CBSE Questions for Class 11 Medical Chemistry Chemical Bonding And Molecular Structure Quiz 7 - MCQExams.com

The dipole moment of is $$1.5\ D$$. The dipole moment of?
1119897_34e34c9cef4543d0b06aa8ac7f4aa57f.png
  • $$0\ D$$
  • $$1.5\ D$$
  • $$2.86\ D$$
  • $$2.25\ D$$
The molecular orbital shown below can be described respectively as ?
1121443_f02e2ec0809b4841bf3c9eb1c9f707c2.GIF
  • $$\sigma, \sigma^-$$
  • $$\pi, \pi^-$$
  • $$\pi^-, \pi$$
  • $$\pi^-, \sigma^-$$
$$16$$g of sulphur completely reacts with $$38$$ g of $$F_2$$ to form $$SF_x$$. The value of $$x$$ is: 
(Atomic mass of $$F = 19$$)
  • $$1$$
  • $$2$$
  • $$4$$
  • $$6$$
In the given structure of compound, the correct various bond moments direction involving atoms are shown as:
  • $$Br\overset{\longleftarrow}{-}N\overset{\longleftarrow}{-}CH_2\overset{\longrightarrow}{-}SiH_2\overset{\longleftarrow}{-}H_2\overset{\longrightarrow}{-}O\overset{\longleftarrow}{-}CH_3$$
  • $$Br\overset{\longleftarrow}{-}N\overset{\longleftarrow}{-}CH_2\overset{\longleftarrow}{-}SiH_2\overset{\longleftarrow}{-}CH_2\overset{\longrightarrow}{-}O\overset{\longleftarrow}{-}CH_3$$
  • $$Br\overset{\longrightarrow}{-}N\overset{\longleftarrow}{-}CH_2\overset{\longleftarrow}{-}SiH_2\overset{\longrightarrow}{-}CH_2\overset{\longrightarrow}{-}O\overset{\longleftarrow}{-}CH_3$$
  • $$Br\overset{\longleftarrow}{-}N\overset{\longrightarrow}{-}CH_2\overset{\longrightarrow}{-}SiH_2\overset{\longleftarrow}{-}CH_2\overset{\longrightarrow}{-}O\overset{\longrightarrow}{-}CH_3$$
On treatment of the following compound with a strong acid, the most susceptible site for bond cleavage is:
1121871_f1d1be8250f54b42ae020434072c674c.GIF
  • $$C1-O2$$
  • $$O2-C3$$
  • $$C4-O5$$
  • $$O5-C6$$
Which of the following molecule is theoretically not possible?
  • $$SF_4$$
  • $$OF_2$$
  • $$OF_4$$
  • $$O_2F_2$$
Which combination of atomic orbital is correct for $$\sigma$$-bond formation?
  • $$s - P_z$$
  • $$s - P_x$$
  • $$s - P_y$$
  • All are correct
What is the nature of chemical bonding between $$Cs$$ and $$F$$?
  • lonic
  • Covalent
  • Coordinate
  • Metallic
$$3B_2H_6 + 6NH_3\xrightarrow [ low{\,}T ]{ slow{\,} heating }3X\xrightarrow{Heat}2Y + 12H_2 $$. In the anionic part of the intermediate $$X$$ covalency of the central atom is:
  • $$2$$
  • $$4$$
  • $$6$$
  • $$8$$
$$NH_3$$(excess) $$+ 3Cl_2\rightarrow A+N_2\uparrow$$; the bond present in compound $$A$$ is?
  • Ionic, Covalent and dative
  • Ionic and covalent
  • Dative and ionic
  • Dative only
What is correct increasing order of bond lengths of bond indicated as $$I, II, III,$$ and $$ IV$$ in the following compounds?
1126343_95ce7a01f48e4947a8b0928d2746eec6.png
  • $$I < II < III < IV$$
  • $$II < III < IV < I$$
  • $$IV < II < III < I$$
  • $$IV < I < II < III$$
Lone pair of electrons are electrons in orbitals?
  • Which does not undergo hybridization
  • Which undergoes hybridization
  • Which undergoes hybridisation and participate in Bond formation
  • Which undergo hybridization but not participate in Bond formation
Correct order of dipole moment is:
  • $$CH_3F > CH_3Cl > CH_3Br > CH_3I$$
  • $$CH_3F > CH_3Br > CH_3Cl > CH_3I$$
  • $$CH_3Cl > CH_3F > CH_3Br > CH_3I$$
  • $$CH_3F > CH_3I > CH_3Cl > CH_3Br$$
Among the following molecular orbitals, how many have at least one nodal plane ?
