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CBSE Questions for Class 11 Medical Chemistry Chemical Bonding And Molecular Structure Quiz 12 - MCQExams.com

The correct order of stability of Al+,Al+2,Al+3 is:
  • Al+3>Al+2>Al+
  • Al+2>Al+3>Al+
  • Al+2<Al+>Al+3
  • Al+3>Al+>Al+2
Bond-length of HCl is 1.275oA (e=4.8×1010 e.s.u.). If dipole moment =1.02D then HCl is:
  • 100% ionic
  • 83% covalent
  • 50% covalent
  • 40% ionic
The hybridisation of each carbon in the following compound is:
CH3iO||CiiCH2iiiCNiv
  • sp3 sp2 sp3 sp
  • sp3 sp3 sp2 sp
  • sp3 sp sp3 sp2
  • sp3 sp2 sp sp3
Arrange the molecule in the increasing order of bond angle.
  • H2O<OF2<OCl2
  • OCl2<H2O<OF2
  • OF2<OCl2<H2O
  • OF2<H2O<OCl2
Correct sequence of repulsion is:
  • Lone pair (LP)-Lone pair > Lone pair-bond pair (BP) > B.P B.P
  • B.P-B.P> B.P-L.P > L.P-L.P
  • B.P-B.P > L.P.-L.P. > BP-LP.
  • double bond-single bond < single bond-single bond < LP.-LP.
Which of the following is not the correct representation of sigma bond?
The number of σ and π bonds in orange azo dye is:
  • 27 and 5
  • 24 and 7
  • 26 and 7
  • 26 and 6
Among the following, the molecules with the lowest dipole moment is
In which of the following compound Cl-atom is involved in H-bonding ?
  • Chloral (CCl3CHO)
  • p-chlorophenol
  • o-chlorophenol
  • Hydrochloric acid
Which of the following overlap provides strongest bond?
  • sp3sp3
  • pp
  • ss
  • sp
Which of the following has been arranged in order of decreasing dipole moment?
  • CH_3Cl> CH_3F> CH_3Br>CH_3I
  • CH_3F> CH_3Cl> CH_3Br> CH_3I
  • CH_3Cl> CH_3Br>CH_3I> CH_3F
  • CH_3F> CH_3Cl> CH_3I> CH_3Br
Which of the following compound has highest dipole moment?
The percentage ionic character of a bond having 1.257A^0 its length and 1.03D its dipole moment is:
(q = 4.8 \times 10^{-10} esu)
  • 10\%
  • 15\%
  • 16.83\%
  • 18.88\%
Which one the following has the smallest dipole moment?
  • 1-Butene
  • Cis-2-Butene
  • Trans-2-Butene
  • 2-methyl-propene
Identify correct order of average molecular dipole moment.
  • P{Cl}_{3}{F}_{2}> {N}_{2}{O}_{4(g)}> {N}_{2}{O}_{4(s)}
  • P{Cl}_{3}{F}_{2}< {N}_{2}{O}_{4(g)}< {N}_{2}{O}_{4(s)}
  • P{Cl}_{3}{F}_{2}< {N}_{2}{O}_{4(g)}= {N}_{2}{O}_{4(s)}
  • All are incorrect.
The dipole moment of HBr is 1.6\times 10^{-30} c.m. and inter atomic spacing is 1\overset{o}{A}. The percentage ionic character of HBr is:
  • 10
  • 0
  • 15
  • 27
The number sp^2 - sp^2 sigma bonds in the compound given below is:
988162_7b08f124dd8040ee855d570520c8d3d9.PNG
  • 1
  • 3
  • 4
  • 5
The dipole moments of halo compounds are in the order:
  • CHCl_3 > CCl_4 > CH_2Cl_2 > CH_3Cl
  • CH_3Cl > CHCl_3 > CH_2Cl_2 > CCl_4
  • CH_3Cl > CH_2Cl_2 > CHCl_3 > CCl_4
  • CHCl_3 > CH_2Cl_2 > CH_3Cl > CCl_4
Which molecule contains both polar and nonpolar covalent bond?
  • NH_4Cl
  • HCN
  • CH_4
  • H_2O_2
Minimum dipole moment containing compound is:
Which of the following will show least dipole character?
  • Water
  • Ethanol
  • Ethane
  • Ether
Isostructural species are those which have the same shape and hybridisation. Among the given species, identify the isostructural pairs.
  • [NF_3 and BF_3]
  • [BF_4^- and NH_4^+]
  • [BCl_3 and BrCl_3]
  • [NH_3 and NO^-_3]
If a molecule MX_3 has zero dipole moment, the sigma bonding orbitals used by M (atomic number < 21) are:
  • pure p
  • sp hybrid
  • sp^2 hybrid
  • sp^3 hybrid
The number and type of bonds between two carbon atoms in calcium carbide are :
  • one sigma, one pi
  • one sigma, two pi
  • two sigma, one pi
  • two sigma, two pi
\triangle H of which of the following reaction is zero?
  • { H }_{ 2 }\left( g \right) \rightarrow { 2H }^{ + }\left( g \right) +{ 2e }^{ - }
  • 2H\left( g \right) +aq\rightarrow { 2H }^{ + }\left( aq \right) +{ 2e }^{ - }
  • 2H\left( g \right) \rightarrow { 2H }^{ + }\left( g \right) +{ 2e }^{ - }
  • { H }_{ 2 }\left( g \right) +aq\rightarrow { 2H }^{ + }\left( aq \right) +{ 2e }^{ - }
The total number of lone pairs of electrons in N_2O_3 is:
  • 6
  • 8
  • 5
  • none of these
Which of the following statement is correct?
  • Sigma bond is weaker than pie-bond
  • HF is less polar than HI
  • In NH^+_4 ions 4 coordinate bond is present
  • In SF_6 all S-F bond length are same
The compound with no dipole moment is:
  • methyl chloride
  • carbon tetrachloride
  • methylene chloride
  • chloroform
Which of the following molecules\ions does not contain unpaired electrons?
  • N^+_2
  • O_2
  • O^{2-}_2
  • B_2
Arrange the following compounds in order of increasing dipole moment :

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

Following is a diagram representation of standard reduction potential values. Which out of the following undergo disproportionation?


