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CBSE
Class 11 Chemistry
Chemical Bonding And Molecular Structure Chapter 4
Quiz 1
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During the formation of a chemical bond between two atoms:
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Only forces of repulsion are operative
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Forces of attraction and repulsion forces, both are operative
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Forces are not involved
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Only forces of attraction are operative
Who discovered the octet rule?
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Langmuir
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Debye
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Boyle
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Kossel and Lewis
The Lewis structure of H2S is: H:S:H H.S.H H:S.H
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A
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B
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C
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D
A CO2 molecule contains:
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Two sigma and two pi bonds
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Four sigma bonds
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Three sigma and one pi bond
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Four pi bonds
Which one of them is an odd-electron molecule?
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BCl3
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SF6
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NO
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CO2
According to the Lewis symbols, the nucleus as well as the electrons in the inner shell of an element is represented by:
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The symbol of the element
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The number of dots on the symbol
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Atomic mass
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Atomic number
For the formation of covalent bond the difference in the value of electro negativities should be:
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Less than 2.7
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Equal to 2.7
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More than 1.7
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Equal to or less than 1.7
Select the molecule in which the central atom has incomplete octet.
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NF3
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BeH2
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H2O
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CO2
Among the following compounds octet rule is not obeyed by:
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PCl3
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SF6
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SO3
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SO2
The correct Lewis dot structure for BeF2 molecule is: F.Be.F F: Be: F F.Be: F
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A
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B
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C
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D
The number of dots in the Lewis symbol represents:
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The number of valence electrons present in the atom
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Atomic mass of the element
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Atomic number of the element
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The electronic configuration of the atom
According to Lewis symbol, the valency of N is:
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4
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3
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2
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6
The formal charge on oxygen which is single bonded in ozone is:
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-1
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+1
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+2
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-2
The formation of a chemical bond is accompanied by:
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Sometimes increase and sometimes decrease in energy
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Decrease in energy
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Increase in energy
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Neither increase nor decrease in energy
Identify an example of covalent solid:
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Sodium chloride
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Silicon carbide
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Calcium chloride
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Methane
Covalent compounds are soluble in:
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Polar solvents
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Non-polar solvents
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Concentrated acids
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All solvents
A force which binds atoms of same or different elements by mutual sharing of electrons is called:
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Covalent bond
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Co-ordinate bond
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Hydrogen bond
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Ionic bond
Which one of the following statement is not true for octet rule?
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It does not explain relative stability of molecules.
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It is useful for understanding structures of most of organic compounds.
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It is based upon the chemical inertness of noble gases.
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It accounts for the shape of molecules.
Among the following molecules octet rule is not obeyed by:
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OF2
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CO2
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PCl3
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ClF3
The number of electrons present in the valence shell of the central atom of super octet molecules is:
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Six
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More than eight
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Eight
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Two
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