JEE Main PYQs — Chemical Bonding

A molecule with the formula AX4Y has all its elements from p-block. Element A is rarest, monoatomic, non-radioactive from its group and has the lowest ionization enthalpy value among A, X and Y.…

Among SO2, NF3, NH3, XeF2, ClF3 and SF4, the hybridization of the molecule with non-zero dipole moment and highest number of lone pairs of electrons on the central atom is:

Which among the following molecules is (a) involved in sp3d hybridization, (b) has different bond lengths and (c) has lone pair of electrons on the central atom?

Consider 'n' is the number of lone pair of electrons present in the equatorial position of the most stable structure of ClF3. The ions from the following with 'n' number of unpaired electrons are:…

The molecules having square pyramidal geometry are:

Match the LIST-I with LIST-II. | LIST-I (Molecule/ion) | LIST-II (Bond pair : lone pair on central atom) | |---|---| | A. ICl2- | I. 4 : 2 | | B. H2O | II. 4 : 1 | | C. SO2 | III. 2 : 3 | | D. XeF4 |…

Given below are two statements: Statement I: H2Se is more acidic than H2Te. Statement II: H2Se has higher bond enthalpy for dissociation than H2Te. In the light of the above statements, choose the…

In which one of the following pairs do the central atoms exhibit sp2 hybridization?

The shape of carbocation is:

Which of the following is least ionic?

Number of molecules/ions from the following in which the central atom is involved in sp3 hybridization is {NO_3^-,\ BCl_3,\ ClO_2^-,\ ClO_3^-}

The incorrect statement regarding ethyne is

Which one of the following molecules has maximum dipole moment?

Choose the polar molecule from the following:

Arrange the bonds in order of increasing ionic character in the molecules: LiF, K2O, N2, SO2 and ClF3

The number of species from the following that have pyramidal geometry around the central atom is ____ {S_2O_3^{2-},\ SO_4^{2-},\ SO_3^{2-},\ S_2O_7^{2-}}

The correct statement(s) about Hydrogen bonding is/are: A. Hydrogen bonding exists when H is covalently bonded to a highly electronegative atom. B. Intermolecular H bonding is present in…

The correct increasing order for bond angles among BF3, PF3 and ClF3 is:

Given below are two statements: Statement I: N(CH3)3 and P(CH3)3 can act as ligands to form transition metal complexes. Statement II: As N and P are from the same group, the nature of bonding of…

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…

When A and B are the wave functions of atomic orbitals, then is represented by:

Given below are two statements: Statement I: A π bonding MO has lower electron density above and below the inter-nuclear axis. Statement II: The π antibonding MO has a node between the nuclei. Choose…

Given below are two statements: Statement I: Since fluorine is more electronegative than nitrogen, the net dipole moment of NF3 is greater than NH3. Statement II: In NH3, the orbital dipole due to…

Given below are two statements — Assertion (A) and Reason (R): Assertion (A): NH3 and NF3 molecules have pyramidal shape with a lone pair on nitrogen. The resultant dipole moment of NH3 is greater…

Given below are two statements — Assertion (A) and Reason (R): Assertion (A): PH3 has lower boiling point than NH3. Reason (R): In liquid state, NH3 molecules are associated through hydrogen bonding,…

Given below are two statements — Assertion A and Reason R: Assertion A: H2Te is more acidic than H2S. Reason R: Bond dissociation enthalpy of H2Te is lower than H2S. Choose the most appropriate…

Select the compound from the following that will show intramolecular hydrogen bonding:

Given below are two statements: Statement I: SO2 and H2O both possess V-shaped structure. Statement II: The bond angle of SO2 is less than that of H2O. Choose the most appropriate answer:

According to MO theory the bond orders for O22-, CO and NO+ respectively, are

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…

Decreasing order of the hydrogen bonding in following forms of water is correctly represented by: A. Liquid water B. Ice C. Impure water

ClF5 at room temperature is a

For OF2 molecule consider the following: (A) Number of lone pairs on oxygen is 2. (B) FOF angle is less than 104.5°. (C) Oxidation state of O is −2. (D) Molecule is bent 'V' shaped. (E) Molecular…

Consider the following statements: (A) NF3 molecule has a trigonal planar structure. (B) Bond length of N2 is shorter than O2. (C) Isoelectronic molecules or ions have identical bond order. (D)…

In which of the following processes does the bond order increase and paramagnetic character change to diamagnetic?

The bond dissociation energy is highest for

What is the number of unpaired electrons in the highest occupied molecular orbital of the following species: N2, N2+, O2, O2+?

Order of covalent bond — which of the following are correct? A. KF > KI; LiF > KF B. KF < KI; LiF > KF C. SnCl4 > SnCl2; CuCl > NaCl D. LiF > KF; CuCl > NaCl E. KF < KI; CuCl > NaCl

The pair from the following pairs having both compounds with net non-zero dipole moment is

Given below are two statements: Statement I: SbCl5 is more covalent than SbCl3. Statement II: The higher oxides of halogens also tend to be more stable than the lower ones. Choose the most…

Which one of the following pairs is an example of polar molecular solids?

Given below are two statements — Assertion A and Reason R: Assertion A: Butan-1-ol has higher boiling point than ethoxyethane. Reason R: Extensive hydrogen bonding leads to stronger association of…

The bond order and magnetic property of acetylide ion (C22-) are same as that of

The increasing order of boiling points of the following compounds is: I. 4-methylphenol (p-cresol) II. 4-nitrophenol III. 4-aminophenol IV. 4-methoxyphenol

The bond order and magnetic property of acetylide ion are same as that of

Identify the correct order of standard enthalpy of formation of sodium halides.

Which of the following pair of molecules contain an odd electron molecule and an expanded octet molecule?

Number of electron deficient molecules among the following PH3,\ B2H6,\ CCl4,\ NH3, LiH and BCl3 is

Number of lone pair(s) of electrons on central atom and the shape of BrF3 molecule respectively, are:

Arrange the following in the decreasing order of covalent character: (A) LiCl (B) NaCl (C) KCl (D) CsCl

In the structure of SF4, the lone pair of electrons on S is in:

Identify the incorrect statement for PCl5 from the following:

Consider the species CH4, NH4+ and BH4-. Choose the correct option with respect to these species:

The oxide which contains an odd electron at the nitrogen atom is

Number of lone pairs of electrons in the central atom of SCl2, O3, ClF3 and SF6, respectively, are

The correct order of bond orders of C22-, N22- and O22- is

Bonding in which of the following diatomic molecules becomes stronger by removal of an electron? (A) NO (B) N2 (C) O2 (D) C2 (E) B2

Consider the ions/molecule O2+, O2, O2-, O22-. For increasing bond order the correct option is

Arrange the following in increasing order of covalent character: (A) CaF2 (B) CaCl2 (C) CaBr2 (D) CaI2

The correct order of increasing intermolecular hydrogen bond strength is

Given below are two statements — Assertion A and Reason R: Assertion A: Zero orbital overlap is an out-of-phase overlap. Reason R: It results due to different orientation/direction of approach of…

Given below are two statements: Statement I: O2, Cu2+ and Fe3+ are weakly attracted by magnetic field and are magnetized in the same direction as the magnetic field. Statement II: NaCl and H2O are…

The hybridisations of the atomic orbitals of nitrogen in NO2-, NO2+ and NH4+ respectively are:

Amongst the following, the linear species is:

The bond order and magnetic behaviour of O2- ion are, respectively:

Identify the species having one π-bond and maximum number of canonical forms from the following:

Which of the following are isostructural pairs? A. SO42- and CrO42- B. SiCl4 and TiCl4 C. NH3 and NO3- D. BCl3 and BrCl3

Given below are two statements: Assertion A: The H–O–H bond angle in water molecule is 104.5°. Reason R: The lone pair–lone pair repulsion of electrons is higher than the bond pair–bond pair…

Which among the following species has unequal bond lengths?

