CBSE Questions for Class 11 Medical Chemistry Chemical Bonding And Molecular Structure Quiz 14 - MCQExams.com

Diatomic molecule has a dipole moment of 1.2 D.If its bond is $$1.0 \mathring{A}$$, what fraction of an electronic charge exists on each atom? 
  • 11 %
  • 20 %
  • 25 %
  • 15 %
The acid containing S-O-O-S bond is 
  • $$H_2SO_5$$
  • $$H_2S_2O_7$$
  • $$H_2S_2O_6$$
  • $$H_2S_2O_8$$
The increasing order of dipole moment is 
  • $$C{H_3}I < C{H_3}Br < C{H_3}CI < C{H_3}F$$
  • $$C{H_3}F < C{H_3}CI < C{H_3}Br < C{H_3}I$$
  • $$C{H_3}I < C{H_3}Br < C{H_3}F < C{H_3}CI$$
  • $$C{H_3}I < C{H_3}F < C{H_3}Br < C{H_3}CI$$
In $$Fe{(CO)}_{5}$$, the $$Fe-C$$ bond possess:
  • $$\sigma$$-character only
  • $$\pi$$-character only
  • both $$\sigma$$ and $$\pi$$ characters
  • ionic character
In which of the following molecules number of lone pairs and bond pairs on central atom are not equal?
  • $$H_2O$$
  • $$I^-_3$$
  • $$O_2F_2$$
  • $$SCl_2$$
Carbon has a Covalency of 2 in CO and 4 in $$C{O_2}$$ and $$C{H_4}$$.

Its valency in $${C_2}{H_2}\,$$ is :
  • 3
  • 4
  • 2
  • 1
Coordinate bond is not present in
  • $$BF_{4}^{-}$$
  • $$CO_{3}^{2-}$$
  • $$AlCl_{4}^{-}$$
  • $$Any\ of\ these$$
In $${ PO }_{ 4 }^{ 3- }$$ ion, the formal charge on each oxygen atom and $$P-O$$ bond order respectively.
  • $$-0.75, 0.6$$
  • $$-0.5, 1.0$$
  • $$-0.75, 1.25$$
  • $$-3.0, 1.5$$
Which of the following statement is wrong:
  • Hybridisation is the mixing of atomic orbitals prior to their combining into molecular orbitals
  • $$sp^2$$ hybrid orbital are formed from two p atomic orbitals and one s atomic orbital
  • $$dsp^2$$ hybrid orbitals are all at $$90^o$$ to one another
  • $$sp^3d^2$$ hybrid orbitals are directed towards the corners of a regular tetrahedron
Physical properties of compound depend on:
  • primary forces present in the compound
  • secondary forces present in the compound
  • bond angle of the molecule
  • shape of the molecule
C-H bond distance is longest in __________ .
  • $$ C_2H_2 $$
  • $$ C_2H_4 $$
  • $$ C_2H_6 $$
  • $$C_3H_6$$
For the following geometry, which of the ineqquality is/are correct ?
1504059_13cc0d4e667f4b128af7b3f2d5c8e99a.PNG
  • $$ { \theta }_{ 1 }^{ ' }<{ \theta }_{ 1 } $$
  • $$ { \theta }_{ 2 }<{ \theta }_{ 2 }^{ ' } $$
  • $$ { \theta }_{ 1 }<{ \theta }_{ 1 }^{ ' } $$
  • $$ { \theta }_{ 2 }>{ \theta }_{ 2 }^{ ' } $$
Compound having zero dipole moment is 
  • $${\text{C}}{{\text{H}}_{\text{3}}}{\text{Cl}}$$
  • $${\text{C}}{{\text{H}}_{\text{2}}}{\text{C}}{{\text{l}}_{\text{2}}}$$
  • $${\text{CHC}}{{\text{l}}_{\text{3}}}\;$$
  • $${\text{CC}}{{\text{l}}_{\text{4}}}$$
Of the following molecules, the one, which has permanent dipole moment, is-
  • $$\mathrm { SiF } _ { 4 }$$
  • $$\mathrm { BF } _ { 3 }$$
  • $$\mathrm { PF } _ { 3 }$$
  • $$\mathrm { PF } _ { 5 }$$
Which element has variable covalency ? 
  • F
  • I
  • H
  • O
Which of the following element shows maximum valency?
  • Carbon
  • Barium 
  • Nitrogen
  • Sulphur
Arrange the following compounds in decreasing order of their dipole moment. 
               I                                          
$${\text{C}}{{\text{H}}_{\text{3}}} - {\text{C}}{{\text{H}}_{\text{2}}} - \;{\text{N}}{{\text{O}}_{\text{2}}}\;$$
               II
$${\text{C}}{{\text{H}}_{\text{3}}} - {\text{C}}{{\text{H}}_{\text{2}}} - \;{\text{N}}{{\text{H}}_{\text{2}}}\;$$
              III
 $${\text{C}}{{\text{H}}_{\text{3}}} - {\text{C}}{{\text{H}}_{\text{2}}} - \;{\text{F}}\;$$
             IV
$${\text{C}}{{\text{H}}_{\text{3}}} - {\text{C}}{{\text{H}}_{\text{2}}} - \;{\text{CN}}$$
  • $$IV > III > I > II$$
  • $$IV > I > III > II$$
  • $$I > III > IV > II$$
  • $$I > IV > III > II$$
In which of the following the experimental dipole moment is more  than what is expected from theory 
  • All of these
Find the correct option.
