VSEPR theory and shapes of molecules

12 solved questions

Ask a question

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
Match List I with List II.List I (Compound): A. NH_3 B. BrF_5 C. XeF_4 D. SF_6List II (Shape/geometry): I. Trigonal Pyramidal II. Square Planar III. Octahedral IV. Square PyramidalChoose the correct answer from the options given below: Answer: 2. A-I, B-IV, C-II, D-III Key idea: use VSEPR to get the shape of each molecule. NH₃ : 3 bond pairs + 1 lone pair gives trigonal pyr... VSEPR theory and shapes of molecules 1 answer
Amongst the following which one will have maximum 'lone pair - lone pair' electron repulsions ? Answer: 1. XeF₂ Key idea: compare the number of lone pairs on the central atom and their arrangement. XeF₂ : 3 lone pairs on Xe (trigonal bi... VSEPR theory and shapes of molecules 1 answer
The structures of beryllium chloride in solid state and vapour phase, are : Answer: 1. Chain and dimer, respectively Key idea: BeCl₂ is electron deficient and completes its octet by bridging. In the solid state it fo... VSEPR theory and shapes of molecules 1 answer
Match List - I with List - II.List - I : (a) PCl_5 (b) SF_6 (c) BrF_5 (d) BF_3List - II : (i) Square pyramidal (ii) Trigonal planar (iii) Octahedral (iv) Trigonal bipyramidalChoose the correct answer from the options given below. Answer: 1. (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii) Key idea: use VSEPR to find shapes. PCl₅ : 5 bond pairs, trigonal bipyramidal (iv) SF₆ : 6... VSEPR theory and shapes of molecules 1 answer
In the structure of ClF_3, the number of lone pairs of electrons on central atom 'Cl' is Answer: 3. two Count electron pairs on Cl in ClF₃ : Cl has 7 valence electrons, 3 are used for bonds with F, leaving 4 electrons = 2 lone pa... VSEPR theory and shapes of molecules 1 answer
The species, having bond angles of 120° is : Answer: 3. BCl₃ Key idea: 120^° belongs to a trigonal planar molecule with no lone pair on the central atom. BCl₃ : B has 3 bond pairs, sp²... VSEPR theory and shapes of molecules 1 answer
Which of the following pairs of compounds is isoelectronic and isostructural ? Answer: 2. IBr₂^-, XeF₂ Key idea: isoelectronic means equal number of valence electrons, isostructural means same shape. XeF₂ : 8 + 14 = 22... VSEPR theory and shapes of molecules 1 answer
Which of the following pairs of ions is isoelectronic and isostructural? Answer: Dropped in the official answer key: full marks to every candidate Key idea: compare total electrons and shape. CO₃²⁻ and NO₃^- : 32... VSEPR theory and shapes of molecules 1 answer
The correct geometry and hybridization for XeF_4 are Answer: 3. square planar, sp³d² Key idea: Xe in XeF₄ has 4 bond pairs and 2 lone pairs. Steric number 6 gives sp³d² hybridisation and an oct... VSEPR theory and shapes of molecules 1 answer
Predict the correct order among the following : Answer: 1. lone pair - lone pair > lone pair - bond pair > bond pair - bond pair Key idea (VSEPR): a lone pair is held only by one nucleus,... VSEPR theory and shapes of molecules 1 answer
Consider the molecules CH_4, NH_3 and H_2O. Which of the given statements is false ? Answer: 2. The H-O-H bond angle in H₂O is larger than the H-C-H bond angle in CH₄ . Key idea: lone pairs repel more than bond pairs, so bond... VSEPR theory and shapes of molecules 1 answer