CBSE Questions for Class 11 Medical Chemistry Chemical Bonding And Molecular Structure Quiz 9 - MCQExams.com

Among the following molecules in increasing order of $$\sigma$$ to $$\pi$$ bond ratio.
1717823_dfa87f4e6e1b4a6da377f61f9a2915bb.PNG
  • $$2 < 3 < 4 < 1$$
  • $$2 < 4 < 3 < 1$$
  • $$3 < 2 < 1 < 4$$
  • $$2 < 3 < 1 < 4$$
The enolic form of butanone contains?
  • $$12\sigma$$ 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 pair of electrons
  • $$10\sigma$$ bonds, $$2\pi$$ bonds and $$2$$ lone pairs of electrons
  • $$13\sigma$$ bonds, $$1\pi$$ bonds and $$2$$ lone pairs of electrons
The dipole moment of $$ CH_3 F $$ is greater than that $$ CH_3 Cl $$ 
  • True
  • False
In the group the carbonyl carbon is joined to other atoms by:
1719721_c7bc2531597341f2a4228bff7e290d78.PNG
  • two sigma and one pi bond
  • three sigma and one pi bond
  • two sigma and two pi bonds
  • three sigma and two pi bonds
A compound with molecular formula $$C_{4}H_{6}$$ may contain.
  • two double bond
  • Two double bonds or a triple bond
  • A triple bond
  • All single bonds
Which cholrine atom is more electronegative in the following ?
  • $$ CH_3CI $$
  • $$ CH_3CH_2CI $$
  • $$ (CH_3)_2CHCI $$
  • $$CH_3 CH_2 - \underset{Cl}{\underset{|}{C}} - (CH_3)_2$$
Find the incorrect match.
  • $$ Al_2Cl_6$$ : $$3C-4e$$ bond is present
  • $$ Al_2(CH_3)_6$$ : All carbon atoms are $$ sp^3 $$ - hybridized
  • $$ I_2Cl_6 $$ : Nonplanar
  • $$ Al_2Br_6 $$ : Nonpolar
$$d_{x^2-y^2}$$ orbital is involved in which of the following hybridization?
  • $$sp^3d$$ (sq. pyramidal)
  • $$dsp^2$$
  • $$sp^3d^2$$
  • $$sp^3d^3$$
Which of the following does not contain three electron bond?
  • $$ ClO_2 $$
  • $$ CO_2 $$
  • $$ O_2^-$$
  • $$ NO $$
Which of the following molecule/ion has a zero dipole moment?
  • $$ ClF_3 $$
  • $$ ICl_2^- $$
  • $$ SF_4 $$
  • None of these
Which is/are not correct for $$ B_2H_6 $$ structure ?
  • It has $$4B-H$$ terminal bonds and two $$3C-2e$$ bonds
  • It has six $$B-H$$ terminal bonds and one $$3C-2e$$ bond
  • It has four $$B-H$$ terminal bonds two $$3C-2e$$ bonds and one B-B bond
  • It has interaction between $$ [BH_2]^+$$ and $$[BH_4]^- $$
Linear combination of two hybridized orbitals, belonging to two atoms and each having one electron, leads to:
  • Sigma-bond
  • Double bound
  • Coordinate covalent bond
  • Pi-bond
Select the correct order :
  • Bond Strength : $$ NO^- < NO < NO^+ $$
  • N-O bond angle : $$NO^+_2 < NO^-_2 < NO^-_3$$
  • Thermal stability : $$ LiF > NaF >KF >RbF > CsF $$
  • Hydrated size : $$ Be^{2+} (aq) < Mg^{2+} (aq) < Ca^{2+} (aq) < Sr^{2+} (aq) < Ba^{2+}(aq) $$
The bond between two identical non metal atoms has a pair of electron
  • unequally shared betweem the two
  • transferred fully from one atom to another
  • with identical spins
  • equally shared between them
The bond between $$B$$ and $$C$$ will be 
  • Ionic
  • Covalent
  • Hydrogen
  • Cordiante
Among the following species, identify the isostructural pairs:

$$ NF_3,\ NO^-_3,\ H_3O^+ ,\ N_3H,\ BF_3 $$
  • $$ [NF_3,\  NO^-_3]$$ and $$[ BF_3, \ H_3O^+] $$
  • $$[ NF_3,\ N_3H]$$ and $$[ NO^-_3,\ BF_3 ]$$
  • $$ [NF_3 ,\ H_3O^+]$$ and $$[ NO^-_3, \ BF_3] $$
  • $$ [NF_3,\ H_3O^+ ] $$ and $$ [N_3H,\ BF_3 ] $$
All molecules with polar bonds have dipole moment.
  • True
  • False
Which of the following compounds has a zero dipole moment?
  • 1,1 - dichlorethylene
  • cis -1,2 - dichlorocthylene
  • trans -1,2 - dichloroethylene
  • none of the above
On hybridization of one s- and one p-orbital we get :
  • Two mutually perpendicular orbitals
  • Two orbitals at $$ 180^0 $$
  • Four orbitals directed tetrahedrally
  • Three orbitals in a plane
The number of lone pairs of electrons in $$XeF_2, XeF_4, XeF_6$$ and $$XeOF_2$$ are respectively:
  • $$3,2,1,2$$
  • $$2,1,1,2$$
  • $$3,2,1,1$$
  • $$3,2,2,2$$
The number and type of bonds between two carbon atoms in $$ CaC_2 $$ are :
  • One $$ \sigma $$ and one $$ \pi $$ bond
  • One $$ \sigma $$ and two $$ \pi $$ bond
  • One $$ \sigma $$ and one-half $$ \pi $$ bond
  • One $$ \sigma $$ bond
Acetylene molecule contains:
  • 5 sigma bonds
  • 4 sigma and $$ 1 \pi - bond $$
  • 3 sigma and $$ 2\pi - bonds $$
  • 2 sigma and $$ 3 \pi-bonds $$
A molecule possessing dipole moment is:
  • $$ CH_4 $$
  • $$ H_2 O $$
  • $$ BF_3 $$
  • $$ CO_2 $$
The number and type of bonds in $$ C^{2-}_2 $$ in $$ CaC_2 $$ are:
  • Two $$ \sigma $$ bond and one $$ \pi $$ bond
  • Two $$ \sigma $$ bond and two $$ \pi $$ bond
  • One $$ \sigma $$ bond and two $$ \pi $$ bond
  • One $$ \sigma $$ bond and one $$ \pi $$ bond
The types of bonds present in $$ NH_4Cl $$ are:
  • electrovalent, covalent and coordinate
  • only ionic
  • only covalent
  • covalent and coordinate
The type of bond present in $$ CuSO_4 .5H_2O $$ are only.
  • Electrovalent and covalent
  • Electrovalent and coordinate covalent
  • Electrovalent,covalent and coordinate covalent
  • Covalent and coordinate covalent
On hybridization of one s-and one p-orbitals, we get:
  • Two mutually perpendicular orbitals
  • Two orbitals at $$ 180^o $$
  • four orbitals directed tetrahedrally
  • Three orbitals in the plane
The hybrid state and oxidation state of two oxygen atoms in $$H_2O_2$$ are respectively:
  • $$sp^2, -1$$
  • $$sp^2, +1$$
  • $$sp^3, -1$$
  • $$sp^3, +1$$
The hybridization of I in ICl$$_2^+$$ is :
  • $$sp$$
  • $$ sp^2 $$
  • $$ sp^3 $$
  • $$ dsp^2 $$
The hybridisation of oxygen atom in $$H_2O_2$$ is:
  • $$sp^3d$$
  • $$sp$$
  • $$sp^2$$
  • $$sp^3$$
  • $$sp^3d^2$$
Which statement(s) is are correct?
  • A sigma bond is stronger than $$ \pi-bond $$
  • A sigma bond is weaker than $$ \pi - bond $$
  • Hydrogen bonding is weaker than covalent bonding
  • A triple is weaker than double bond
In which of the following the central atom has maximum number of lone piar of electrons?
  • $$ SF_4 $$
  • $$ XeF_4 $$
  • $$ ClO_3^- $$
  • $$ I_3^- $$
Which of the following statements is true about $$[Cu(NH_3)_4] SO_4 $$? 
