Chemical Bonding & Molecular Structure
The linear combination of atomic orbitals to form molecular orbitals takes place only when the combining atomic orbitals
A. have the same energy
B. have the minimum overlap
C. have same symmetry about the molecular axis
D. have different symmetry about the molecular axis
Choose the most appropriate from the options given below:
Given below are two statements:
Statement - I: Since Fluorine is more electronegative than nitrogen, the net dipole moment of $\mathrm{NF}_3$ is greater than $\mathrm{NH}_3$.
Statement - II: In $\mathrm{NH}_3$, the orbital dipole due to lone pair and the dipole moment of $\mathrm{NH}$ bonds are in opposite direction, but in $\mathrm{NF}_3$ the orbital dipole due to lone pair and dipole moments of N-F bonds are in same direction.
In the light of the above statements, choose the most appropriate from the options given below:
The molecule / ion with square pyramidal shape is
Aluminium chloride in acidified aqueous solution forms an ion having geometry
Match List I with List II.
| List I Molecule |
List II Shape |
||
|---|---|---|---|
| (A) | $\mathrm{BrF_5}$ | (I) | T-Shape |
| (B) | $\mathrm{H_2O}$ | (II) | See saw |
| (C) | $\mathrm{ClF_3}$ | (III) | Bent |
| (D) | $\mathrm{SF_4}$ | (IV) | Square pyramidal |
Choose the correct answer from the options given below :
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : There is a considerable increase in covalent radius from $\mathrm{N}$ to $\mathrm{P}$. However from As to Bi only a small increase in covalent radius is observed.
Reason (R) : Covalent and ionic radii in a particular oxidation state increases down the group. In the light of the above statements, choose the most appropriate answer from the options given below:
The difference in energy between the actual structure and the lowest energy resonance structure for the given compound is
Choose the polar molecule from the following:
(A) NF3 molecule has a trigonal planar structure.
(B) Bond length of $\mathrm{N}_{2}$ is shorter than $\mathrm{O}_{2}$.
(C) Isoelectronic molecules or ions have identical bond order.
(D) Dipole moment of $\mathrm{H}_{2}\mathrm{S}$ is higher than that of water molecule.
Choose the correct answer from the options given below:
Given below are two statements :
Statement I : $\mathrm{SO}_{2}$ and $\mathrm{H}_{2} \mathrm{O}$ both possess V-shaped structure.
Statement II : The bond angle of $\mathrm{SO}_{2}$ is less than that of $\mathrm{H}_{2} \mathrm{O}$.
In the light of the above statements, choose the most appropriate answer from the options given below:
In which of the following processes, the bond order increases and paramagnetic character changes to diamagnetic one ?
The bond order and magnetic property of acetylide ion are same as that of
Match List - I with List - II:
| List - I Species | List - II Geometry/Shape | ||
|---|---|---|---|
| A. | $\mathrm{H_3O^+}$ | I. | Tetrahedral |
| B. | Acetylide anion | II. | Linear |
| C. | $\mathrm{NH_4^+}$ | III. | Pyramidal |
| D. | $\mathrm{ClO_2^-}$ | IV. | Bent |
Choose the correct answer from the options given below:
The compound which does not exist is
Match List I with List II
| LIST I Oxide |
LIST II Type of bond |
||
|---|---|---|---|
| A. | $\mathrm{N_2O_4}$ | I. | 1 N = O bond |
| B. | $\mathrm{NO_2}$ | II. | 1 N $-$ O $-$ N bond |
| C. | $\mathrm{N_2O_5}$ | III. | 1 N $-$ N bond |
| D. | $\mathrm{N_2O}$ | IV. | 1 N=N / N $\equiv$ N bond |
Choose the correct answer from the options given below:
$\mathrm{O}-\mathrm{O}$ bond length in $\mathrm{H}_{2} \mathrm{O}_{2}$ is $\underline{\mathrm{X}}$ than the $\mathrm{O}-\mathrm{O}$ bond length in $\mathrm{F}_{2} \mathrm{O}_{2}$. The $\mathrm{O}-\mathrm{H}$ bond length in $\mathrm{H}_{2} \mathrm{O}_{2}$ is $\underline{Y}$ than that of the $\mathrm{O}-\mathrm{F}$ bond in $\mathrm{F}_{2} \mathrm{O}_{2}$.
