
A unit difference which shows roughly equal contributions of ionic and covalent bond is |
| A. | 1.5 |
| B. | 1.6 |
| C. | 1.4 |
| D. | 1.7 |
| Answer» E. | |
| 61. |
Lone pair of electrons in ammonia is |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» B. 2 | |
| 62. |
The bond length in C-O is |
| A. | 0.154 |
| B. | 0.143 |
| C. | 0.134 |
| D. | 0.116 |
| Answer» C. 0.134 | |
| 63. |
Character of bonds which are formed between different elements are |
| A. | polar and non-polar |
| B. | neutral |
| C. | non-polar |
| D. | polar |
| Answer» E. | |
| 64. |
Due to the triple bond between nitrogen molecule, it is |
| A. | polar |
| B. | unreactive |
| C. | compressed |
| D. | reactive |
| Answer» C. compressed | |
| 65. |
Reactions are started by attacking on electrically charged end of polar molecule by |
| A. | reactants |
| B. | reagent |
| C. | catalyst |
| D. | products |
| Answer» C. catalyst | |
| 66. |
Fluorine is most |
| A. | electronegative element |
| B. | positive element |
| C. | high tendency element |
| D. | both a and b |
| Answer» B. positive element | |
| 67. |
In period from left to right ionization energy is |
| A. | increase |
| B. | decrease |
| C. | remain same |
| D. | diminishes |
| Answer» B. decrease | |
| 68. |
The bond that is a trigonal pyramid in shape is |
| A. | CH₄ |
| B. | NH₃ |
| C. | ClF₃ |
| D. | AlCl₃ |
| Answer» D. AlCl₃ | |
| 69. |
In period from left to right electron affinity of elements |
| A. | increases |
| B. | decreases |
| C. | fluctuates |
| D. | releases |
| Answer» B. decreases | |
| 70. |
A non-polar molecule of Bromine at room temperature is found in the state of |
| A. | solid |
| B. | liquid |
| C. | gas |
| D. | vapor |
| Answer» C. gas | |
| 71. |
Amount of energy released during formation of KCl crystal lattice is |
| A. | 691kJmol |
| B. | 692kJmol |
| C. | 690kJmol |
| D. | 693kJmol |
| Answer» D. 693kJmol | |
| 72. |
Hydrogen bonding reduces the quality of water molecules to |
| A. | repel |
| B. | attract |
| C. | compactly arrange |
| D. | slide over each other |
| Answer» E. | |
| 73. |
Formation of compounds PF₅, SF₆, BCl₃ are not according to rule of |
| A. | octet |
| B. | doublet |
| C. | triplet |
| D. | none of these |
| Answer» B. doublet | |
| 74. |
Electron affinity of alkali metals is |
| A. | constant |
| B. | high |
| C. | low |
| D. | none of these |
| Answer» D. none of these | |
| 75. |
Permanent dipole-dipole forces are present between two |
| A. | atoms |
| B. | molecules |
| C. | orbits |
| D. | electrons |
| Answer» C. orbits | |
| 76. |
Electronegativity refers to the |
| A. | sea of electrons in elements |
| B. | attraction of an atom for the electrons in a bond |
| C. | attraction of neutrons |
| D. | contact points in molecular structures |
| Answer» C. attraction of neutrons | |
| 77. |
Oxygen contains double bond but still needs to break its 1 mol with help so energy equal to |
| A. | 496kJ |
| B. | 946kJ |
| C. | 649kJ |
| D. | 469kJ |
| Answer» B. 946kJ | |
| 78. |
The electronegativity of Oxygen is |
| A. | 2.55 |
| B. | 2.2 |
| C. | 3.44 |
| D. | 3.04 |
| Answer» D. 3.04 | |
| 79. |
Average distance between nucleus of atom and its outermost electronic shell is called |
| A. | atomic radius |
| B. | atomic size |
| C. | atomic junction |
| D. | atomic weight |
| Answer» B. atomic size | |
| 80. |
Electron affinity of oxygen atom is |
| A. | −143 |
| B. | −142 |
| C. | −141 |
| D. | −144 |
| Answer» D. −144 | |
| 81. |
