JEE Questions for Chemistry Chemical Bonding And Molecular Structure Quiz 6 - MCQExams.com

Which of the following when dissolved in water forms a solution, i.e. non-conducting ?
  • Chile salt petre
  • Potash alum
  • Green vitriol
  • Ethyl alcohol

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If Na+ ion is larger than Mg 2+ ion and S2- is larger than Cl- ion, which of the following will be least soluble in water ?
  • Sodium chloride
  • Sodium sulphide
  • Magnesium chloride
  • Magnesium sulphide

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  • 4
  • 1
  • 2
  • None of these
During the formation of a chemical bond
  • electron-electron repulsion becomes more than thenucleus-electron repulsion attraction
  • energy of the system does not change
  • energy increases
  • energy decreases
A compound contains X ,Y and Z atoms. The oxidation states of X ,Y and Z are +2, + 2 and -2, respectively. The possible formula of the compound is
  • XYZ2
  • Y2 (XZ3 )2
  • X3 (Y4Z)2
  • X3 (YZ4 )3
AB is an ionic solid. The ionic radii of A+ and B- are respectively rc and ra . Lattice energy of AB is proportional to

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    Chemistry-Chemical Bonding and Molecular Structure-1110.png

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C— Cl bond is stronger than C— I bond, because
  • C— Cl bond is more ionic than C— I
  • C— Cl bond is polar covalent bond
  • C— Cl bond is more covalent than C— I
  • C— Cl bond length is longer than C— I
An atom of an element A has three electrons in its outermost orbit and that of B has six electrons in its outermost orbit. The formula of the compound between these two will be
  • A3 B6
  • A2 B3
  • A3 B2
  • A2 B
Allene (C3H4) contains
  • one double bond, one triple bond and one single bond
  • one triple and two double bonds
  • two triple and one double bond
  • two double and four single bond
Order of species CF+ , CF and CF- according to increasing C—F bond length
  • CF+ < CF < CF-
  • CF+ < CF- < CF
  • CF- < CF < CF+
  • CF < CF- < CF+
An atomic orbital has two angular nodes and one radial node. It is a
  • 2p orbital
  • 3p orbital
  • 3d orbital
  • 4d orbital
In case of heteronuclear diatom of the type AB, where A is more electronegative than B, bonding molecular orbital resembles the character of A more than that of B. The statement
  • is false
  • is true
  • cannot be evaluated since data is not sufficient
  • is true only for certain systems
Which of the following stability order is correct

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In which of the following pairs of molecules/ions both the species are not likely to exist?

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Stability of the species Li2 , Li-2 and Li+2 increases in the order of

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Oxygen molecules contains
  • no unpaired electron
  • one unpaired electron
  • two unpaired electrons
  • three unpaired electrons
  • four unpaired electrons
The paramagnetic behaviour of B2 is due to the presence of
  • two unpaired electrons in πb MO
  • two unpaired electrons in π* MO
  • two unpaired electrons in σ* MO
  • two unpaired electrons in σb MO

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  • both paramagnetic character and bond order increase
  • bond order decreases
  • paramagnetic character increases
  • paramagnetic character decreases and the bond order increases
Which of the following is not correct with respect to bond length of the species ?

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Assuming that Hund's rule is violated, the bond order and magnetic nature of the diatomic molecule B2 is
  • 1 and diamagnetic
  • 0 and diamagnetic
  • 1 and paramagnetic
  • 0 and paramagnetic
The bond order in NO is 2.5 while that in NO+ is 3. Which of the following statements is true for these two species ?
  • Bond length in NO+ is greater than in NO
  • Bond length in NO is greater than in NO+
  • Bond length in NO+ is equal to in NO
  • Bond length is unpredictable
In a homonuclear molecule which of the following set of orbitals is degenerate?
  • σ2s and σ1s
  • π*2px and π*2py
  • π2px and σ2pz
  • σ2pz and π*2px
Which species has the highest bond order ?
  • O2
  • 2)
    Chemistry-Chemical Bonding and Molecular Structure-1133.png
  • N2

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Peroxide ion
I. has five completely filled antibonding molecular orbitals
II. is diamagnetic
III. has bond order one
IV. is isoelectronic with neon
Which one of these is correct?
  • II and III
  • I, II and II
  • I, II and III
  • I and IV

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Using Molecular Orbital Theory predict which of the following species has the shortest bond length?

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Which is the correct statement about σ and π molecular orbitals ? Statements are
I. π-bonding orbitals are ungerade
II. π-antibonding orbitals are ungerade
III. σ-antibonding orbitals are gerade
  • Only I
  • Only II and III
  • Only III
  • Only II

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Which one of the following constitutes a group of the isoelectronic species?

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