$$ \sigma ^*1s,\sigma 2s,\sigma ^{ * }2p_{ z },\pi 2p_{ x },\pi ^{ * }2p_{ y },\sigma 2p_{ z } $$
  • $$ 4 $$
  • $$ 5 $$
  • $$ 2 $$
  • $$ 6 $$
The increasing order of dipole moment
A.  $${ SO }_{ 2 }(X), $$     $$B.$$$$ \quad { H }_{ 2 }O(Y),$$      $$ C.$$$$\quad { CO }_{ 2 }(Z)$$  $$is$$  [ $$X>Y>Z$$ ]
  • True
  • False
In the given, lewis structure of $${ S }_{ 2 }{ O }_{ 3 }^{ 2- }$$ formal charge present on sulphur atoms $$1$$ and $$2$$ respectively are:
1131583_ec55d72352944d3f88ce6362414b23f0.png
  • $$zero, \ +1$$
  • $$+1,+1$$
  • $$+2,+2$$
  • $$zero, \ zero$$
1 mole of $$H_3PO_4$$ having
  • Two $$\pi $$- bond
  • six mole of $$\sigma $$-bond
  • Sixteen lone pair of electron
  • seven  $$\sigma $$-bond
Which bond angle $$\theta$$ would result the maximum dipole moment for the triatonuc molecules $$XY_2$$ as shown below?
1130124_6099a52aef8340669f51f3958dd25aff.png
  • $$90^o$$
  • $$120^o$$
  • $$150^o$$
  • $$180^o$$
In $$P_4O_6$$, the number of $$P-O$$ bonds and number of lone pairs on $$P$$ are:
  • 12 and 4
  • 8 and 8
  • 12 and 16
  • 12 and 12
For which of the above molecules dipole moment $$\mu \neq 0$$?

1128319_d27779045132427ebc57659b1998bcf1.png
  • Only (c)
  • (c) and (d)
  • only (a)
  • (a) and (b)
Which of the following has dipole moment ?
  • $$H_2S$$
  • $$CO_2$$
  • $$CCl_4$$
  • $$BF_3$$
Which of the following has the weakest carbon-chloride bond?
  • $$CH_2=CH-CI$$
Find out the species with zero dipole moment
(i) $$trans-{CH}_3{CH}=CHCI$$
(ii) $${CS}_{2}$$
  • only one 
  • i and ii
  • ii only
  • none of these
The inter nuclear distance in $$H_2$$ and $$Cl_2$$ molecules are $$74$$ and $$198$$ pm. respectively. The bond length of $$HCl$$ may be:
  • $$136 \,pm$$
  • $$272 \,pm$$
  • $$135.919 \,pm$$
  • $$271.919 \,pm$$
Non - zero dipole moment is shown by :
  • $$CCl_4$$
  • $$CS_2$$
  • $$H_2O$$
  • $$p-Cl-C_6H_4-Cl$$
Which of the following has zero value of dipole moment:
  • Benzene
  • Naphthalene
  • p-dichlorobenzene
  • all the these
Which of following has been arranged in order of decreasing dipole moment?
  • $$CH_{3}CI> CH_{3}F> CH_{3}Br> CH_{3}I$$
  • $$CH_{3}F> CH_{3}CI> CH_{3}Br> CH_{3}I$$
  • $$CH_{3}CI> CH_{3}Br> CH_{3}I> CH_{3}F$$
  • $$CH_{3}F> CH_{3}CI> CH_{3}I> CH_{3}Br$$
Most acidic among the following is
With a change in hybridization of the carbon bearing the charge, the stability of a carbanion decreases in the order
  • $$sp < { sp }^{ 2 } < { sp }^{ 3 }$$
  • $$sp < { sp }^{ 3 } < { sp }^{ 2 }$$
  • $${ sp }^{ 3 } < { sp }^{ 2 } < sp$$
  • $${ sp }^{ 2 } < sp < { sp }^{ 3 }$$
Which of the following molecules(s) have dipole moment?
I)$$Trans-pent-2-ene$$
II)$$cis-hex-3-ene$$
III)$$2,2-Dimethyl propane$$
IV)$$2,2,3,3-tertramethyl butane$$
  • I,II
  • II,III
  • I,III
  • I,IV
The number of antibonding electron paris in $${O}_{2}^{2-}$$ molecular ion on the basis of molecular orbital theory are (At. no $$O=8$$)
  • $$2$$
  • $$3$$
  • $$4$$
  • $$5$$
Which of the following is the decreasing order of their dipole moments?