1035723_1a29c85df8c54891a9af18ff559c3efe.png
  • Cl{O^ - }
  • C{l_2}
  • Cl{O_2}
  • ClO_3^ -
In the given reaction:
{ \left[ Co{ \left( { NH }_{ 3 } \right)  }_{ 5 }{ H }_{ 2 }O \right]  }^{ 2+ }+{ NH }_{ 3 }\longrightarrow compound(Y)+{ e }^{ - }+{ H }_{ 2 }O
Compound (X)
Number of unpaired electron in compound X and compound Y are respectively:
  • (1,0)
  • (3,1)
  • (1,3)
  • (3,3)
Which conformation has non-zero dipolemoment? 
Bonds and lone pairs present in enolic form of butanone are?
  • 12\sigma bonds, 1\pi bond and 2 lone pairs of electrons
  • 11\sigma bonds, 1\pi bond and 2 lone pairs of electrons
  • 12\sigma bonds, 1\pi bond and 1 lone pairs of electrons
  • 10\sigma bonds, 2\pi bond and 2 lone pairs of electrons
A certain diatomic molecule, AB has dipole moment 1.6D and the inter-nuclear distance is 100pm. The percentage of electronic charge existing on more electronegative atom is:
  • 33%
  • 25%
  • 50%
  • 10%
Select the correct statement.
  • C is basic, whereas { \left( C{ F }_{ 3 } \right) }_{ 3 }N is not
  • PbCl_{2} melts at 606^{o}\ C. whereas PbCl_{4} melts at 114^{o}\ C.
  • NaCl is soluble is petrol
  • Dipole moment of BF_{3} is high
Which one of the following dipole moment order is correct?
  • CCl_4 > CH_2Cl_2 > CH Cl_3 > CH_3Cl
  • CH_3Cl > CH_2Cl_2 > CH Cl_3 > CCl_4
  • CH_2Cl _2> CH_3Cl > CH Cl_3 > CCl_4
  • CHCl _3> CH_2Cl_2 > CH_3 Cl > CCl_4
When 2-butyne is treated with H_2/Lindlar's catalyst, compound X is produced as the major product and when treated with Na/liq. NH_3 it produces Y as the major product. Which of the following statements is correct?
  • X will have higher dipole moment and higher boiling point than Y
  • Y will have higher dipole moment and higher boiling point than X
  • X will have lower dipole moment and lower boiling point than Y
  • Y will have lower dipole moment and lower boiling point than X
When {O}_{2} is converted into {O}_{2}^{+}
  • both paramagnetic character and bond order increases
  • bond order decreases
  • paramagnetic character increases
  • paramagnetic character decreases and the bond order increases
The dipole moment of hydrogen chloride with bond distance 1.27A^o is 1.03\ DThe percent ionic character of its bond is?
  • 15
  • 17
  • 19
  • 21
Which of the following compound has \mu =0?
  • CCl_4
  • CHCl_3
  • HF
  • NH_3
Number and type of bonds between two carbon atom in CaC_{2} are :
  • one (\sigma )\ and\ one(\pi )\ bonds
  • one (\sigma )\ and\ two(\pi )\ bonds
  • 3 (\sigma)\ and 2(\pi )\ bonds
  • one (\sigma)\ bond
Dipole moment of H_2O is 1.84 D.If the bond angle is 105^o and O-H bond length is 0.94 AA ,what is the magnitude of charge on the atom in water molecules?
  • 2\times10^{-10} esu
  • 3.28\times10^{-10} esu
  • 3.22\times10^{-10} esu
  • 1.602\times10^{-19} C
The molecule which have zero dipole moment is
  • {CH}_{2}{Cl}_{2}
  • {BF}_{3}
  • {NF}_{3}
  • {IF}_{3}
Dipole moment is shown by?
  • 1, 2-dichlorobenzene
  • trans 2, 3-dichloro-2-butene
  • 1, 4-DIchlorobenzene
  • trans-1, 2-dinitroethene
Dative bond is not present in ?
  • NH_{4}^{+}
  • N_{2}O
  • BCl_{3}
  • B_{3}N_{3}H_{6}
Consider the following three halides:
(i) {CH}_{3}-{CH}_{2}Cl
(ii) {CH}_{2}=CH-Cl
(iii) {C}_{6}{H}_{5}-Cl
Arrange C-Cl bond lenght of these compounds in decreasing order:
  • i> ii> iii
  • i> iii> ii
  • iii> ii> i
  • ii> iii> i
A reagent which lowers the oxidation number of an element in a given substance is known as
  • oxidation agent 
  • reduction 
  • reducing agent 
  • oxidation 
Which of the following has zero dipole
  • {BF}_{3}
  • BeClBr
  • {CH}_{2}{Cl}_{2}
  • COS
The X-X bond length is 1.00\mathring{A} and C-C bond length is 1.54\mathring{A}. The C-X bond length is likely to be
  • 0.80\mathring {A}
  • 1.18\mathring {A}
  • 1.57\mathring {A}
  • 1.68\mathring {A}
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Practice Class 11 Medical Chemistry Quiz Questions and Answers