NEET UG Chemical Bonding and Molecular Structure — practice questions
67 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice NEET UG Chemical Bonding and Molecular Structure in the app →According to the octet rule, atoms achieve stability by attaining an outer shell configuration of:The number of valence electrons in the Lewis dot symbol of nitrogen is:In the Lewis structure of CO₃²⁻, the total number of valence electrons to be accounted for is:For the NH₄⁺ ion, the total valence electrons available for writing the Lewis structure is:In a Lewis structure, the formal charge on an atom is calculated as:
In this LewisWhich of the following compounds is an example of *incomplete* octet of the central atom?Expanded octets are possible from the third period onwards because:Which of the following statements about lattice enthalpy is correct?For the formation of NaCl(s) from Na(g) and Cl(g), the ionisation enthalpy of Na is +495.8, electron-gain enthWhich of the following is most likely to have the greatest covalent character (Fajans' rules)?Per Fajans' rules, which cation is the most polarising for cations of the same size and charge?Ionic bonds are formed most easily between elements with:Bond length is defined as the:Among H–H, F–F, Cl–Cl, Br–Br, I–I, the bond length is shortest for:With increase in bond order from single → double → triple, bond length and bond enthalpy respectively:The bond dissociation enthalpy of N₂ is approximately 946 kJ mol⁻¹ while that of O₂ is 498 kJ mol⁻¹. This is pThe average O–H bond enthalpy in water is calculated from the two stepwise dissociation values (502 and 427 kJExperimentally, both O–O bonds in ozone (O₃) are found to be of equal length (128 pm), intermediate between O–Which of the following statements about resonance is INCORRECT?The dipole moment of CO₂ is zero because:Despite F being more electronegative than H, μ(NH₃) > μ(NF₃) because:Among the following, which molecule has zero net dipole moment?One Debye unit (1 D) is equivalent to:According to VSEPR theory, the order of repulsion between electron pairs is:The shape of a molecule of type AB₄ (no lone pair on A), e.g., CH₄, is:The shape of SF₄ is:The shape of ClF₃ is:XeF₄ adopts which geometry?The HOH bond angle in water (≈ 104.5°) is *less* than the ideal tetrahedral angle of 109.5° because:
In the molecular The shape of NH₃ is trigonal pyramidal with a bond angle of about 107°, whereas BF₃ is trigonal planar with boWhich of the following overlaps is positive (gives bonding)?A sigma (σ) bond is formed by:A pi (π) bond is characterised by:In sp hybridisation, each hybrid orbital has the following s and p character:In BeCl₂ (gaseous), the central Be is sp-hybridised. The molecular geometry and Cl–Be–Cl bond angle are:The hybridisation of the central atom and shape of NH₃ are:Hybridisation of the central atom in PCl₅ is:In PCl₅, the axial P–Cl bonds are slightly *longer* than the equatorial ones because:The hybridisation of S in SF₆ is:The hybridisation of each carbon in ethyne (C₂H₂) is:According to MO theory, the bond order in a molecule is:Why does the He₂ molecule not exist according to MO theory?The paramagnetism of O₂ is explained by MO theory because the molecule has:For homonuclear diatomic molecules of B₂, C₂, N₂, the correct MO energy ordering is:The bond order in N₂, O₂ and O₂²⁻ (peroxide) are respectively:A hydrogen bond is formed when an H atom is covalently bonded to:Which of the following is an example of *intramolecular* hydrogen bonding?The magnitude of hydrogen bonding in a compound is:Isoelectronic species N₂, CO and NO⁺ all have a bond order of:The dipole moment of a molecule of the form AB_n depends on:An ionic bond is formed by:A covalent bond involves:According to VSEPR theory, the geometry of CH₄ around the carbon atom is:The geometry of water (H₂O) is:The hybridisation of carbon in ethylene (C₂H₄) is:The hybridisation of nitrogen in ammonia (NH₃) is:Among HF, HCl, HBr and HI, the molecule with the highest dipole moment is:The maximum number of bonds an oxygen atom can normally form is:A hydrogen bond is best described as the attraction between H attached to a highly electronegative atom and:Bond order in molecular orbital theory is defined as:Among N₂, O₂, F₂ and Ne₂, the molecule with the highest bond order is:Which of the following diatomic species is paramagnetic in its ground state?The shape of SF₆ is:In a coordinate (dative) bond, the shared pair of electrons:Among the following, the molecule with a zero dipole moment despite polar bonds is: