CBSE Questions for Class 11 Medical Chemistry Chemical Bonding And Molecular Structure Quiz 1 - MCQExams.com

The strength of sigma bonds formed by axial overlap of $$s-$$ or $$p-$$ orbitals of $$2nd$$ shell of participating atom decreases as:
  • $$s-s>p-s>p-p$$
  • $$s-s>p-p>s-p$$
  • $$p-s>s-s>p-p$$
  • $$p-p>s-p>s-s$$
Which one of the of the following molecules is expected to have zero dipole moment?
  • $$H_2O$$
  • $$CO_2$$
  • $$SO_2$$
  • $$CaF_2$$
The number of P-O-P and P-O-H bonds present respectively in pyrophosphoric acid molecule are_____
  • 1,2
  • 2,2
  • 1,4
  • 1,8
Which formulae does not correctly represents the bonding capacity of the atom involved?
The number of electron pairs in $$Xe{F}_{4}$$ at the corners of the square are _______.
  • 2
  • 3
  • 4
  • 6
What is the electronic configuration of elements of $$III$$ rd group
  • $$1{ s }^{ 2 },2{ s }^{ 2 }2p{ s }^{ 3 }$$
  • $$1{ s }^{ 2 },2{ s }^{ 2 }2{ p }^{ 6 },3{ s }^{ 2 }3{ p }^{ 1 }$$
  • $$1{ s }^{ 2 },2{ s }^{ 2 }2{ p }^{ 6 }$$
  • $$1{ s }^{ 2 },2{ s }^{ 2 }2{ p }^{ 6 },3{ s }^{ 1 }\quad $$
For which of the following molecule significant $$ \mu \neq 0?$$
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  • Only $$ (c)$$
  • $$ (c)\: and\:(d)$$
  • Only $$ (a)$$
  • $$ (a)\: and\:(b)$$
Identify the pair in which the geometry of the species is T-shape and square pyramidal, respectively.
  • $$ClF_3$$ and $$IO^-_4$$
  • $$ICl^-_2$$ and $$ICl_5$$
  • $$IO^-_3$$ and $$IO_2F^-_2$$
  • $$XeOF_2$$ and $$XeOF_4$$
Boron cannot form which one of the following anions? 
  • $$\mathrm{B}\mathrm{F}_{6}^{3-}$$
  • $$\mathrm{B}\mathrm{H}_{4}^{-}$$
  • $$\mathrm{B}(\mathrm{O}\mathrm{H})_{4}^{-}$$
  • $$\mathrm{B}\mathrm{O}_{2}^{-}$$
The number and type of bonds in $$C_{2}^{2-}$$ ion in $$CaC_2$$ are :
  • one $$\sigma$$ bond and one $$\pi$$-bond
  • one $$\sigma$$ bond and two $$\pi$$-bonds
  • two $$\sigma$$ bonds and two $$\pi$$ -bonds
  • two $$\sigma$$ bonds and one $$\pi$$ - bond
Which of the following molecules has two sigma $$(\sigma)$$ and two pi $$(\pi)$$ bonds?
  • $$C_2H_4$$
  • $$N_2F_2$$
  • $$C_2H_2Cl_2$$
  • $$HCN$$
Total number of lone pair of electrons in $$I_3{^-}$$ ion is :
  • $$9$$
  • $$12$$
  • $$3$$
  • $$6$$
Among the following, the molecule with the highest dipole moment is:
  • $$\mathrm{C}\mathrm{H}_3 {Cl}$$
  • $$\mathrm{C}\mathrm{H}{}_{2}\mathrm{C}l_{2}$$
  • $$\mathrm{C}\mathrm{H}\mathrm{C}l_{3}$$
  • $$\mathrm{C}\mathrm{C}l_{4}$$
Which of the following pairs of ions are isoelectronic and isostructural?
  • $$SO_3^{2-}, NO_3^-$$
  • $$ClO_3^-, CO_3^{2-}$$
  • $$CO_3^{2-}, NO_3 {^-}$$
  • $$ClO_3 {^-}, SO_3^{2-}$$
$$4d,5p,5f$$ and $$6p$$ orbitals are arranged in the order of decreasing energy.The correct option is:
  • $$5f>6p>5p>4d$$
  • $$6p>5f>5p>4d$$
  • $$6p>5f>4d>5p$$
  • $$5f>6p>4d>5p$$
Which one of the following pairs of species have this same bond order?
  • $$N_{2}, {O}_{2}^{-}$$
  • $$CO, NO$$
  • $$O_{2}, NO^{+}$$
  • $$CN^{-}, CO$$
  • Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  • Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  • Assertion is correct but Reason is incorrect
  • Both Assertion and Reason are incorrect
MnO is?
  • Ferromagnetic
  • Antiferromagnetic
  • Ferrimagnetic
  • Dimagnetic
Which of the following phenomena will occur when two atoms of the elements having same spin of electron approach for bonding? 
  • Orbital overlap will not occur
  • Bonding will not occur
  • Both $$A$$ and $$B$$ are correct
  • None of the above
Covalency of carbon in carbon dioxide is:
  • $$2$$
  • $$4$$
  • $$1$$
  • $$0$$
Molecule which contains only sigma bonds in it is:
  • Pentene
  • Pentane
  • Pentadiene
  • Pentyne
Maximum covalency of Sulphur is :
  • $$2$$
  • $$4$$
  • $$6$$
  • $$8$$
In the hydrocarbon, $$HC \equiv C-H$$, the covalency of carbon is :
  • one
  • two
  • three
  • four

