CBSE Class 11 Chemical Bonding and Molecular Structure — practice questions
73 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice CBSE Class 11 Chemical Bonding and Molecular Structure in the app →According to VSEPR theory, the shape of a molecule is determined byThe hybridisation of carbon in methane (CH₄) isWhich molecule is non-polar despite having polar bonds?The bond order of the oxygen molecule O₂ (by molecular orbital theory) isA coordinate (dative) bond differs from a normal covalent bond in thatWhich species has sp hybridisation on the central atom?As bond order increases, bond lengthAn ionic bond forms byThe shape of NH₃ is pyramidal rather than planar becauseWhich has the highest dipole moment?Among the following, which is paramagnetic?Formal charge on an atom = Per NCERT §4.1, the KOSSEL-LEWIS approach (1916) explains chemical bonding in terms of which fundamental idea?Per NCERT §4.1.1, the OCTET RULE states which of the following?Per NCERT §4.1.5, which of the following is an example of an INCOMPLETE octet of the central atom?Per NCERT §4.1.5, which examples illustrate an EXPANDED octet (more than 8 e⁻ around central atom)?Per NCERT §4.1.5 (odd-electron molecules), which species violates the octet rule because of an ODD electron coPer NCERT §4.1.4, the FORMAL CHARGE on an atom in a Lewis structure is given by which formula?Per NCERT §4.1.4, formal charges on the central O atom + terminal O atoms in OZONE (O₃) Lewis structure are whPer NCERT §4.2, IONIC bonds form most readily between elements with which combination of properties?Per NCERT §4.2.1, the LATTICE ENTHALPY of an ionic solid is defined as which quantity?Per NCERT §4.2, for NaCl formation: IE(Na) = +496 kJ/mol, ΔₑgH(Cl) = −349 kJ/mol — these alone are positive (+Per NCERT §4.3.2, the H-O-H BOND ANGLE in water molecule is which value?Per NCERT §4.3.4 (bond order), which trio of N₂, CO, and NO⁺ have which property in common — and why?Per NCERT §4.4, the VSEPR theory (Sidgwick-Powell 1940; refined by Nyholm-Gillespie 1957) predicts molecular sPer NCERT §4.4, the order of repulsion between electron pairs in VSEPR is which?Per NCERT Table 4.6, what is the geometry of a molecule of type AB₅ with NO lone pairs on the central atom (e.Per NCERT Table 4.6, what is the geometry of a molecule of type AB₆ with NO lone pairs (e.g. SF₆)?Per NCERT Table 4.7, the shape of SF₄ (5 e⁻ pairs: 4 bp + 1 lp around S) is which?Per NCERT Table 4.7, the shape of XeF₄ (4 bp + 2 lp on Xe) is which?Per NCERT Table 4.8, the H-N-H bond angle in NH₃ is which value, and why is it less than the tetrahedral 109.5Per NCERT §4.3.6 (Debye conversion), 1 DEBYE equals how many C·m, and the unit honours which scientist?Per NCERT §4.3.6 + Table 4.5, why is the dipole moment of BF₃ ZERO although each B-F bond is polar?Per NCERT §4.3.6, why is dipole moment of NH₃ (1.47 D) MUCH GREATER than that of NF₃ (0.23 D) despite F being Per NCERT §4.3.5, the concept of RESONANCE is invoked when which condition holds?Per NCERT §4.3.5 (misconceptions), which statement about RESONANCE is INCORRECT?Per NCERT §4.5, Valence Bond (VB) theory was introduced by which scientists, in which year, and was later devePer NCERT §4.5.4, the SIGMA (σ) bond and PI (π) bond differ in which way?Per NCERT §4.5.5, which type of bond is generally STRONGER and why?Per NCERT §4.6.1, in sp HYBRIDISATION (e.g. BeCl₂ in excited state), each hybrid orbital has what s and p charPer NCERT §4.6.1, BCl₃ has its boron sp² hybridised. What is the molecular geometry + bond angle?Per NCERT §4.6.1, in sp³ hybridisation (e.g. CH₄), each hybrid has 25% s + 75% p character. What is the H-C-H Per NCERT §4.6.2 (ethyne C₂H₂), the C-C triple bond is composed of which bonds, and the carbon atoms are whichPer NCERT §4.6.2 (ethene C₂H₄), the C=C double bond consists of what, and each carbon's hybridisation is whichPer NCERT §4.6.3, PCl₅ uses what hybridisation, and gives what geometry?Per NCERT §4.6.3, SF₆ uses what hybridisation, and gives what geometry?Per NCERT §4.6.3, why are the AXIAL P-Cl bonds in PCl₅ slightly LONGER (and weaker) than the equatorial ones?Per NCERT §4.5.3 (orbital-overlap directional argument), why does simple overlap of unhybridised C atomic orbiPer NCERT §4.7, Molecular Orbital (MO) theory was proposed by which scientists, in which year?Per NCERT §4.7.1, when two atomic orbitals ψ_A and ψ_B combine by LCAO, what two molecular orbitals form, and Per NCERT §4.7.5, the BOND ORDER from MOT is defined as which expression?Per NCERT §4.7.4, the ORDER of MO energies that applies to O₂ and F₂ is which?Per NCERT §4.8 (He₂), why does He₂ molecule NOT exist as a stable species?Per NCERT §4.8 (O₂), the MOT prediction for OXYGEN MOLECULE explains which experimental observation that earliPer NCERT §4.8 (O₂), the MOT bond order of oxygen is computed as which?Per NCERT §4.8 (Li₂), the BOND ORDER and magnetic nature of Li₂ from MOT are which?Per NCERT §4.7.5 (general rule), how does BOND LENGTH relate to BOND ORDER in MOT?Per NCERT §4.9, a HYDROGEN BOND forms when a hydrogen atom is between which two atoms?Per NCERT §4.9.2, the two types of H-bonds are INTERMOLECULAR and INTRAMOLECULAR. Which example is INTRAMOLECUPer NCERT §4.9.1, the magnitude of hydrogen bonding depends on the physical state of the compound — and is MAXThe bonding in NaCl on the kitchen salt jar is best described as:The shape of the methane (CH$_4$) molecule is:The hybridisation of carbon in ethyne (HC$\equiv$CH) is:Water has a much higher boiling point than H$_2$S (similar molar mass) because:An IONIC bond is formed by:The bond in N2 (nitrogen molecule) is a:In the H3O+ ion, the bond between H+ and H2O is a:The geometry of CH4 (methane) as predicted by VSEPR is:The hybridisation of carbon in C2H4 (ethylene, with a C=C double bond) is:A SIGMA bond differs from a PI bond in that the sigma bond:Molecular Orbital Theory uniquely EXPLAINS why O2 is:The molecule CO2 has zero net DIPOLE MOMENT because:In BENZENE (C6H6), all six C-C bond lengths are equal (1.39 Å) because of: