Chemistry
Chemical Bonding & Molecular Structure
Previous Years Questions

## Numerical

Consider the following compounds in the liquid form :O2, HF, H2O, NH3, H2O2, CCl4, CHCl3, C6H6, C6H5ClWhen a charged comb is brought near their flowin...
The structure of a peptide is given below. If the absolute values of the net charge of the peptide at pH = 2, pH = 6, and pH = 11 are and |Z3|, respec...
Among $${H_2},H{e_2}^ + ,L{i_2},$$ $$B{e_2},{B_2},{C_2},{N_2},O_2^ -$$ and $${F_2},$$ the number of diamagnetic species is (Atomic numbers : $$H = ... Among the triatomic molecules/ions, BeCl2,$$N_3^-$$, N2O,$$NO_2^+$$, O3, SCl2,$$ICl_2^-$$,$$I_3^-$$and XeF2, the total number of linear molecule(... A list of species having the formula XZ4 is given below. XeF4, SF4 ,SiF4,$$BF_4^-$$,$$BrF_4^-$$, [Cu(NH)3]2+, [FeCl4]2-, [CoCl4]2- and [PtCl4]2- Def... Based on VSEPR theory, the number of 90 degree F-Br-F angles in BrF5 is There are ______$$\pi$$bonds in a nitrogen molecule. ## MCQ (More than One Correct Answer) With respect to hypochlorite, chlorate and perchlorate ions, choose the correct statement(s). Each of the following options contains a set of four molecules. Identify the option(s) where all four molecules posses permanent dipole moment at room... Among the following, the correct statement(s) is (are) According to Molecular Orbital Theory, which of the following statements is(are) correct? The compound(s) with TWO lone pairs of electrons on the central atom is(are) When O2 is adsorbed on a metallic surface, electron transfer occurs from the metal to O2. The true statement(s) regarding this adsorption is(are)... Hydrogen bonding plays a central role in the following phenomena Which of the following have identical bond order? The molecules that will have dipole moment are The linear structure is assumed by CO2 is isostructural with ## MCQ (Single Correct Answer) The geometries of the ammonia complexes of Ni2+, Pt2+ and Zn2+, respectively, are Assuming 2s – 2p mixing is NOT operative, the paramagnetic species among the following is Match the orbital overlap figures shown in List I with the description given in List II and select the correct answer using the code given below the l... The shape of XeO2F2 molecule is Geometrical shapes of the complexes formed by the reaction of Ni2+ with Cl-, CN- and H2O respectively are Assuming that Hund’s rule is violated, the bond order and magnetic nature of the diatomic molecule B2 is The species having pyramidal shape is Match each of the diatomic molecules in Column I with its property/properties in Column II: .tg {border-collapse:collapse;border-spacing:0;} .tg td{... The species having bond order different from that in CO is Among the following the paramagnetic compound is Which species has the maximum number of lone pair of electrons on the central atom? According to molecular orbital theory which of the following statement about the magnetic character and bond order is correct regarding$$O_2^+$$Which of the following are isoelectronic and isostructural?$$NO_3^-$$,$$CO_3^{2-}$$,$$ClO_3^-$$, SO3 Specify the coordination geometry around and hybridisation of N and B atoms in a 1 : 1 complex of BF3 and NH3 Identify the least stable ion amongst the following Which of the following molecular species has unpaired electrons(s)? The common features among the species CN-, CO and NO+ are Molecular shape of SF4, CF4 and XeF4 are The hybridisation of atomic orbitals of nitrogen in$$NO_2^+$$,$$NO_3^-$$and$$NH_4^+$$are The correct order of increasing C - O bond length of CO,$$CO_3^{2-}$$, CO2 is The geometry of H2S and its dipole moment are The geometry and the type of hybrid orbital present about the central atom in BF3 is Read the following Assertion and Reason and answer as per the options given below Assetion: LiCl is predominantly a covalent compound Reason : Electr... The critical temperature of water is higher than that of O2 because the H2O molecule has Which contains both polar and non-polar bonds? Which one of the following compounds has sp2 hybridization? The number and type of bonds between two carbon atoms in CaC2 are: Among the following species, identity the isostructural pairs NF3,$$NO_3^-$$, BF3, H3O+ , HN3 Which one is most ionic Number of paired electrons in O2 molecules is Pick out the isoelectronic structures from the following I.$$CH_3^+$$II.$$H_3O^+$$III.$$NH_3$$IV.$$CH_3^-$$The maximum number of hydrogen bonds a water molecule can form is The cyanide ion, CN- and N2 are isoelectronic, But in contrast to CN-, N2 is chemically inert, because of The type of hybrid orbitals used by the chlorine atom in$$ClO_2^-$$is The molecule which has zero dipole moment is: The molecule which has pyramidal shape is The compound in which$$\mathop C\limits^* $$uses its sp3 hybrid orbitals for bond formation is Which of the following is paramagnetic? The molecule that has linear structure is The species in which the central atom uses sp2 hybrid orbitals in its bonding is Hydrogen bond is maximum in The bond between two identical non-metal atoms has a pair of electrons The hydrogen bond is strongest in The hybridisation of sulphur in sulphur dioxide is The molecule having one unpaired electron is On hybridization of one s and one p orbitals we get: Carbon tetrachloride has no net dipole moment because of Which one among the following does not have the hydrogen bond? The types of bonds present in CuSO4.5H2O are only The ion that is isoelectronic with CO is Among the following, the molecule that is linear is The compound with no dipole moment is If a molecule MX3 has zero dipole moment, the sigma bonding orbitals used by M (atomic number < 21) are Element X is strongly electropositive and element Y is strongly electronegative. Both are univalent. The compound formed would be Which of the following compounds are covalent? The total number of electrons that take part in forming the bond in N2 is Which of the following is soluble in water? The compound which contains both ionic and covalent bonds is The octet rule is not valid for the molecule ## Subjective Arrange the following : In the decreasing order of the O - O bond length present in them O2, KO2 and O2[AsF4]... Draw the structure of XeF4 and OSF4 according to VSEPR theory clearly indicating the state of hybridisation of the central atom and lone pair of elect... Using VSEPR Theory draw the shape of PCl5 and BrF5 Write down the M.O. electron distribution of O2. Specify its bond order and magnetic property. Interpret the non-linear shape of H2S molecule and non-planar shape of PCl3 using valence shell electron pair repulsion (VSEPR) theory. (Atomic number... A compound of vanadium has a magnetic moment of 1.73 BM. Work out the electronic configuration of the vanadium ion in the compound. Using the VSEPR theory, identify the type of hybridization and draw the structure of OF2. What are the oxidation states of O and F? The dipole moment of KCl is 3.336$$\times$$10-29 Coulomb meters which indicates that it is a highly polar molecule. The interatomic distance between... Arrange the following : Increasing strength of hydrogen bonding (X-H-X): O, S, F, Cl, N Arrange the following : N2, O2, F2, Cl2 in increasing order of bond dissociation energy Write the lewis dot structure of the following: O3, COCl2 How many sigma bonds and how many pi-bonds are present in a benzene molecule? ## Fill in the Blanks When N2, the N-N bond distance _____ and when O2 goes to$$O_2^+ the O-O bond distance ___.
The two types of bond present in B2H6 are covalent and _______.
The shape of [CH3]+ is _____.
____ hybrid orbitals of nitrogen atom are involved in the formation of ammonium ion.
The angle between two convalent bonds is maximum in ________. (CH4, H2O, CO2)

## True or False

The dipole moment of CH3F is greater than of CH3Cl
The presence of polar bonds in a poly-atomic molecule suggests that the molecule has non-zero dipole moment.
sp2 hybrid orbitals have equal s and p character.
In benzene, carbon uses all the three p-orbitals for hybridisation.
All molecules with polar bonds have dipole moment.
SnCl2 is a non-linear molecule
Linear overlap of two atomic p-orbitals leads to a sigma bond.
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