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CBSE Questions for Class 11 Medical Chemistry Chemical Bonding And Molecular Structure Quiz 15 - MCQExams.com

VSEPR theory suggest a small departure from 109028 for NH3 molecule. The H-N-H bond angle has been found to be 1070 what kind of hybrid orbital will be occupied by the non -bonding pair of electron?
  • sp3
  • sp3.4
  • sp2.13
  • sp2
Which of the following has -O-O-  linkage ?
  • H2S2O6
  • H2S2O8
  • H2S2O3
  • H2S4O6
Which species has the maximum number of lone pair of electrons on the central atom ?
  • [ClO3]
  • XeF4
  • SF4
  • [I3]
Which of the following sets of molecule(s) is/are having a linear shape but different hybridization?
  • I3 and CO2
  • HgCl2 and ICl2
  • XeF2 and C2H2
  • XeF2 and OCl
In OF2 number of bond pairs and lone pairs of electrons are:
  • 2, 6
  • 2, 8
  • 2, 10
  • 1, 9
A diatomic molecule has a dipole moment of 1.2D if its bond distance is 1.0˚A. What fraction of an electronic charge 'e' (i.e. charge on an electron) exists on each atom?
  • 20% of e
  • 21% of e
  • 19% of e
  • 25% of e
Which of the following molecule/species is having minimum number of lone pair on its central atom?
  • BrF3
  • BrF4
  • XeF5+
  • I3
Which of the following statement is/are correct ?
  • All carbon to carbon bonds contains a sigma bond and one or more π-bonds
  • All carbon to carbon bonds are sigma bonds
  • All oxygen to hydrogen bonds are hydrogen bonds
  • All carbon to hydrogen bonds are sigma bonds
In NO3 ion, number of bond pairs and lone pairs of electrons on nitrogen atom are -
  • 2, 2
  • 3, 1
  • 1, 3
  • 4, 0
In OF2, the number of bond pairs and lone pairs of electrons is, respectively:
  • 2,6
  • 2,8
  • 2,10
  • 2,9
The formula charges on three oxygen atoms of ozone molecule are respectively:
  • +1, 0 , + 1
  • 0, 0 , 0
  • +1, 0 , -1
  • -1 , +1 , -1
 Covalency is favoured in the following cases: 
  • a smaller cation
  • a larger anion
  • large charges on cation and anion
  • a cation without noble gas configuration
CC bond length is maximum in:
  • diamond
  • graphite
  • naphthalene
  • fullerene
Identify the correct sequence of increasing number of π bonds in structures of the following molecules.
(i) H2S2O6
(ii) H2SO3
(iii) H2S2O5
  • I,II,III
  • II,III,I
  • II,I,III
  • I,III,II
The number of POP bonds in cyclic metaphosphoric acid is:
  • zero
  • two
  • three
  • four
Compound X is anhydride of sulphuric acid. The number of sigma bonds and π- bonds present in X are respectively:
  • 6 and 6.95
  • 5 and 5.95
  • 3 and 3
  • 4 and 5.92
The bond length of the species O2,O+2,and O2 are in the order of:
  • O+2>O2>O2
  • O+2>O2>O2
  • O2>O+2>O2
  • O2>O2>O+2
Which species has the maximum number of lone pairs of electrons on the central atom?
  • ClO3
  • XeO4
  • I3
  • SF4
The bond strength increase:
  • with increasing bond order
  • with increasing extent of overlapping of orbitals
  • with decreasing in bond length
  • from a single bond to triple bond
In which pair(s)  is/are the stronger bond found in the first species?
  • O2,O2
  • N2,N2+
  • NO+,NO
  • CO,O22+
Number of sigma bonds in P4O10 is:
  • 6
  • 7
  • 17
  • 16
In which case the bond length is minimum between carbon and nitrogen?
  • CH3NH2
  • C6H5CH=NOH
  • CH3CONH2
  • CH3CN
How many bonding electron pairs are there in white phosphorous?
  • 6
  • 12
  • 4
  • 8
The number of POP bonds in cyclic meta phosphoric acid is:
  • one
  • two
  • three
  • four
In benzene the total number of σ bonds is 
  • 3
  • 6
  • 9
  • 12
Which of the following statements are correct about CO23?
  • The hybridisation of central atom is sp3.
  • Its resonance structure has one CO single bond and two C=O double bonds.
  • The average formal charge on each oxygen atom is 0.67 units.
  • All CO bond lengths are equal.
The bond in K4[Fe(CN)6] are
  • all ionic
  • all covalent
  • ionic and covalent
  • ionic, covalent and co-ordinate covalent
Which of the following has no net dipole moment?
Number of bonds in benzene 
  • 6σ and 3π
  • 12σ and 3π
  • 3σ and 12π
  • 6σ and 6π
Number of σ bonds in 
1761345_597ad47c881842edbaf85a9bdaa90595.png
  • 6
  • 15
  • 10
  • 12
Which of the following statements is wrong?
  • Single NN bond is stronger than the single PP bond.
  • PH3 can act as a ligand in the formation of coordination compound with transition elements.
  • NO2 is paramagnetic in nature.
  • Covalency of nitrogen in N2O5 is four.
 In a compound the number of sigma and pi bonds respectively are :

1816217_7564c7d08dfc406b8560192340aea578.PNG
  • 19, 11
  • 19, 5
  • 13, 11
  • 7, 3
Which of the following compounds have the same no. of lone pairs with their central atom?

(I) XeF5     (II) BrF3     (III) XeF2    (IV) H3S+    (V) Triple Methylene 
  • IV and V
  • I and III
  • I and II
  • II, IV and V
Correct set of species with zero dipole moment is :
(i) CO2    (ii) COCl2  (iii)CH2Cl2 (iv) BCl3
  • (i) and (iv)
  • (ii) and (iv)
  • (iii) and (iv)
  • (i), (iii) and (iv)
Which of the following combination of orbitals does not form covalent bond (x-axis is inter nuclear axis) :
  • s+py
  • py+py
  • dyz+dyz
  • dxy+dxy
Covalency favoured in the following case :
  • smaller cation
  • larger anion
  • large charge on cation and anions
  • all of these
Consider the following compounds and select the incorrect statement from the following :
    NH3,PH3,H2S,SO2,SO3,BF3,PCl3,IF7,P4,H2
  • Six molecules out of given compound involves hybridisation
  • Three molecules are hypervalent compounds
  • Six molecules out of above compounds are non-planar in structure
  • Two molecules out of given compounds involves (dπpπ) bonding as well as also involves (pπpπ) bonding
The incorrect statement(s) regarding .CX3 species is :
  • If electronegativity of surrounding element X is less than 2.5, then central carbon atom used almost 33% s-character in their hybrid bonding orbitals.
  • If electronegativity of surrounding element X is greater than 2.5, then central carbon atom used almost 25% s-character in their hybrid bonding orbitals.
  • If X is F, then species should be polar and pyramidal
  • If X is H, then species should be polar and planar
Number of lone pairs present on central atom of I3 are:
  • 9
  • 1
  • 6
  • 3
0:0:1


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