  • $${ NH }_{ 3 }<{ NF }_{ 3 }$$ (Dipole moment)
  • $${ CO }<{ CO }_{ 2 }$$ [C-O bond length]
  • $${ NH }_{ 2 }^{ - }>{ NH }_{ 4 }^{ + }$$ (Bond angle)
  • $${ I }_{ 3 }^{ - }<{ N }_{ 3 }^{ - }$$ [lone pairs]
Correct order of dipole moment is :
1) I = II = III              2) I < II < III
3) I > II > III              4) II < III < I
1560734_ed25a2092dd44233b16da07f1eec1f0d.JPG
  • 1
  • 2
  • 3
  • 4
Number of sigma bonds in $$CH_{4}$$ is:
  • 4
  • 2
  • 3
  • 5
In which of the following pairs , the hybridisation of central atmos  is same but molecular geometry is not the same ? 
  • $${ SO }_{ 3 },{ CO }_{ 3 }^{ 2- }$$
  • $${ SO }_{ 3 }^{ 2- },{ NH }_{ 3 }$$
  • $${ PCl }_{ 5 },{ POCl }_{ 3 }$$
  • $${ XeF }_{ 2 },{ ICl }_{ 3 }$$
Which theory is useful to determine geometrical structure of molecules ? 
  • Molecular orbital theory
  • VSEPR theory
  • Resonance theory
  • Quantam mechanics
Number of $$  (\sigma)-  $$ bonds present in $$ \mathrm{CH}_{4} $$ is:
  • 4
  • 3
  • 2
  • 1
Which type of bond is present in $$Xe$$ molecules ?
  • Covalent
  • Ion-dipole
  • Van der Waals
  • Dipole-dipole
Which of the following statement is incorrect?
  • The tendency to attract bonded pair of the electron in case of hybrid orbitals follows the order:   $$sp > sp^2 > sp^3$$
  • Alkali metals generally have negative value of electron gain enthalpy
  • $$Cs^+(g)$$ releases more energy upon gain of an electron than $$Cl(g)$$
  • The electronegativity values for $$2$$p-series elements is less than that for $$3$$p-series elements on account of small size and high inter electronic configuration
Bond distance in HF is $$9.17\times10^{-11}\ m$$. The dipole moment of $$HF$$ is $$6.104\times10^{-30}$$.The percent ionic character in $$HF$$ will be: (electron charge $$=1.60\times10^{-19}$$ C)
  • $$61.0\%$$
  • $$38.0\%$$
  • $$35.5\%$$
  • $$41.5\%$$
In the following  i. $$ N_2 \rightarrow N^+_2 \quad ii. O_2 \rightarrow O^+_2 ;\quad $$the electrons respectively are removed from 
  • $$ ( {\sigma } 2 p_z)\ and\  ( \pi^* 2p_y\ or\ \pi^* 2 p_x ) $$
  • $$ ( \pi^* 2 p_x )\ and\ ( \pi^* 2p_y\ or\ \pi^* 2 p_x ) $$
  • $$ ( \pi^* 2 p_y  )\ and\ ( \pi^* 2p_y\ or\ \pi^* 2 p_x ) $$
  • $$ ( \pi^* 2 p_z)\ and\ ( \pi^* 2p_y\ or\ \pi^* 2 p_x ) $$
The sum of $$ \sigma $$ and $$ \pi $$ -bonds present in the given molecule is 
1562670_01b4b743a4bb412e8b93ba1781751838.PNG
  • 26
  • 28
  • 29
  • 30
Number of lone pair present in each molecule of $$H_2O , NH_3$$ and $$C_2H_4$$ respectively.
  • $$1, 2, 1$$
  • $$2, 1, 0$$
  • $$1, 1, 1$$
  • $$2, 1, 2$$
Which of the following represent $$sp - sp - sp^2 - sp - sp^2 - sp^3$$ hybridization from left to right order?
  • $$CH_2= CH - C = \overset{H}{\overset{|}{C}} - C \equiv N$$
  • $$CH \equiv C - CH = C = CH-CH_3$$
  • $$N \equiv C - \overset{H}{\overset{|}{C}} - \underset{H}{\underset{|}{C}} - CH - CH_3$$
A molecule $$(X)$$ has (i) four sigma bonds formed by the overlap of $$sp^{2}$$ and $$s$$ orbitals; (ii) one sigma bond formed by $$sp^{2}$$ and $$sp^{2}$$ - orbitals and (iii) one $$\pi-bond$$ formed by $$p_{z}$$ and $$p_{z}$$ orbitals. Which of the following is $$X$$?
