CBSE Questions for Class 11 Medical Chemistry Chemical Bonding And Molecular Structure Quiz 2 - MCQExams.com

The molecule having maximum number of sigma bonds in it is:
  • Ethane
  • Ethene
  • Ethyne
  • Sulphur hexafluoride
The number of electron bond pairs involved in the formation of hydrogen cyanide molecule are:
  • two
  • eight
  • three
  • four
Valence bond theory of Pauling and Slater accounts for the following characteristic of covalent bond:
  • directional
  • ionic
  • strength
  • hybrid
Covalency for central atom is maximum in :
  • $$BF_{3}$$
  • $$SO_{2}Cl_{2}$$
  • $$POCl_{3}$$
  • $$BeCl_{2}$$
The number of electron pairs present in the valency shell of central atom in $$SF_{6}$$ molecule are:
  • $$4$$
  • $$6$$
  • $$8$$
  • $$7$$
Hybridisation involves:
  • addition of an electron pair
  • combination and redistribution of atomic orbitals
  • removal of an electron pair
  • separation of orbitals
Molecule having maximum number of lone pairs of electrons on central atom is:
  • $$PH_{3}$$
  • $$H_{2}S$$
  • $$CH_{4}$$
  • $$BrF_{5}$$
The molecular weight of an oxide of Hydrogen is $$34$$. Therefore the number of covalent bonds in its molecule are:
  • $$4$$
  • $$5$$
  • $$2$$
  • $$3$$
In $$OF_{2}$$, number of bond pairs and lone pairs of electrons are respectively:
  • $$2, 6$$
  • $$2, 8$$
  • $$2, 10$$
  • $$2, 9$$
Diethyl ether is mostly used in solvent extraction due to all of the following reasons except:
  • Its solvation capacity is very high
  • being inert, it does not react with most organic compound
  • there are two lone pairs in it, therefore it acts as a strong nucleophile
  • its boiling point is low, therefore, it can be easily separated by distillation
Among the following ions, the $$p\pi - d\pi$$ overlap could be present in:
  • $$NO^{-}_{3}$$
  • $$PO^{3-}_{4}$$
  • $$CO^{2-}_{3}$$
  • $$NO^{-}_{2}$$
Which formulae does not correctly represents the bonding capacity of the atom involved?
According to VSEPR theory, the most probable shape of the molecule having $$4$$ electron pairs in the outer shell of the central atom is:
  • linear
  • tetrahedral
  • pyramidal
  • octahedral
The number of sigma bonds in $$1$$-butene is:
  • $$8$$
  • $$10$$
  • $$11$$
  • $$12$$
A molecule having 3 bond pairs and 2 lone pairs will have:
  • T-shaped structure
  • Trigonal planar structure
  • Linear structure
  • Square pyramidal structure
Which of the following unit conversion of dipole moment is correct?
  • $$1 D = 3.3356 Cm$$
  • $$1D= 3.3356\times10^{-30}C m$$
  • $$1 Cm = 3.3356 D$$
  • $$1 C m = 3.3356\times10^{-30} D$$
Length of the hydrogen bond range from $$1.75A^{o}$$ to _________.
  • $$2.5A^{o}$$
  • $$2.75A^{o}$$
  • $$2.6A^{o}$$
  • $$3.2A^{o}$$
The percentage of s- character of the hybrid orbitals in ethane, ethene and ethyne are respectively:
  • $$50, 75, 100$$
  • $$10, 20, 40$$
  • $$25, 33, 50$$
  • $$25, 50, 75$$
Which of the following does not contain any co-ordinate bond?
  • $$H_3O^+$$
  • $$BF_4^-$$
  • $$HF_2^-$$
  • $$NH_4^+$$
Compounds having equal number of hybrid orbitals among the following are:
  • none of these
Which of the following is diamagnetic?
  • $${ H }_{ 2 }^+ $$
  • $$O_2$$
  • $$H_2$$
  • $${ H }_{ 2} ^- $$
In which of the compound given below contains more than one kind of hybridization ($$sp,sp^{2}$$, $$sp^{3}$$ ) for carbon:
  • $$CH_{3}CH_{2}CH_{2}CH_{3}$$
  • $$CH_{3}-CH=CH-CH_{3}$$
  • $$CH_{2}=CH-CH=CH_{2}$$
  • $$H-C\equiv C-H$$
The molecule in which xenon is surrounded by three lone pairs and two bond pairs is:
  • $$ \mathrm{X}\mathrm{e}\mathrm{F}_{2}$$
  • $$\mathrm{X}\mathrm{e}\mathrm{F}_{4}$$
  • $$\mathrm{X}\mathrm{e}\mathrm{F}_{6}$$
  • $$\mathrm{X}\mathrm{e}\mathrm{O}_{4}$$

Which one of the following molecular geometries (i.e. shapes) is not possible for the $$sp^{3}d^{2}$$ hybridization?
  • Capped octahedral
  • Octahedral
  • Square planar
  • Square pyramidal
Which of the following statements is not correct?
  • $$(s + p_y)$$ produces sp hybrid orbitals which are lying in the yz plane
  • $$(s + p_y)$$ produces sp hybrid orbitals which are lying the xz plane
  • $$(s + p_x + p_z)$$ produces sp2 hybrid orbitals which are lying in the xz plane
  • $$(s p_y)$$ produces sp hybrid orbitals which are lying along the y-axis

Which of the following are isostructural ?

(I)$$NO_{3}^{-}$$

(II)$$CO_{3}^{2-}$$

(III)$$CIO_{3}^{-}$$

(IV)$$SO_{3}$$

(V)$$ XeO_{3}$$
  • (I) and (IV)
  • (II) and (V)
  • (III) and (IV)
  • (IV) and (V)
The shape of $$XY_3$$ molecule if there is no lone pair on the central atom is trigonal planar.
  • True
  • False
The maximum covalency of oxygen in ozone is:
  • 5
  • 3
  • 2
  • 4
Which of these molecules have non-bonding electron pairs on the central atom?
I : $$SF_4$$       II : $$ICl_3$$         III: $$SO_2$$
  • II only
  • I and II only
  • I and III only
  • I, II and III
The  compound with the highest degree of covalency is :
  • NaCl
  • MgO
  • AgCl
  • CsCl
Select the INCORRECT statement :
  • $$N_2O$$ with sodium metal in liquid ammonia forms sodium azide and nitrogen gas is liberated.
  • Ammonia is oxidized to nitrogen by dilute solution of sodium hypochlorite in presence of glue.
  • Ammonium dichromate on heating decomposes to give nitrogen and a green coloured compound.
  • CaNCN on hydrolysis produces a white precipitate and a gas which turns filter paper moistened with copper sulphate solution deep blue.
Write the order of repulsions among the electron pairs.
Lone pair - lone pair > lone pair - bond pair > bond pair - bond pair
  • True
  • False
The number of non-bonded electrons present on the central atom in the molecule of ammonia is two.
  • True
  • False
How many unpaired electrons are present in $$N_2^+$$ :
  • 1
  • 2
  • 3
  • 4
In the electronic structure of H$$_2$$SO$$_4$$, the total number of shared electrons is:
  • $$20$$
  • $$16$$
  • $$12$$
  • $$8$$
Which metal(s) can be used to produce electrons b the photoelectric effect from given source of light?
  • Barium only
  • Barium or lithium
  • Lithium, tantalum or tungsten
  • Tungsten or tantalum
The bond between two identical non metallic atoms has a pair of electron:
  • unequally shared among the two atoms.
  • equally shared among two atoms.
  • equal transfer of electrons from one atom to another.
  • shared by only one atom.
Which of the following compound has a directional bond?
  • Magnesium chloride
  • Solid neon
  • Hydrogen sulphide
  • Caesium fluoride
Linear overlapping of any two pure atomic p - orbitals lead to sigma bond formation.
  • True
  • False
The Hydrogen bond is always formed between the molecules of the same substance.
  • True
  • False
A species $$H_2O^+$$ pyramidal in shape. The number of lone pairs of electrons is:
  • 0
  • 1
  • 2
  • 3
When a chemical bond is formed, there is decrease in :
  • kinetic energy
  • potential energy
  • repulsive force
  • attractive force
The formal charge of the $$O$$ atoms in the ion is:
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  • $$-2$$
  • $$-1$$
  • $$0$$
  • $$+1$$
The number of bonding pairs electron  $$(X)$$ and lone pairs electron $$(Y)$$ around the central atom in the $${I}^-_3$$ ion are $$X +Y$$:
  • $$2 2$$
  • $$2 3$$
  • $$3 2$$
  • $$4 3$$
Which of the following molecules contain odd electron bonds?
  • $$H_2O$$
  • $$NO$$
  • $$NO_2$$
  • $$ClO_2$$
The number of $$\sigma$$ and $$\pi$$ bonds in $$C_2H_2$$ is:
  • 0 and 4
  • 2 and 2
  • 3 and 2
  • 4 and 2
Which of the following would not have a dipole moment?
(i)  $$CCl_4$$                            (iii) $$1, 2$$-dichloroacetylene
(ii) trans-$$1, 2$$-dichloroethene      (iv) $$CH_2Cl_2$$
  • (i) and (iv)
  • (i), (ii) and (iv)
  • (i), (ii) and (iii)
  • (ii) and (iii)
The heat of combustion of carbon to $$CO_2$$ is –393.5 kJ/mol. The heat released upon formation of 35.2 g of $$CO_2$$ from carbon and oxygen gas is:
  • -315kJ
  • +315kJ
  • -630Kj
  • +3.15kJ
In which of the following mixtures, the London dispersion force acts as a major intermolecular force of attraction?
  • Sodium chloride and water
  • Cyclohexane and carbon tetrachloride
  • Water and ethyl alcohol
  • Benzene and acetone
Which compound have maximum dipole moment?
0:0:1


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