CBSE Questions for Class 11 Medical Chemistry Chemical Bonding And Molecular Structure Quiz 4 - MCQExams.com

State True or False.
All the orbitals in a set of hybridised orbitals have the same shape and energy 
  • True
  • False
Which condition don't favours the bond formation:
  • maximum attraction and maximum potential energy.
  • minimum attraction and minimum potential energy.
  • minimum potential energy and maximum attraction.
  • minimum attraction and maximum potential energy.
In the electronic configurations of elements $$A\;and\;B$$ are $$1s^2,\,2s^2\;2p^6,\,3s^1\;and\;1s^2,\,2s^2\;2p^6,\,3s^2\;3p^4$$ respectively, then the formula of the compound formes by the combination of these elements will be
  • $$AB$$
  • $$AB_3$$
  • $$AB_2$$
  • $$A_2B$$
Which reaction involves a change in the electron-pair geometry for the underlined element?
  • $$\underline{B}F_3\, +\, F^-\, \rightarrow\, {\underline{B}F_4}^-$$
  • $$\underline{N}H_3\, +\, H^+\, \rightarrow\, \underline{N}H_4^+$$
  • $$2\underline{S}O_2\, +\, O_2\, \rightarrow\, 2\underline{S}O_3$$
  • $$H_2\underline{O}\, +\, H^+\, \rightarrow\, H_3\underline{O}^+$$
 Bond-breaking is an _________________process.
  • endothermic
  • exothermic
  • neither exothermic nor endothermic
  • either exothermic or endothermic
In a triple bond, there is sharing of:
  • $$3$$ electrons
  • $$4$$ electrons
  • $$6$$ electrons
  • none of these
Consider the following three halides:
(i) $$CH_3-CH_2-Cl$$
(ii) $$CH_2=CH-Cl$$
(iii) $$C_6H_5-Cl$$
Arrange C-Cl bond length of these compounds in decreasing order.
  • i > ii > iii
  • i > iii > ii
  • iii > ii > i
  • ii > iii > i
Which of the following has least polarity in bond?
  • $$H-F$$
  • $$H-Cl$$
  • $$H-O$$
  • $$H-S$$
In covalency,
  • transfer of electrons takes place.
  • one atom acts as donor and other acts as acceptor
  • the electrons are shared by only one atom
  • equal sharing of electrons takes place between two atoms
A sigma bond is formed by the overlapping of:
  • $$s-s$$ orbital alone
  • $$s$$ and $$p$$ orbital alone
  • $$s-s,s-p$$ or $$p-p$$ orbital along internuclear axis
  • $$p-p$$ orbital along the sides
In which of the following species, each atom carries same number of lone pair electrons on it?
  • $$XeO_4^{2-}$$
  • $$XeF_2$$
  • $$XeO_6^{4-}$$
  • $$O_3$$
In which of the following molecules partial charge separation does not take place?
  • Chlorine
  • Hydrochloric acid
  • Water
  • Ammonia
How many lone pair of electrons are present on the central atom of CH$$_4$$, NH$$_3$$, PCl$$_3$$ and PCl$$_5$$ molecules?
  • $$0, 1, 1, 0$$
  • $$0, 1, 1, 1$$
  • $$0, 0, 1, 1$$
  • $$0, 0, 0, 1$$
Which of the following molecules does not have a lone pair of electrons?
  • $$HCl$$
  • $$CO_2$$
  • $$CH_4$$
  • $$NH_3$$
The total number of electrons involved in the formation of CH$$_4$$ molecule are:
  • 6
  • 2
  • 4
  • 8
Which of the following species has four lone pair of electrons?
  • $$OH^-$$
  • $$Cl^-$$
  • $$O^-$$
  • $$I$$
In which of the following molecules, is the covalent bond most polar?
  • HI
  • HBr
  • HCl
  • H$$_2$$
The nature of the chemical bond in MgO is:
  • electrovalent
  • covalent
  • dative
  • polar covalent
The charge in coulombs on $$N^{3-}$$ ion is:
  • $$4.80\times 10^{-19}$$ C
  • $$1.60\times 10^{-19}$$ C
  • $$-3$$ C
  • $$1.8\times 10^{-24}$$ C
Which of the following pairs of compounds will not form H-bonds with each other?
  • Ethanol-methanol
  • Ethanol-water
  • Chloroform-acetone
  • Carbon tetrachloride-acetone
Among the following mixture, maximum dipole-dipole interaction is present in:
  • benzene and ethanol
  • acetonitrile and acetone
  • $$KCl$$ and water
  • benzene and carbon tetra chloride
The structure of the tetrathionate ion is:
What type of bond is formed if atom looses one or more valence electrons  to give positive metal ions?
  • Metallic
  • Hydrogen bonding
  • Polar covalent
  • Ionic
  • Covalent
In $$1-butene$$ number of $$\sigma $$- bonds is:
  • $$8$$
  • $$10$$
  • $$11$$
  • $$12$$
The maximum covalency exhibited by an element isThe number of unpaired electrons in the ground state of an atom is:
  • $$1$$
  • $$2$$
  • $$3$$
  • $$4$$
 Bonding that holds a sample of barium iodide ($$BaI_2$$) together is : 
  • metallic bonding
  • non-polar covalent bonding
  • hydrogen bonding
  • ionic bonding
  • polar covalent bonding
In which of the following pairs, the central atoms have the same number of lone pairs of electrons?
  • $$PCl_{5}, \ BrF_{5}$$
  • $$XeF_{2}, \ {ICl}$$
  • $$XeF_{4},\  {ClO_{4}}^{-}$$
  • $$SCl_{4}, \ CH_{4}$$
Which one of the following is correct regarding $$\sigma$$ molecular orbital ?
  • It is formed by the partial overlap of atomic orbitals at right angle to inter-nuclear axis.
  • The overlapping region is very less.
  • It is a very weak bond
  • The rotation along the inter nuclear axis is symmetric.
The molecules having the same number of lone pair as $$Xe$$ are:
$$(i)  { Xe } {O}_{3}$$  $$(ii) \ { Xe } O{F}_{4}$$  $$(iii)\  { Xe } {F}_{6}$$
  • $$(i)$$ and $$(ii)$$
  • $$(i)$$ and $$(iii)$$
  • $$(ii)$$ and $$(iii)$$
  • $$(i),\ (ii)$$ and $$(iii)$$
Dipole moment of is $$1.5\;D$$. The dipole moment of is
471358.png
  • $$1.5\;D$$
  • $$2.25\;D$$
  • $$1\;D$$
  • $$3\;D$$
The valency of nitrogen in $$NH_{3}$$ is :
  • $$3$$
  • $$4$$
  • $$5$$
  • $$1$$
Which compound is not paired with its correct name?
  • $$FeCl_2$$ / iron(II) chloride
  • $$K_2O$$ / potassium oxide
  • $$NO_2$$ / nitrogen dioxide
  • $$PCl_3$$ / potassium trichloride
  • $$NH_4Cl$$ / ammonium chloride
A sigma bond forms :
  • when two orbitals directly overlap but there is only one bonding interaction.
  • when two orbitals directly overlap and there are two bonding interaction.
  • when two valence electrons combine into one orbital.
  • when two atoms overlap and the valence electrons bond.
  • the creation of an S shaped orbital.
The number of bonds predicted for $$N_{2}$$ :
  • zero
  • one
  • two
  • three
  • four
Which of the following is/has the weakest attractive forces?
  • Vander Waals
  • Coordinate covalent bonding
  • Covalent bonding
  • Polar covalent bonding
  • Ionic bonding
Dipoles are found in:
  • Water
  • Hydrogen bromide
  • Iron
  • Argon
  • Sodium chloride
Non-polar molecule having polar bonds is:
  • phosphorus trichloride (PCl$$_3$$)
  • sulfur dioxide (SO$$_2$$)
  • water (H$$_2$$O)
  • hydrogen chloride (HCl)
  • carbon dioxide (CO$$_2$$)
Which of the following ions or molecules has a nonzero dipole moment?
  • $$\displaystyle { CO }_{ 2 }$$
  • $$\displaystyle { NO }_{ 3 }^{ - }$$
  • $$\displaystyle { PO }_{ 4 }^{ 3- }$$
  • $$\displaystyle { SO }_{ 2 }$$
  • $$\displaystyle { SO }_{ 4 }^{ 2- }$$
Which one among the following is not paramagnetic?
  • $$Be^-$$
  • $$Ne^{2+}$$
  • $$Cl^-$$
  • $$As^+$$
Among the following identify the molecules with $$sp^2 - p$$ $$\sigma$$ bonds.
  • $$BeCl_2$$
  • $$C_2H_2$$
  • $$BCl_3$$
  • $$BF_3$$
Number of lone pairs and bond pairs in ammonia molecule is ___________.
  • 1 and 3
  • 1 and 2
  • 0 and 3
  • 2 and 3
Statement $$1$$: The molecule $$SO_{2}$$ has a net dipole.
Statement $$2$$: Oxygen has the higher electronegativity than sulfur.
  • Both Statement $$1$$ and Statement $$2$$ are correct and Statement $$2$$ is the correct explanation of Statement $$1$$.
  • Both Statement $$1$$ and Statement $$2$$ are correct, but Statement $$2$$ is NOT the correct explanation of Statement 1.
  • Statement $$1$$ is correct, but Statement $$2$$ is not correct.
  • Statement $$1$$ is not correct, but Statement $$2$$ is correct.
The correct order of strength of bonds is:
  • $$s-s>s-p>p-p$$
  • $$s - s < s - p < p - p$$
  • $$s-p>s-s>p-p$$
  • $$s-s>p-p>s-p$$

The bonds present in $$N_2O_5$$ are :
  • only ionic
  • covalent and coordinate
  • only covalent
  • covalent and ionic
Using formal charge, which of the following would be the least likely structure for dinitrogen monoxide based on the knowledge that oxygen is NOT the central atom?
  • All three structures are equally likely as drawn.
The polarity of a molecular compound results from an imbalance of the sharing electrons in the bond based on electronegativity differences and atomic structure.
Which of the following gases would be the least polar?
  • Nitrogen monoxide
  • Ammonia
  • Ethane $$(CH_{3}CH_{3})$$.
  • Hydrogen cyanide.
Use the figure below to answer the question that follows.
For which of the molecules in the figure does the central atom, or atoms, have $$sp^{2}$$ hybridization?
526423_d3df6a2ca54f422f87065916d53cb63f.png
  • III only
  • IV only
  • III and IV only
  • II and IV only
Main axis of diatomic molecule is $$Z$$. The orbitals $$p_x$$ and $$p_y$$ overlap to form :
  • $$\pi$$-molecular orbital
  • $$\sigma$$-molecular orbital
  • $$\delta$$-molecular orbital
  • no bond is formed
Which of the following structures has a dipole moment in terms of atom and unbonded electron pair placement from a Lewis Dot structure view?
  • $$IF_{4}^{1-}$$
  • $$XeF_{4}$$
  • $$IF_{4}^{1+}$$
  • $$NH_{4}^{1+}$$

Correct order of $$CO$$ bond length is:
  • $$CO^+ >{ C }_{ 2 }{ O }_{ 4 }^{ 2- } >CO$$
  • $$CO^+ > CO > { C }_{ 2 }{ O }_{ 4 }^{ 2- } $$
  • $$ { C }_{ 2 }{ O }_{ 4 }^{ 2- }> CO^+ > CO $$
  • $$ { C }_{ 2 }{ O }_{ 4 }^{ 2- }> CO> CO^+ $$
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