  • $$C_{2}H_{6}$$
  • $$C_{2}H_{5}Cl$$
  • $$C_{2}H_{2}Cl_{2}$$
  • $$C_{2}H_{4}$$
Select the correct statement :
  • If molecule has any polar bond, then it is always polar
  • Solubility of noble gases increases in water down the group when their size increases because London dispersion force increases
  • First ionization energy of Al is greater than that of gallium
  • $$ XeF^{ \oplus}_5 $$ has disorted octahedral geometry
In which of the following, the number of orbital dipoles is equal to the numebr of bonds moments?
  • $$PCl_3$$
  • $$SO_3$$
  • $$O_3$$
  • $$H_2O$$
The number and types of bonds between two carbon atoms in calcium carbide is:
  • one sigma, two pi
  • one sigma, one pi
  • tow sigma, one pi
  • two sigma, two pi
Arrange the following compounds in order of increasing dipole moments,
Toluene (I), m-dichlorobenzene (II), o -dichlorobenzene (III), & p-dichlorobenzene (IV) 
  • I < IV < II < III
  • IV < I < II < III
  • IV < I < III < II
  • IV < II < I < III
Find out the similarities between $$ I_2Cl_6 $$ and $$ Al_2Cl_6 .$$ 
  • Both have $$3\ C -4e^-$$ bond
  • Both have $$ sp^3 $$ hybridization for the central atom
  • Both are non planar
  • All are correct
Back bonding always changes
  • bond angle
  • hybridisation of central atom
  • planarity
  • bond length
What will be the value of formal charge of individual atom of $$O_3$$ molecule :-
  • +1, +1, +1
  • 0, +1, -1
  • 0, 0, 0
  • +2, -2, 0
Which bond properties are consistent with one another?
  • Bond order- Higher, Bond length- Shorter, Vibrational frequency- higher
  • Bond order- Higher, Bond length- longer, Vibrational frequency - lower
  • Bond order- Lower, Bond length - shorter, Vibrational frequency- lower
  • Bond order- Lower, Bond length- longer, Vibrational frequency - higher
Which type of bond is present in $$ [ BeF_2]_n $$ polymer ?
  • $$ 3C-2e^- $$
  • $$ 3C-4e^- $$
  • $$ 2C-3e^- $$
  • None of these
Select the correct statement(s): 
  • the tendency of polymerization of the oxyanions lies in the sequence:

    $$ SiO^{4-}_4 > PO^{3-}_4 > SO^{2-}_4> ClO^{2-}_4 $$
  • the molecular structure of $$ S_4N_4H_4$$ and $$S_4N_4F_4 $$ are different
  • the bond strength of P-O linkage is maximum in $$ OPF_3 $$ compared to all other analogous halogen compounds
  • The structural geometries of $$ NO
    ^+_2$$ and $$NO_2 $$ are different
An example of molecule having a three center bond is:
  • $$NH_3$$
  • $$ H_3 BO_3 $$
  • $$ NaBH_4 $$
  • $$ B_2H_6 $$
Which of the following sets of the molecule(s) is/are having a V-shape but different hybridization? 
  • $$SnCl_2$$ and $$H_2O$$
  • $$SO_2$$ and $$NO^+_2$$
  • $$BF^-_2$$ and $$SCl_2$$
  • $$OF_2$$ and $$SCl_2$$
In V.B.T., the idea of hybridization was required to explain which of the following facts: 
  • The equivalence of the bonds in most of the com-pounds
  • The stereochemistry of the molecules
  • The better overlapping of the orbitals
  • None of these
The bond order of $$ O_2^+ $$ is:
  • $$1$$
  • $$1.5$$
  • $$2.5$$
  • $$3$$
Select the correct statement(s):
  • Para-dihydroxy benzene is polar while para-dimethy benzene is non-polar
  • Dipole moment of $$ NH_3 $$ is larger than that of $$ NF_3 $$
  • The direction of dipole moment in $$CO$$ is from $$C$$ to oxygen
  • All are incorrect
Choose the incorrect statement:
  • All $$S-F$$ bond length are identical in $$ SF_4. $$
  • All $$Cl-F$$ bond length are identical in $$ ClF_3 .$$
  • All $$\angle FClF $$ angles are identical in $$ ClF_3.$$
  • All possible angle in $$ BF_2Cl$$ are $$ 120^0 .$$
Which of the following molecules/ions are all the bonds not equal?
  • $$ SF_4 $$
  • $$ SiF_4 $$
  • $$ XeF_4 $$
  • $$ BF_4^- $$
Which are the correct statements for $$ NO_2 $$? 
  • It is paramagentic and dimerizes to $$ N_2O_4 $$
  • $$ N_2O_4 $$ is plannar and diamagnetic
  • $$ NO_2 $$ is linear containing an odd number of electrons
  • $$N-O$$ bonds in $$ NO_2 $$ are of different lengths
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