Choose the correct option for $\underline{X}$ and $\underline{Y}$ from those given below :
Match List I with List II
| List I | List II | ||
|---|---|---|---|
| A. | $\mathrm{XeF_4}$ | I. | See-saw |
| B. | $\mathrm{SF_4}$ | II. | Square-planar |
| C. | $\mathrm{NH_{4}^{+}}$ | III. | Bent T-shaped |
| D. | $\mathrm{BrF_3}$ | IV. | Tetrahedral |
Choose the correct answer from the options given below :
For $\mathrm{OF}_{2}$ molecule consider the following :
A. Number of lone pairs on oxygen is 2 .
B. FOF angle is less than $104.5^{\circ}$.
C. Oxidation state of $\mathrm{O}$ is $-2$.
D. Molecule is bent '$\mathrm{V}$' shaped.
E. Molecular geometry is linear.
correct options are:
Match List I with List II
| List I (molecules/ions) |
List II (No. of lone pairs of e$^-$ on central atom) |
||
|---|---|---|---|
| A. | $\mathrm{IF_7}$ | I. | Three |
| B. | $\mathrm{ICl}$$_4^ - $ | II. | One |
| C. | $\mathrm{XeF_6}$ | III. | Two |
| D. | $\mathrm{XeF_2}$ | IV. | Zero |
Choose the correct answer from the options given below :
According to MO theory the bond orders for $\mathrm{O}$$_2^{2 - }$, $\mathrm{CO}$ and $\mathrm{NO^+}$ respectively, are
The magnetic behaviour of $\mathrm{Li_2O,Na_2O_2}$ and $\mathrm{KO_2}$, respectively, are :
The bond dissociation energy is highest for
Statement I : Dipole moment is a vector quantity and by convention it is depicted by a small arrow with tail on the negative centre and head pointing towards the positive centre.
Statement II : The crossed arrow of the dipole moment symbolizes the direction of the shift of charges in the molecules.
In the light of the above statements, choose the most appropriate answer from the options given below :
What is the number of unpaired electron(s) in the highest occupied molecular orbital of the following species : $\mathrm{{N_2};N_2^ + ;{O_2};O_2^ + }$ ?
Decreasing order of the hydrogen bonding in following forms of water is correctly represented by
A. Liquid water
B. Ice
C. Impure water
Choose the correct answer from the options given below :
Order of Covalent bond;
$\mathrm{A.~KF > KI ; LiF > KF}$
$\mathrm{B.~KF < KI ; LiF > KF}$
$\mathrm{C.~SnCl_4 > SnCl_2 ; CuCl > NaCl}$
$\mathrm{D.~LiF > KF ; CuCl < NaCl}$
$\mathrm{E.~KF < KI ; CuCl > NaCl}$
Choose the correct answer from the options given below :
Which of the following pair of molecules contain odd electron molecule and an expanded octet molecule?
Number of lone pairs of electrons in the central atom of $\mathrm{SCl}_{2}, \mathrm{O}_{3}, \mathrm{ClF}_{3}$ and $\mathrm{SF}_{6}$, respectively, are :
Match List - I with List - II.
| List - I | List - II | ||
|---|---|---|---|
| (A) | $\psi_{\mathrm{MO}}=\psi_{\mathrm{A}}-\psi_{\mathrm{B}}$ | (I) | Dipole moment |
| (B) | $\mu=Q \times r$ | (II) | Bonding molecular orbital |
| (C) | $\frac{\mathrm{N}_{\mathrm{b}}-\mathrm{N}_{\mathrm{a}}}{2}$ | (III) | Anti-bonding molecular orbital |
| (D) | $\psi_{\mathrm{MO}}=\psi_{\mathrm{A}}+\psi_{\mathrm{B}}$ | (IV) | Bond order |
Choose the correct answer from the options given below :
Given below are two statements.