A central atom in a molecule has two lone pairs of electrons and forms three single bonds. The shape of this molecule is

The correct shape and I–I–I bond angles respectively in I3- ion are:

According to molecular orbital theory, the species among the following that does not exist is:

Which one of the following species doesn't have a magnetic moment of 1.73 BM (spin only value)?

In the following, the correct bond order sequence is:

Number of paramagnetic oxides among the following is ____ {Li_2O,\ CaO,\ Na_2O_2,\ KO_2,\ MgO,\ K_2O}

The correct set from the following in which both pairs are in correct order of melting point is:

The interaction energy of London forces between two particles is proportional to rx, where r is the distance between the particles. The value of x is:

Given below are two statements — Assertion A and Reason R: Assertion A: Dipole–dipole interactions are the only non-covalent interactions resulting in hydrogen bond formation. Reason R: Fluorine is…

The compound(s) which will show significant intermolecular H-bonding is/are: (a) o-nitrophenol (b) 4-acetamidophenol (paracetamol) (c) 2,4,6-trimethylphenol

Given below are two statements — Assertion A and Reason R: Assertion A: In TlI3, isomorphous to CsI3, the metal is present in +1 oxidation state. Reason R: Tl metal has fourteen f electrons in its…

Given below are two statements: Statement I: o-Nitrophenol is steam volatile due to intramolecular hydrogen bonding. Statement II: o-Nitrophenol has high melting point due to hydrogen bonding. Choose…

Given below are two statements — Assertion A and Reason R: Assertion A: Lithium halides are somewhat covalent in nature. Reason R: Lithium possesses high polarisation capability. Choose the most…

Given below are two statements — Assertion A and Reason R: Assertion A: Lithium halides are somewhat covalent in nature. Reason R: Lithium possesses high polarisation capability. Choose the most…

Statement I: Sodium hydride can be used as an oxidising agent. Statement II: The lone pair of electrons on nitrogen in pyridine makes it basic. Choose the CORRECT answer:

The shape/structure of [XeF5]- and XeO3F2, respectively are:

The molecular geometry of SF6 is octahedral. What is the geometry of SF4 (including lone pair(s) of electrons, if any)?

If AB4 molecule is a polar molecule, a possible geometry of AB4 is:

The compound that has the largest H–M–H bond angle (M = N, O, S, C) is:

Arrange the following bonds according to their average bond energies in descending order: C–Cl, C–Br, C–F, C–I

Of the species NO, NO+, NO2+ and NO-, the one with minimum bond strength is:

If the magnetic moment of a di-oxygen species is 1.73 BM, it may be

The bond order and the magnetic characteristic of CN- are

The dipole moments of CCl4, CHCl3 and CH4 are in the order

The predominant intermolecular forces present in ethyl acetate, a liquid, are:

The relative strength of the interionic/intermolecular forces in decreasing order is:

If the boiling point of H2O is 373 K, the boiling point of H2S will be:

Among the compounds A and B with molecular formula C9H18O3, A has a higher boiling point than B. The possible structures of A and B are: (1) A = 1,3,5-trimethoxycyclohexane; B =…

Consider the following molecules and statements: (A) 2-hydroxybenzoic acid (salicylic acid) (B) 4-hydroxybenzoic acid (para-hydroxybenzoic acid) (a) (B) is more likely to be crystalline than (A) (b)…

The reaction in which the hybridisation of the underlined atom is affected is

The molecule in which hybrid MOs involve only one d-orbital of the central atom is:

The element that shows greater ability to form p-p multiple bonds is:

The type of hybridization and number of lone pair(s) of electrons of Xe in XeOF4, respectively, are:

Among the following, the molecule expected to be stabilized by anion formation is: C2, O2, NO, F2

In which of the following processes has the bond order increased and paramagnetic character changed to diamagnetic?

According to molecular orbital theory, which of the following is true with respect to Li2+ and Li2-?

Among the following molecules/ions C22-, N22-, O22-, O2, which one is diamagnetic and has the shortest bond length?

Among the following species, the diamagnetic molecule is:

During the change of O2 to O2-, the incoming electron goes to the orbital:

Two pi and half sigma bonds are present in:

The correct statement among the following is:

The correct statement among the following is: