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Chemistry
Chemical Bonding & Molecular Structure
Previous Years Questions

$$\mathrm{O}-\mathrm{O}$$ bond length in $$\mathrm{H}_{2} \mathrm{O}_{2}$$ is $$\underline{\mathrm{X}}$$ than the $$\mathrm{O}-\mathrm{O}$$ bond lengt...
Match List I with List II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family...
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. Oxi...
Match List I with List II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family...
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 ...
What is the number of unpaired electron(s) in the highest occupied molecular orbital of the following species : $$\mathrm{{N_2};N_2^ + ;{O_2};O_2^ + }... Decreasing order of the hydrogen bonding in following forms of water is correctly represented by A. Liquid water B. Ice C. Impure water Choose the cor... Order of Covalent bond;$$\mathrm{A.~KF > KI ; LiF > KF}\mathrm{B.~KF KF}\mathrm{C.~SnCl_4 > SnCl_2 ; CuCl > NaCl}\mathrm{D.~LiF > KF ...
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,...
Match List - I with List - II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-f...
Given below are two statements. Statement I: $$\mathrm{O}_{2}, \mathrm{Cu}^{2+}$$, and $$\mathrm{Fe}^{3+}$$ are weakly attracted by magnetic field and...
The total number of $$\mathrm{Mn}=\mathrm{O}$$ bonds in $$\mathrm{Mn}_{2} \mathrm{O}_{7}$$ is __________.
Arrange the following in increasing order of their covalent character. A. $$\mathrm{CaF}_{2}$$ B. $$\mathrm{CaCl}_{2}$$ C. $$\mathrm{CaBr}_{2}$$ D. $$... Match List-I with List-II : .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-fami... Match List I with List II: .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-famil... Consider the species CH4, NH$$_4^ + $$and BH$$_4^ - $$. Choose the correct option with respect to the these species. Number of lone pair(s) of electrons on central atom and the shape BrF3 molecule respectively, are In the structure of SF4, the lone pair of electrons on S is in. Identify the incorrect statement for PCl5 from the following. The correct order of increasing intermolecular hydrogen bond strength is Based upon VSEPR theory, match the shape (geometry) of the molecules in List-I with the molecules in List-II and select the most appropriate option. ... Consider the ions/molecule O$$_2^ + $$, O2, O$$_2^ - $$, O$$_2^ {2-} $$For increasing bond order the correct option is :... Bonding in which of the following diatomic molecule(s) become(s) stronger, on the basis of MO Theory, by removal of an electron? (A) NO (B) N2 (C) O2 ... Number of electron deficient molecules among the following PH3, B2H6, CCl4, NH3, LiH and BCl3 is... The correct order of bond orders of$${C_2}^{2 - }$$,$${N_2}^{2 - }$$and$${O_2}^{2 - }$$is, respectively Identify the correct statement for B2H6 from those given below : (A) In B2H6, all B-H bonds are equivalent. (B) In B2H6, there are four 3-centre-2-ele... Number of paramagnetic oxides among the following given oxides is ____________.Li2O, CaO, Na2O2, KO2, MgO and K2O... Match List - I with List - II :Choose the most appropriate answer from the options given below :... Match items of List-I with those of List-II : List - I(Property) List - II(Example) (a) Diamagnetism (i) ... The bond order and magnetic behaviour of$$O_2^ - $$ion are respectively : In the following the correct bond order sequence is : Identify the species having one$$\pi$$-bond and maximum number of canonical forms from the following : Match List-I with List-II : List-I(Species) List-II(Hybrid Orbitals) (a)$$S{F_4}$$(i)$$s{p^3}{d^2}$$... The hybridisations of the atomic orbitals of nitrogen in NO$$_2^ - $$, NO$$_2^ + $$and NH$$_4^ + $$respectively are. The set in which compounds have different nature is : The oxide that shows magnetic property is : Amongst the following, the linear species is : A central atom in a molecule has two lone pairs of electrons and forms three single bonds. The shape of this molecule is : Given below are two statements : one is labeled as Assertion A and the other is labelled as Reason R :Assertion A : The H$$-$$O$$-$$H bond angle in wa... Match List - I with List - II. List - I (Molecule) List - II (Bond order) (a)$$N{e_2}$$(i) 1 ... Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.Assertion A : Dipole-dipole interactions are the... Which among the following species has unequal bond lengths? According to molecular orbital theory, the species among the following that does not exist is : The correct set from the following in which both pairs are in correct order of melting point is : The correct shape and$$I - I - I$$bond angles respectively in$$I_3^ - $$ion are : Which of the following are isostructural pairs ? A.$$SO_4^{2 - }$$and$$CrO_4^{2 - }$$B. SiCl4, and TiCl4 C. NH3 and NO3- D. BCl3 and BrCl3 ... The compound that has the largest H–M–H bond angle (M = N, O, S, C) is : The structure of PCl5 in the solid state is : The potential energy curve for the H2 molecule as a function of internuclear distance is : The reaction in which the hybridisation of the underlined atom is affected is : The intermolecular potential energy for the molecules A, B, C and D given below suggests that : ... The incorrect statement is : Consider the following molecules and statements related to them : (a) (B) is more likely to be crystalline than (A) (b) (B) has higher boiling point ... Of the species, NO, NO+, NO2+ and NO- , the one with minimum bond strength is : Match the type of interaction in column A with the distance dependence of their interaction energy in column B .tg {border-collapse:collapse;border-... The molecular geometry of SF6 is octahedral. What is the geometry of SF4 (including lone pair(s) of electrons, if any)? The shape / structure of [XeF5]– and XeO3F2, respectively, are If AB4 molecule is a polar molecule, a possible geometry of AB4 is The number of sp2 hybrid orbitals in a molecule of benzene is : If the magnetic moment of a dioxygen species is 1.73 B.M, it may be : Arrange the following bonds according to their average bond energies in descending order : C–Cl, C–Br, C–F, C–I The number of bonds between sulphur and oxygen atoms in S2O82- and the number of bonds between sulphur and sulphur atoms in rhombic sulphur, respectiv... The bond order and the magnetic characteristics of CN- are : The relative strength of interionic/intermolecular forces in decreasing order is : The dipole of CCl4, CHCl3 and CH4 are in the order : The correct statement among the following is : During the change of O2 to O2- , the incoming electron goes to the orbital : The oxoacid of sulphur that does not contain bond between sulphur atoms is Among the following species, the diamagnetic molecule is The structures of beryllium chloride in the solid state and vapour, phase, respectively,are : The correct statements among I to III are : (I) Valence bond theory cannot explain the color exhibited by transition metal complexes. (II) Valence bon... HF has highest boiling point among hydrogen halides, because it has : Among the following, the molecule expected to be stabilized by anion formation is : C2, O2, NO, F2 The ion that has sp3d2 hybridization for the central atom, is : The covalent alkaline earth metal halide (X = Cl, Br, I) is : Among the following molecules / ions,$$C_2^{2 - },N_2^{2 - },O_2^{2 - },{O_2}$$which one is diamagnetic and has the shortest bond length? The correct statement about ICl5 and$$ICl_4^-$$is The element that shows greater ability to form p$$\pi $$-p$$\pi $$multiple bonds, is - The pair that contains two P – H bonds in each of the oxoacids is The number of 2-centre-2-electron and 3-centre -2-electron bonds in B2H6, respectively, are : Two pi and half sigma bonds are present in : The type of hybridisation and number of lone pair (s) of electrons of Xe in XeOF4, respectively, are: In which of the following process, the bond order has increased and paramagnetic character has charged to diamagnetic ? According to molecular orbital theory, which of the following is true with respect to Li2+ and Li2$$-$$? The incorrect geometry is represented by : Which of the following conversions involves change in both shape and hybridisation ? Total number of lone pair of electrons in$${\rm I}_3^ - $$ion is According to molecular orbital theory, which of the following will not be a viable molecule? Which of the following compounds contain(s) no covalent bond(s)? KCl, PH3, O2, B2H6, H2SO4 ... The number of P$$-$$O bonds in P4O6 is : Which of the following best describes the diagram below of a molecular orbital ? ... In the molecular orbital diagram for the molecular ion, N2+, the number of electrons in the$$\sigma $$2pz molecular orbital is : ... Identify the pair in which the geometry of the species is$$T$$-shape and square - pyraidal, respectively : The decreasing order of bond angles in BF3, NH3, PF3 and I3- is : In hydrogen azide (above) the bond orders of bond (I) and (II) are :... The group having triangular planar structures is : Which of the following is paramagnetic ? sp3d2 hybridization is not displayed by : Which of the following species is not paramagnetic? The bond angle H - X - H is the greatest in the compound : The group of molecules having identical shape is : The species in which the \mathrm{N} atom is in a state of s p hybridization is : The intermolecular interaction that is dependent on the inverse cube of distance between the molecule is: In which of the following pairs of molecules/ions, both the species are not likely to exist? Stability of the species Li2,$$Li_2^−$$and$$Li_2^+$$increases in the order of: Ortho–Nitrophenol is less soluble in water than p– and m– Nitrophenols because : In which of the following pairs the two species are not isostructural ? Among the following the maximum covalent character is shown by the compound : The hybridization of orbitals of N atom in$$NO_3^-$$,$$NO_2^+$$and$$NH_4^+$$are respectively : The structure of IF7 is : Using MO theory, predict which of the following species has the shortest bond length? The bond dissociation energy of B - F in BF3 is 646 jJ mol-1 whereas that of C - F in CF4 is 515 kj mol-1. The correct reason for higher B - F bond di... Which of the following pair of species have the same bond order? Which of the following species exhibits the diamagnetic behaviour? The charge/size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polariz... In which of the following ionization processes, the bond order has increased and the magnetic behaviour has changed? Which of the following hydrogen bonds is the strongest? Which of the following molecules/ions does not contain unpaired electrons? In which of the following molecules/ions are all the bonds not equal? The decreasing values of bond angles from NH3 (106o) to SbH3 (91o ) down group-15 of the periodic table is due to ... Lattice energy of an ionic compounds depends upon The correct order of bond angles (smallest first) in H2S, NH3, BF3 and SiH4 is The bond order in NO is 2.5 while that in NO+ is 3. Which of the following statements is true for these two species? The states of hybridization of boron and oxygen atoms in boric acid (H3BO3) are respectively Which one of the following has the regular tetrahedral structure? (Atomic nos : B = 5, S = 16, Ni = 28, Xe = 54) The maximum number of 90° angles between bond pair of electrons is observed in An ethar is more volatile than an alcohol having the same molecular formula. This is due to Which one of the following pairs of molecules will have permanent dipole moments for both members The pair of species having identical shapes for molecules of both species is Which one of the following compounds has the smallest bond angle in its molecule? In which of the following species the interatomic bond angle is 109o28' ? Hybridisation of underline atom changes in Which of the following are arranged in an increasing order of their bond strengths? In which of the following species is the underlined carbon having sp3 hybridisation? A square planar complex is formed by hybridisation of which atomic orbitals ? ## Numerical Amongst the following, the number of species having the linear shape is _________. \mathrm{XeF}_{2}, \mathrm{I}_{3}^{+}, \mathrm{C}_{3} \mathrm{O}_{... The number of molecules or ions from the following, which do not have odd number of electrons are _________. (A) NO$$_2$$(B) ICl$$_4^ - $$(C) BrF$$_...
How many of the following metal ions have similar value of spin only magnetic moment in gaseous state? ______________ (Given : Atomic number V, 23; Cr...
The total number of lone pairs of electrons on oxygen atoms of ozone is __________.
Consider, $$\mathrm{PF}_{5}, \mathrm{BrF}_{5}, \mathrm{PCl}_{3}, \mathrm{SF}_{6},\left[\mathrm{ICl}_{4}\right]^{-}, \mathrm{ClF}_{3}$$ and $$\mathrm{I... The number of paramagnetic species among the following is ___________.$$\mathrm{B}_{2}, \mathrm{Li}_{2}, \mathrm{C}_{2}, \mathrm{C}_{2}^{-}, \mathrm{...
The number of interhalogens from the following having square pyramidal structure is : $$\mathrm{ClF}_{3}, \mathrm{IF}_{7}, \mathrm{BrF}_{5}, \mathrm{B... The number of molecule(s) or ion(s) from the following having non-planar structure is ____________.$$\mathrm{NO}_{3}^{-}, \mathrm{H}_{2} \mathrm{O}_{...
Amongst the following, the number of oxide(s) which are paramagnetic in nature is $$\mathrm{Na}_{2} \mathrm{O}, \mathrm{KO}_{2}, \mathrm{NO}_{2}, \mat... According to MO theory, number of species/ions from the following having identical bond order is ________.$$\mathrm{CN}^{-}, \mathrm{NO}^{+}, \mathrm...
The spin-only magnetic moment value of the compound with strongest oxidizing ability among $$\mathrm{MnF}_{4}, \mathrm{MnF}_{3}$$ and $$\mathrm{MnF}_{... The sum of number of lone pairs of electrons present on the central atoms of XeO3, XeOF4 and XeF6, is ______________... Among the following species$$\mathrm{N}_{2}, \mathrm{~N}_{2}^{+}, \mathrm{N}_{2}^{-}, \mathrm{N}_{2}^{2-}, \mathrm{O}_{2}, \mathrm{O}_{2}^{+}, \mathr...
Amongst the following, the number of molecule/(s) having net resultant dipole moment is ____________. NF3, BF3, BeF2, CHCl3, H2S, SiF4, CCl4, PF5...
The hybridization of P exhibited in PF5 is spxdy. The value of y is __________.
Amongst SF4, XeF4, CF4 and H2O, the number of species with two lone pairs of electrons is _____________....
Amongst BeF2, BF3, H2O, NH3, CCl4 and HCl, the number of molecules with non-zero net dipole moment is ____________....
The spin-only magnetic moment value of $$B_2^ +$$ species is _____________ $$\times$$ 10$$-$$2 BM. (Nearest integer) [Given : $$\sqrt 3$$ = 1.73]...
According to molecular orbital theory, the number of unpaired electron(s) in $$O_2^{2 - }$$ is :
The number of hydrogen bonded water molecule(s) associated with stoichiometry CuSO4.5H2O is ____________.
The number of species having non-pyramidal shape among the following is ___________.(A) SO3(B) NO$$_3^ -$$(C) PCl3(D) CO$$_3^{2 - }$$...
AB3 is an interhalogen T-shaped molecule. The number of lone pairs of electrons on A is __________. (Integer answer)
The total number of electrons in all bonding molecular orbitals of $$O_2^{2 - }$$ is ______________.(Round off to the nearest integer)
The difference between bond orders of CO and NO$$^ \oplus$$ is $${x \over 2}$$ where x = _____________. (Round off to the Nearest Integer)
The number of lone pairs of electrons on the central I atom in I$$_3^ -$$ is ____________.
The number of species below that have two lone pairs of electrons in their central atom is _________. (Round off to the Nearest Integer).SF4, BF_4^ ...
AX is a covalent diatomic molecule where A and X are second row elements of periodic table. Based on Molecular orbital theory, the bond order of AX is...
Among the following, the number of halide(s) which is/are inert to hydrolysis is _________.(A) BF3(B) SiCl4(C) PCl5(D) SF6...
The number of Cl = O bonds in perchloric acid is, "________".
The sum of the total number of bonds between chromium and oxygen atoms in chromate and dichromate ions is ____________.
Chlorine reacts with hot and concentrated NaOH and produces compounds (X) and (Y). Compound (X) gives white precipitate with silver nitrate solution. ...

## MCQ (More than One Correct Answer)

Which one of the following molecules is expected to exhibit diamagnetic behaviour?
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