Chemical Bonding and Molecular Structure

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Topics

• Kossel-Lewis approach, ionic and covalent bonds 3
• Ionic bonding and lattice enthalpy 9
• Electronegativity, Fajan's rule, dipole moment 4
• VSEPR theory and shapes of molecules 12
• Valence bond theory, hybridization (s, p, d), resonance 7
• Molecular orbital theory, bond order, bond length, bond energy 7
• Metallic bonding and hydrogen bonding 4

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• Chemistry: Chemical Bonding and Molecular Structure – NEET practice test Practice set · NEET · 30 questions · 30 min

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• Identify the correct orders against the property mentioned :A. H_2O > NH_3 > CHCl_3 - dipole momentB. XeF_4 > XeO_3 > XeF_2 - number of lone pairs on central atomC. O-H > C-H > N-O - bond lengthD. N_2 > O_2 > H_2 - bond enthalpyChoose the correct ans… Answer: 1. A, D only A true: H₂O (1.85 D) > NH₃ (1.47 D) > CHCl₃ (1.04 D). B false: lone pairs on Xe are XeF₄ = 2, XeO₃ = 1, XeF₂ = 3, so th... Electronegativity, Fajan's rule, dipole moment 1 answer
• Match List - I with List - IIList-I: A. XeO_3 B. XeF_2 C. XeOF_4 D. XeF_6List-II: I. sp^3d; linear II. sp^3; pyramidal III. sp^3d^3; distorted octahedral IV. sp^3d^2; square pyramidalChoose the correct answer from the options given below : Answer: 1. A-II, B-I, C-IV, D-III Key idea: count bond pairs and lone pairs on Xe. XeO₃ : 3 bonds + 1 lone pair, sp³ , pyramidal (II). XeF₂... VSEPR theory and shapes of molecules 1 answer
• Given below are two statements :Statement I : A hypothetical diatomic molecule with bond order zero is quite stable.Statement II : As bond order increases, the bond length increases.In the light of the above statements, choose the most appropriate an… Answer: 2. Both Statement I and Statement II are false Key idea: bond order measures net bonding; it links to stability and bond length. Sta... Molecular orbital theory, bond order, bond length, bond energy 1 answer
• Identify the correct answer. Answer: 1. Three canonical forms can be drawn for CO₃²⁻ ion. Key idea: check each statement. mathrmCO₃²⁻ : three equivalent canonical forms.... Valence bond theory, hybridization (s, p, d), resonance 1 answer
• Arrange the following elements in increasing order of electronegativity:N, O, F, C, SiChoose the correct answer from the options given below: Answer: 2. Si < C < N < O < F Key idea: electronegativity increases across a period and decreases down a group. Pauling values: Si 1.8 < C 2... Electronegativity, Fajan's rule, dipole moment 1 answer
• Intramolecular hydrogen bonding is present in Answer: 2. [structure: 2-nitrophenol (NO2 and OH on adjacent carbons), see figure] Key idea: intramolecular H-bonding needs the H-donor (-OH... Metallic bonding and hydrogen bonding 1 answer