CBSE Questions for Class 11 Medical Chemistry Chemical Bonding And Molecular Structure Quiz 3 - MCQExams.com

In which of the following pairs, indicated bond is of greater strength?
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  • I
  • II
  • Both are equal
  • None of the above
In which of the above compounds, the indicated bond is of greater strength?
118278_fa4a7de5c6b94c1eb1bb8c1cf0197b86.JPG
  • I
  • II
  • Both are equal
  • Cannot determine
The maximum covalency is equal to :
  • the number of unpaired p-electrons
  • the number of paired d-electrons
  • the number of unpaired s and p-electrons
  • total number of unpaired electron in ground state or in excited state
Which of the following molecules will not have a dipole moment?
  • $$CH_3Cl$$
  • trans $$CHCl = CHCl$$
  • $$CH_2Cl_2$$
  • $$CCl_2 = CH_2$$
The total number of lone-pair of electrons in melamine is:
128568.png
  • $$3$$ lone pairs from the triazine moeity
  • $$3$$ lone pairs from the $$-NH_2$$ moeity
  • $$6$$ lone pairs from all the $$N$$
  • None of these
S in $$\displaystyle SF_{6}$$ is ______________ hybridized.
  • $$\displaystyle sp^{3}d^{3}$$
  • $$\displaystyle sp^{3}d^{4}$$
  • $$\displaystyle sp^{3}d^{2}$$
  • None of these
The total spin of two electrons forming a covalent bond is :
  • 0
  • $$\pm 1/2$$
  • 1
  • $$\pm 3/2$$
Which of the following is/are covalent binary compound(s)?
  • $$BF_3$$
  • $$KBr$$
  • $$CaI_2$$
  • $$AlF_3$$
$$\displaystyle N_{2}$$ molecule contains ________ o and  _______ $$\displaystyle \pi-$$ bonds.
  • one , four
  • three , two
  • one , two
  • none
Which one would better represent bonding in the molecule $$HNO$$?
I : $$H - \ddot{N} = \ddot{O}:$$  and II : $$H - \ddot{O} = \underset{\cdot\cdot}{\ddot{N}}$$
  • $$ I > II $$
  • $$ II > I $$
  • $$ I = II $$
  • None of these
True structure is predicted by :
  • valence bond approach
  • Sidgwick approach
  • hybrid orbital formation
  • None of the above
The nitrogen atom has an atomic number $$7$$ and oxygen has an atomic number $$8$$
Calculate the total number of electrons in nitrate ion.
  • $$8$$
  • $$16$$
  • $$32$$
  • $$24$$
The formal charge on the O atoms in the ion $$[:\ddot{O} = N = \ddot{O}:]^+$$ is:
  • $$-2$$
  • $$-1$$
  • $$0$$
  • $$+1$$

Consider the above Lewis Dot structure:

The formal charges on $$S$$ and $$O$$ are respectively:
189898.png
  • $$0 , 0$$
  • $$+2 , 0$$
  • $$0 , -2$$
  • $$+1 , -1$$
Which of these molecules have non-bonding electron pairs on the central atom?
$$I : SF_4;\, \, \, \, \, II : ICl_3;\, \, \, \, \, III : SO_2$$
  • II only
  • I and II only
  • I and III only
  • I, II and III
Number of lone pairs around phosphorus in $$PCl_5, PCl_4^+$$  and  $${PCl_6}^-$$ are respectively
  • $$0, 1, 2$$
  • $$0, 0, 0$$
  • $$1, 2, 3$$
  • $$0, 2, 1$$
By the axial overlapping of two p-orbitals of the same energy, a strong sigma bond is formed.
  • True
  • False
  • Ambiguous
  • None of these
Number of bond pairs (X) and lone pairs (Y) around the central atom in the $${ I }_3^-$$ ion are
  • $$X-2, Y-2$$
  • $$X-2, Y-3$$
  • $$X-3, Y-2$$
  • $$X-4, Y-3$$
The maximum covalency is equal to the number of:
  • paired p-electrons
  • unpaired s-electrons
  • unpaired s-and p-electrons
  • s-and p-electrons in the valence shell
Which contains both polar and non-polar covalent bonds?
  • $$N{ H }_{ 4 }Cl$$
  • $$HCN$$
  • $${ H }_{ 2 }{ O }_{ 2 }$$
  • $$C{ H }_{ 4 }$$
Calculate the steric numbers for iodine in $$(IF_4^-)$$ and for bromine in $$(BrO_4^-)$$.
  • $$6$$ and $$4$$
  • $$5$$ and $$6$$
  • $$4$$ and $$6$$
  • $$3$$ and $$4$$
The number of lone pairs of electron on $$Xe$$ in $$XeO{F}_{4}$$ is:
  • $$1$$
  • $$2$$
  • $$3$$
  • $$4$$
The ratio of lone pair and bond pair electrons on central $$I$$ atom in $${I}_{3}^{-}$$:
  • $$1$$
  • $$1.5$$
  • $$0.6$$
  • $$0.5$$
Number of bond pair and lone pair of electrons in $${OF}_{2}$$ are:
  • $$2,6$$
  • $$2,8$$
  • $$2,10$$
  • $$1,9$$
In which, central atom has one lone pair of electron?
  • $${Cl}_{2}$$
  • $${NH}_{3}$$
  • $$P{Cl}_{3}$$
  • $$Xe{F}_{6}$$
Which statements are correct?
  • A pi bond is weaker than sigma bond
  • A sigma bond is weaker than pi bond
  • A double bond is stronger than single bond
  • A covalent bond is stronger than $$H$$-bond
In the cyanide ion the formal negative charge is on:
  • $$C$$
  • $$N$$
  • both $$C$$ and $$N$$
  • resonate between $$C$$ and $$N$$
Select the correct statements.
  • van der Waals' radii is always larger than the covalent radii
  • The bond length of a particular bond depends on the state of hybridization of the involved atoms
  • When %s - character increases, then bond length increases
  • All are incorrect
Select the correct statement about chemical bond.
  • It is attraction between atoms
  • It is caused by the electrostatic force of attraction
  • The strength of chemical bonds varies considerably
  • All of the above
What is the value of $$1D$$ in $$SI$$ units ?
  • $$3.336\, \times 10^{-30}\, cm$$
  • $$33.36\, \times\, 10^{-30}\, cm$$
  • $$333.6\, \times\, 10^{-30}\, cm$$
  • None of these
Which of the following statements is/are not correct?
  • $$\pi$$ - bond always exists with sigma -bond according to Valence Bond Theory
  • $$\pi$$ - bond can exist independently according to Valence Bond Theory
  • $$\sigma$$ - bond is weaker than pi-bond
  • $$\pi$$ - bond is less reactive than sigma-bond
Shape of the molecules is decided by:
  • $$\sigma$$-bond
  • $$\pi$$-bond
  • both $$\sigma$$ and $$\pi$$ bonds
  • neither $$\sigma$$ nor $$\pi$$ bond
In $$XeF_{2},\, XeF_{4}$$, and $$XeF_{6}$$, the number of lone pairs on $$Xe$$, is__________.
  • $$2, 3, 1$$
  • $$1, 2, 3$$
  • $$4, 1, 2$$
  • $$3, 2, 1$$
The correct order of a dipole moment is :
  • $$CH_4 < NF_3 < NH_3 < H_2O$$
  • $$NF < CH_4 < NH_3 < H_2O$$
  • $$NH_3 < NF_3 < CH_4 < H_2O$$
  • $$H_2O < NH_3 < NF_3 < CH_4$$
Select the correct order of dipole moment.
  • $$BF_3\, <\, H_2O\, <\, H_2S$$
  • $$H_2O\, >\, BF_3\, >\, H_2S$$
  • $$H_2S\, <\, H_2O\, <\, BF_3$$
  • $$BF_3\, <\, H_2S\, <\, H_2O$$
A lone pair of electrons in an atom implies :
  • a pair of valence electrons
  • a pair of electrons
  • a pair of electrons involved in bonding
  • a pair of electrons not involved in bonding
Which of the following species has the maximum number of lone pair of electrons on the central atom?
  • $${ClO_{3}}^{-}$$
  • $$XeF_{4}$$
  • $$SF_{4}$$
  • $${I_{3}}^{-}$$
Which of the following species has four lone pairs of electrons in its outer shell ?
  • $$I$$
  • $$O^-$$
  • $$Cl^-$$
  • $$He$$
Arrange the following types of interactions in order of increasing stability (covalent, van der Waals' force, hydrogen bonding).
  • Hydrogen bonding < covalent < van der Waals' force
  • Covalent < hydrogen bonding < van der Waals' force
  • Hydrogen < Van der Waals' force < covalent bonding
  • Van der Waals' force < hydrogen bonding < covalent
Which of the following phenomenon will occur when two atoms of same spin will react?
  • Bonding will not occur.
  • Orbital overlap will not occur.
  • Both (a) and (b)
  • None of these.
How many bonding pairs and lone pairs surround the central atom in the $${ I }_3^-$$ ion ?
  • $$2,  2$$
  • $$2, 3$$
  • $$3 ,2$$
  • $$4 ,3$$
For the type of interactions : (I) covalent bond, (II) van der Waals' forces, and (III) hydrogen bonding, which represents the correct order of increasing stability?
  • $$(I) < (III) < (II)$$
  • $$(II) < (III) < (I)$$
  • $$(III) < (II) < (I)$$
  • $$(II) < (I) < (III)$$
In $$OF_{2}$$, the number of bond pairs and lone pairs of electrons is, respectively :
  • $$2, 6$$
  • $$2, 8$$
  • $$2, 10$$
  • $$2, 9$$
State True or False.
Dipole moment is completely based on ionic nature of bond.
  • True
  • False
Which of the following compounds have the same no. of lone pairs with their central atom:
  • $$XeF_{5}^{-}$$
  • $$BrF_{3}$$
  • $$XeF_{2}$$
  • Triple methylene
The net dipole in the water molecules is the resultant of its bond dipoles.
  • True
  • False
Nodal planes of $$\pi$$-bonds (s) in $$CH_2\, =\, C\, =\, C\, =\, CH_2$$ are located in:
  • all are in molecular plane
  • perpendicular plane which contains $$C-  C$$ $$\sigma$$-bond
  • one in molecular plane and two in a plane perpendicular to molecular plane which contains $$C -C$$ $$\sigma$$-bonds
  • two in molecular plane and one in a plane perpendicular to molecular plane which bisects $$C-  C$$ $$\sigma$$-bonds at right angle
How many bonded electron pairs are present in $$IF_7$$ molecule?
  • $$6$$
  • $$7$$
  • $$5$$
  • $$8$$
Which is not characteristic of $$\pi$$-bond?
  • $$\pi$$ - bond is formed when a sigma bond already formed
  • $$\pi$$ - bond are formed from hybrid orbitals
  • $$\pi$$ - bond may be formed by the overlapping of p-orbitals
  • $$\pi$$ - bond results from lateral overlap of atomic orbitals
Consider the following molecules/ions:
(1) $$SF_4$$ (2) $$CF_4$$ (3) $$XeF_4$$ (4) $${BF_4}^-$$
Which pair doesnot contain lone pair of electrons around its central atom?
  • $$1$$ and $$2$$
  • $$2$$ and $$4$$
  • $$2$$ and $$3$$
  • $$1$$ and $$4$$
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