Some atoms attain their inert gas configuration by sharing of electrons. This method of attaining inert gas configuration is known as :

  • covalency
  • electrovalency
  • stabilisation
  • inertness
The valency of an atom is equal to its combining capacity.
  • True
  • False
Which of the following species has incomplete octet?
  • $$SiF_4$$
  • $${ N }^{ 3- }$$
  • $$Pbr5$$
  • $${B}^{3-}$$
The number of lone pairs available on the central atom of sulphur tetrafluoride is :
  • $$0$$
  • $$1$$
  • $$2$$
  • $$3$$
In Lewis dot symbols dots indicates the __________.
  • electrons
  • neutrons
  • protons
  • quarks
The electro valency theory explains that atoms are held together by an___________that resulted due to transfer or sharing of electrons.
  • repulsive forces
  • attractive forces
  • binding forces
  • none of these
What is the covalency of $${O}_{2}$$ and $${N}_{2}$$ molecules?
  • 0,0
  • 1,2
  • 2,3
  • 3,3
Which one of these is weakest ?
  • ionic bond
  • covalent bond
  • metallic bond
  • van der Waal forces
A triple bond may be best described as :
  • two sigma bonds and one $$\pi$$ bond
  • one sigma bond and two $$\pi$$ bonds
  • two sigma bonds and two $$\pi$$ bonds
  • three $$\sigma$$ bonds
  • three $$\pi$$ bonds
The number of electron pair shared between two atoms of same or different elements during its formation of molecules is known as :
  • covalency
  • tetravalecy
  • bivalency
  • trivalency
A chemical bond between two atoms is:
  • The tunnel in an atom through which the other one can pass
  • The energy of the individual atoms
  • The link between them
  • A third, connecting atom
What is Bond formation? 
  • always exothermic
  • always endothermic
  • neither exothermic nor endothermic
  • Sometimes exothermic and sometimes endothermic
An _____ bond is a bond in which electrons are transferred.
  • Ionic
  • Covalent
  • Double
  • Triple
The number of sigma and $$\pi$$ bonds in 1-butene-3yne are-
  • $$5$$ sigma and $$5$$ pi
  • $$7$$ sigma and $$3$$ pi
  • $$8$$ sigma and $$2$$ pi
  • $$6$$ sigma and $$4$$ pi
Covalency of nitrogen in ammonium ion is:
  • $$2$$
  • $$3$$
  • $$4$$
  • $$5$$
Molecule which contains only bonded pairs of electrons on the central atom is:
  • $$H_{2}O$$
  • $$NH_{3}$$
  • $$BeCl_{2}$$
  • $$BF_{3}$$
Number of bonded electrons in ethane molecule are:
  • $$7$$
  • $$12$$
  • $$10$$
  • $$14$$
In which of the following molecule, the central atom has three lone pairs of electrons?
  • Ammonia
  • Xenon difluoride
  • Chlorine trifluoride
  • Hydrogen sulphide
Molecule which contains $$4$$ bonded pairs and $$2$$ lone pairs of electrons on the central atom is:
  • $$XeF_{2}$$
  • $$CO_{2}$$
  • $$XeF_{4}$$
  • $$SF_{6}$$
Chemical bond implies ___________.
  • repulsion
  • attraction
  • attraction and repulsion balanced at a particular distance
  • attraction and repulsion
$$Cl+Cl\rightarrow Cl_{2}$$, this is an example for __________.
  • Endothermic reaction
  • Exothermic reaction
  • Either exothermic or endothermic
  • Neither exothermic nor endothermic
Molecule having maximum number of covalent bonds is:
  • $$NH_{4}OH$$
  • $$NH_{4}Cl$$
  • $$CO(NH_{2})_{2}$$
  • $$CH_{3}OH$$
Maximum covalency of nitrogen is:
  • $$4$$
  • $$5$$
  • $$3$$
  • $$6$$
The number of lone pairs on chlorine atom in $$\mathrm{Cl}\mathrm{O}^{-},$$ $$\mathrm{Cl}\mathrm{O}^{-}_{2},\ \mathrm{Cl}\mathrm{O}^{-}_{3},\ \mathrm{C}\mathrm{l}\mathrm{O}^{-}_{4}$$  ions are:
  • $$0, 1, 2, 3$$
  • $$1, 2, 3, 4$$
  • $$4, 3, 2, 1$$
  • $$3, 2, 1, 0$$
According to VSEPR theory, the shape of the water molecule is :
  • linear
  • planar triangle
  • angular
  • octahedral
The covalency of central atom is maximum in:
  • $$HCN$$
  • $$NH_{4}^+$$
  • $$PCl_{5}$$
  • $$H_{2}O$$
Compound having maximum number of bonded pairs of electrons in its molecule is:
  • Ethane
  • Ammonia
  • Sulphur hexafluoride
  • Bromine Pentafluoride
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