  • $${NH}_{3}> {BF}_{3}> {NF}_{3}$$
  • $${NH}_{3}> {NF}_{3}> {BF}_{3}$$
  • $${BF}_{3}> {NH}_{3}> {NF}_{3}$$
  • $${BF}_{3}> {NF}_{3}> {NH}_{3}$$
Formal charge on nitrogen and oxygen in $$NO^-_3$$ ion are respectively: 
  • $$0, \dfrac{-1}{3}$$
  • $$+1, \dfrac{-1}{3}$$
  • $$+1, \dfrac{-2}{3}$$
  • $$0, \dfrac{-2}{3}$$
The compoumd with no dipole moment is:
  • $${CH}_{3}Cl$$
  • $$C{Cl}_{4}$$
  • methylene chloride ($${CH}_{2}{Cl}_{2}$$)
  • chloroform ($$CH{Cl}_{3}$$)
WHich of the following substance has dipole moment more than zero?
  • Water
  • Methane
  • Carbon dioxide
  • Nitrogen
Effective overlapping will be shown by :
  • All of these
The dipole moment of m-dichlorobenzene is 1.5 D. The value of dipole moment of o-dichlorobenzene is
  • 0.02 D
  • 1.5 D
  • 2.6 D
  • 2.12 D
Molecule AB has a bond length of 1.617 A and a dipole moment of 0.38 D. The fractional charge on each atom (absolute magnitude) is :
 ($${ e }_{ 0 }=\quad 4.802\quad \times \quad { 10 }^{ -10 }$$ esu)
  • $$0$$
  • $$0.05$$
  • $$0.5$$
  • $$1.0$$
Which of the following involves transfer of five electrons?
  • $$MnO_4^ - \to M{n^{2 + }}$$
  • $$CrO_4^{2 - } \to C{r^{3 + }}$$
  • $$MnO_4^{2 - } \to Mn{O_2}$$
  • $$C{r_2}O_7^{2 - } \to 2C{r^{3 + }}$$
The correct order of increasing bond angles in the following triatomic species is
  • $$NO_2^+ < NO_2 < NO_2^-$$
  • $$NO_2^+ < NO_2^- < NO_2$$
  • $$NO_2^- < NO_2^+ < NO_2$$
  • $$NO_2^- < NO_2 < NO_2^+$$
Which of the following statements is true about hybridization ?
  • Hybrid orbitals frequently undergo linear overlaps making sigma bonds.
  • Hybrid orbitals frequently undergo lateral overlaps maing $$\pi$$-bonds. In other words, there are several compounds in which $$\pi$$-bonds are formed using hybrid orbitals.
  • Hybrid orbitals are molecular orbitals.
  • A hybrid orbital bigger in size makes shorter bond.
Which one of the following has the strongest $$O-O$$ bond?
  • $$O_{2}^{+}$$
  • $$O_{2}$$
  • $$O_{2}^{-}$$
  • $$O_{2}^{2-}$$
In 2sp hybridization, 2s-orbital can be mixed with
  • Only $$2p_x$$
  • Only $$2p_y$$
  • Only $$2p_z$$
  • Any one of $$2p_x,2p_y$$ and $$2p_z$$
One of the resonating structure of $$SO_{4}^{-2}$$ is as shown.
Which set formal charge on oxygen and bond order is correct?
1154766_a1f7d649f4144038854f78abd0b0592c.png
  • $$-0.5$$ and $$1.5$$
  • $$1.5$$ and $$3$$
  • $$2$$ and $$3$$
  • $$1.5$$ and $$1.5$$
If the dipole moment  of $$C-Cl$$ bond is $$1.2$$ $$D$$,   then the resulting value of dipole moment in:
1178317_9f2e23389cbd440f8f6a5d741c41f72b.png
  • $$1.2$$ and $$0.6$$ respectively
  • $$0.6$$ and $$1.2$$ respectively
  • Less than $$1.2$$ $$D$$  and more than $$1.2$$ $$D$$   respectively
  • More than $$1.2$$ $$D$$ in both
Which of the following has least dipole moment:
  • $$NF_3$$
  • $$CO_2$$
  • $$SO_2$$
  • $$NH_3$$
The bond angle and hybridization in ether $$(CH_3OCH_3)$$ is ______.
  • $$106.51^0 ,  sp^{2}$$
  • $$110^0$$ , $$sp^3$$
  • $$109.28^0,  sp^3$$
  • None of these.
Choose  the correct options:
  • In $$O_2F_2$$, the $$O-F$$ bond length is lesser than expected value.
  • In trislyl amine $$(SiH_3)_3$$N, the bond length is lesser than expected value
  • The bond angle in $$OF_2$$ is lesser than in $$Cl_2O$$
  • The Be atom in $$BeCl_2(s)$$ is $$sp^3$$ hybridised.
The dipole moment of chlorobenzene is $$1.73 D$$. The dipole moment of $$p-dichlorobenzene$$ is excepted to be:
  • $$3.46 D$$
  • $$0.00 D$$
  • $$1.73 D$$
  • $$1.00 D$$
Which of the following has the highest dipole moment?
  • $$AsH_3$$
  • $$SbH_3$$
  • $$PH_3$$
  • $$NH_3$$
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