Statement I: $\mathrm{O}_{2}, \mathrm{Cu}^{2+}$, and $\mathrm{Fe}^{3+}$ are weakly attracted by magnetic field and are magnetized in the same direction as magnetic field.
Statement II: $\mathrm{NaCl}$ and $\mathrm{H}_{2} \mathrm{O}$ are weakly magnetized in opposite direction to magnetic field.
In the light of the above statements, choose the most appropriate answer from the options given below.
Arrange the following in increasing order of their covalent character.
A. $\mathrm{CaF}_{2}$
B. $\mathrm{CaCl}_{2}$
C. $\mathrm{CaBr}_{2}$
D. $\mathrm{CaI}_{2}$
Choose the correct answer from the options given below.
Match List-I with List-II :
| List I (Compound) |
List II (Shape) |
||
|---|---|---|---|
| (A) | BrF$_5$ | (I) | bent |
| (B) | [CrF$_6$]$^{3 - }$ | (II) | square pyramidal |
| (C) | O$_3$ | (III) | trigonal bipyramidal |
| (D) | PCl$_5$ | (IV) | octahedral |
Choose the correct answer from the options given below :
Match List I with List II:
| List I (molecule) |
List II (hybridization ; shape) |
||
|---|---|---|---|
| (A) | XeO$_3$ | (I) | sp$^3$d ; linear |
| (B) | XeF$_2$ | (II) | sp$^3$ ; pyramidal |
| (C) | XeOF$_4$ | (III) | sp$^3$d$^3$ ; distorted octahedral |
| (D) | XeF$_6$ | (IV) | sp$^3$d$^2$ ; square pyramidal |
Choose the correct answer from the options given below:
Consider the species CH4, NH$_4^ + $ and BH$_4^ - $. Choose the correct option with respect to the these species.
Number of lone pair(s) of electrons on central atom and the shape BrF3 molecule respectively, are
In the structure of SF4, the lone pair of electrons on S is in.
Identify the incorrect statement for PCl5 from the following.
The correct order of increasing intermolecular hydrogen bond strength is :
Based upon VSEPR theory, match the shape (geometry) of the molecules in List-I with the molecules in List-II and select the most appropriate option.
| List - I (Shape) |
List - II (Molecules) |
||
|---|---|---|---|
| (A) | T-shaped | (I) | XeF$_4$ |
| (B) | Trigonal planar | (II) | SF$_4$ |
| (C) | Square planar | (III) | ClF$_3$ |
| (D) | See-saw | (IV) | BF$_3$ |
Consider the ions/molecule
O$_2^ + $, O2, O$_2^ - $, O$_2^ {2-} $
For increasing bond order the correct option is :
Bonding in which of the following diatomic molecule(s) become(s) stronger, on the basis of MO Theory, by removal of an electron?
(A) NO
(B) N2
(C) O2
(D) C2
(E) B2
Choose the most appropriate answer from the options given below :
Number of electron deficient molecules among the following
PH3, B2H6, CCl4, NH3, LiH and BCl3 is
The correct order of bond orders of ${C_2}^{2 - }$, ${N_2}^{2 - }$ and ${O_2}^{2 - }$
is, respectivelyLi2O, CaO, Na2O2, KO2, MgO and K2O
Choose the most appropriate answer from the options given below :
| List - I (Property) |
List - II (Example) |
||
|---|---|---|---|
| (a) | Diamagnetism | (i) | MnO |
| (b) | Ferrimagnetism | (ii) | ${O_2}$ |
| (c) | Paramagnetism | (iii) | NaCl |
| (d) | Antiferromagnetism | (iv) | $F{e_3}{O_4}$ |
Choose the most appropriate answer from the options given below :