If atoms attain stability by sharing electron, it is referred to as |
| A. | ionic bonds |
| B. | covalent bonds |
| C. | metallic bonds |
| D. | dative bond |
| Answer» C. metallic bonds | |
| 82. |
Covalent radius of chlorine is |
| A. | 99.4pm |
| B. | 99.2pm |
| C. | 99.3pm |
| D. | 99.5pm |
| Answer» B. 99.2pm | |
| 83. |
Electronic configuration 2,8,6 indicates that in order to gain stability, oxygen is short of |
| A. | one electron |
| B. | one pair of electron |
| C. | three electrons |
| D. | two pairs of electron |
| Answer» C. three electrons | |
| 84. |
Formula of Lithium chloride is |
| A. | LiCl₂ |
| B. | Li2Cl |
| C. | LiCl |
| D. | Li₃Cl₂ |
| Answer» D. Li₃Cl₂ | |
| 85. |
Phase in which, atoms and ions are isolated and are free from all external influences is |
| A. | gaseous |
| B. | liquid |
| C. | solid |
| D. | both a and b |
| Answer» B. liquid | |
| 86. |
Electro negativity of carbon atom is |
| A. | 2.6 |
| B. | 2.5 |
| C. | 2.4 |
| D. | 2.3 |
| Answer» C. 2.4 | |
| 87. |
Lone pair of electrons (e⁻) in water are |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 88. |
Ionic compounds conduct electricity |
| A. | when dissolved in water |
| B. | when in molten form |
| C. | when in gaseous form |
| D. | both a and b |
| Answer» E. | |
| 89. |
The atom is held together by strong force present between electrons and nuclei of |
| A. | attraction |
| B. | repulsion |
| C. | energy |
| D. | heat |
| Answer» B. repulsion | |
| 90. |
Ionic radius of lithium in pm is |
| A. | 60 |
| B. | 61 |
| C. | 67 |
| D. | 65 |
| Answer» B. 61 | |
| 91. |
Ionic bond is formed by complete transfer of electron form atom with low ionization energy to another atom and with high electron affinity ,it is theory of |
| A. | Nylholm |
| B. | Lewis |
| C. | bohar |
| D. | Gillespic |
| Answer» C. bohar | |
| 92. |
The greater the difference between electronegativities the more is the |
| A. | polarity |
| B. | molarities |
| C. | repulsion rate |
| D. | attraction rate |
| Answer» B. molarities | |
| 93. |
Stable noble gas which lies near to F is |
| A. | Xenon |
| B. | Neon |
| C. | helium |
| D. | Argon |
| Answer» C. helium | |
| 94. |
K and Cl ions arrange themselves to form a |
| A. | diamond |
| B. | crystal lattice |
| C. | graphite |
| D. | thick cloud |
| Answer» C. graphite | |
| 95. |
For dative covalent bonding, one atom having a lone pair of electrons combines with a/an |
| A. | electron deficient compound |
| B. | expanded octet |
| C. | proton of the other atom |
| D. | neutron of the other atom |
| Answer» B. expanded octet | |
| 96. |
A molecule of aluminum chloride (AlCl₃) is formed by the bond called |
| A. | ionic bond |
| B. | covalent bond |
| C. | co-ordinate bond |
| D. | dative bond |
| Answer» D. dative bond | |
| 97. |
Distance of 75.4 pm, where attractive forces dominate repulsive forces, that distance is called |
| A. | bond distance |
| B. | bond length |
| C. | compromise distance |
| D. | all of these |
| Answer» E. | |
| 98. |
Non-metals in group VII are likely to form |
| A. | ionic bonds |
| B. | covalent bonds |
| C. | metallic bonds |
| D. | dative bond |
| Answer» B. covalent bonds | |
| 99. |
Solvents of covalent compounds include all but |
| A. | alcohol |
| B. | water |
| C. | petrol |
| D. | tetra chloromethane |
| Answer» C. petrol | |
| 100. |
Noble gases are liquefied at |
| A. | high temperatures |
| B. | low temperatures |
| C. | high pressures |
| D. | low pressures |
| Answer» C. high pressures | |