  • It has coordinate as well as covalent bonds
  • It has only coordinate bonds
  • It has only electrovalent bonds
  • It has electrovalent,covalent as well as coordinate bonds
Which of the following does not have $$S-S$$ linkage?
  • $$S_{2}O_{8}^{2-}$$
  • $$S_{2}O_{6}^{2-}$$
  • $$S_{2}O_{5}^{2-}$$
  • $$S_{2}O_{3}^{2-}$$
The correct order of $$O-O$$ bond length in $$O_{2}, H_{2}O_{2}$$ and $$O_{3}$$ is:
  • $$O_{3}>H_{2}O_{2}>O_{2}$$
  • $$O_{2}>H_{2}O_{2}>O_{3}$$
  • $$O_{2}>O_{3}>H_{2}O_{2}$$
  • $$H_{2}O_{2}>O_{3}>O_{2}$$
Which of the following has the highest value of dipole moment?
  • HCl
  • HF
  • HI
  • HBr
In $$OF_{2}$$ molecule, the total number of bond pairs and line pairs of electron present respectively are:
  • $$2,6$$
  • $$2,8$$
  • $$2,10$$
  • $$2,9$$
In which of the following $$S-S$$ link is present?
  • Caro's acid
  • Dithionic acid
  • Thiosulphuric acid
  • Chlorosulphonic acid
Number of lone pairs of electrons on Xe atoms in $$XeF_2, XeF_4$$ and $$XeF_6$$ moleculaes are respectively :
  • 3, 2 and 1
  • 4, 3 and 2
  • 2, 3 and 1
  • 3, 2 and 0
How many $$P-O$$ bonds and how many lone pairs respectively are present in $$P_4O_6$$ molecule?
  • $$12, 4$$
  • $$8, 8$$
  • $$12, 16$$
  • $$12, 12$$
The number of sigma and pi bonds in peroxydisulphuric acid are respectively:
  • $$9$$ and $$4$$
  • $$11$$ and $$4$$
  • $$4$$ and $$8$$
  • $$4$$ and $$9$$
Which of the following bonds is the weakest?
  • $$Si-Si$$
  • $$Si-O$$
  • $$Si-Cl$$
  • $$Si-H$$
The number of lone pairs and the number of $$S-S$$ bonds in $$S_{8}$$ molecules are respectively:
  • $$8,8$$
  • $$16,8$$
  • $$8,16$$
  • $$8,4$$
In which of the following ions, there is no $$S-S$$ bond?
  • $$S_{2}O_{4}^{2-}$$
  • $$S_{2}O_{6}^{2-}$$
  • $$S_{2}O_{2}^{2-}$$
  • $$S_{2}O_{3}^{2-}$$
  • $$S_{2}O_{7}^{2-}$$
Which of the following molecules of possess a permanent dipole moment?
  • $$H_{2}S$$
  • $$SO_{2}$$
  • $$NH_{3}$$
  • $$CS_{2}$$
In $$Fe(CO)_5$$, the $$Fe-C$$ bond posses:
  • $$\pi$$ character only
  • $$\sigma$$ character only
  • ionic character only
  • bond $$\pi$$ and $$\sigma$$ characters
Which of the following ions does not have S-S linkage?
  • $$ S_{2}O_{8}^{2-}$$
  • $$ S_{2}O_{6}^{2-}$$
  • $$ S_{2}O_{5}^{2-}$$
  • $$ S_{2}O_{3}^{2-}$$
$$M-L$$ bonds in carbonyl possess:
  • only sigma character
  • only pi $$(\pi)$$ character
  • both sigma $$(\sigma)$$ and pi $$(\pi)$$ characters
  • none of the above
The cation containing maximum number of unpaired electrons is:
  • $$Co^{2+}$$
  • $$Ni`^{2+}$$
  • $$Fe^{3+}$$
  • $$Fe^{2+}$$
B.P of $$H_2O (100^{\circ}C)$$ and $$H_2S (-42^{\circ}C)$$ explained by:
  • Vander Waal's forces
  • Covalent bond
  • Hydrogen bond
  • Ionic bond
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