NEET Chemistry Chemical Bonding and Molecular Structure MCQs Set A

Question: Which of the following species contains three bond pairs and one lone pair around the central atom?

• a) NH₂^–
• b) PCl₃
• c) H₂O 
• d) BF₃   

Answer:  PCl₃

Question: Which one of the following pairs of chemical species contains the ions having same hybridisation of the central atoms?

• a) NO₂^–and NH₂^–
• b) NO₂^– and NO₃^– 
• c) NH₄⁺  and NO₃^– 
• d) SCN^–  and NH₂^–

Answer: NO₂^– and NO₃^– 

Question:  The geometry of electron pairs around S in SF₆ is

• a) Octahedral
• b) Trigonal bipyramidal
• c) Square pyramidal
• d) Pentagonal planar

Answer: Octahedral

Question: The correct order of increasing bond angles in the following triatomic species is

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:  In the hydrocarbon

The state of hybridization of carbons 1, 3 and 5 are in the following sequence

• a) (1) sp³, sp², sp 
• b) sp², sp, sp³  
• c) sp, sp³, sp² 
• d) sp, sp², sp³

Answer: sp, sp³, sp² 

Question:   The BCl₃ is a planar molecule whereas NCl₃ is pyramidal because

• a) Nitrogen atom is smaller than boron atom
• b) BCl₃ has no lone pair but NCl₃ has a lone pair of electrons
• c) B – Cl bond is more polar than N – Cl bond
• d) N – Cl bond is more covalent than B – Cl bond

Answer:  BCl₃ has no lone pair but NCl₃ has a lone pair of electrons

Question: Which of the following bonds has the highest bond energy?

• a) S–S 
• b) O–O 
• c) Se–Se
• d) Te–Te

Answer:  S–S 

Question: The low density of ice compared to water is due to

• a) Dipole-induced dipole interactions
• b) Induced dipole induced dipole interactions
• c) Hydrogen bonding interactions
• d) Dipole-dipole interactions

Answer: Hydrogen bonding interactions

Question:

 bond present in

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: Which compound has planar structure?

• a) XeF₄
• b) XeOF₂
• c) XeO₂F₂
• d) XeO₄

Answer:  XeF₄

More Questions.............................

Question: Which of the following pairs are isostructural?

• a) XeF₂, IF₂^–
• b) NH₃, BF₃
• c) CO₃^–2, SO₃^–2
• d) PCl₅, ICl₅

Answer:  XeF₂, IF₂^–

Question: In which of the following bond angle is maximum?

• a) NH₃
• b) NH₄⁺
• c) PCl₃
• d) SCl₂

Answer:  NH₄⁺

Question:  Main axis of a diatomic molecule is z, orbital p_x and p_y overlap with each other to form which of the followingmolecular orbitals?

• a) π molecular orbital
• b) σ molecular orbital
• c) δ molecular orbital
• d) No bond will form

Answer:  No bond will form

Question: Which one of the following statements is not correct for sigma- and pi-bonds formed between two carbon atoms?

• a) Sigma-bond is stronger than a pi-bond
• b) Bond energies of sigma- and pi-bonds are of the order of 264 kJ/mol and 347 kJ/mol, respectively
• c) Free rotation of atoms about a sigma-bond is allowed but not in case of a pi-bond
• d) Sigma-bond determines the direction between carbon atoms but a pi-bond has no effect in this regard

Answer: Bond energies of sigma- and pi-bonds are of the order of 264 kJ/mol and 347 kJ/mol, respectively

Question:  H₂O is polar, whereas BeF₂ is not. It is because

• a) The electronegativity of F is greater than that of O
• b) H₂O involves hydrogen bonding whereas BeF₂ is a discrete molecule
• c) H₂O is linear and BeF₂ is angular
• d) H₂O is angular and BeF₂ is linear

Answer:  H₂O is angular and BeF₂ is linear

Question:  In BrF₃ molecule, the lone pairs occupy equatorial positions to minimize

• a) Lone pair-bond pair repulsion only
• b) Bond pair-bond pair repulsion only
• c) Lone pair-lone pair repulsion and lone pair-bond pair repulsion
• d) Lone pair-lone pair repulsion only

Answer: Lone pair-lone pair repulsion and lone pair-bond pair repulsion

Question: The correct sequence of increasing covalent character is represented by

• a) LiCl < NaCl < BeCl₂
• b) BeCl₂ < LiCl < NaCl
• c) NaCl < LiCl < BeCl₂
• d) BeCl₂ < NaCl < LiCl

Answer:  NaCl < LiCl < BeCl₂

Question: Which of the following would have a permanent dipole moment?

• a) SiF₄
• b) SF₄
• c) XeF₄
• d) BF₃

Answer: SF₄

Question: Which of the following species has a linear shape?

• a) O₃
• b) NO₂^–
• c) SO₂
• d) NO₂⁺

Answer: NO₂⁺

Question: The correct order regarding the electronegativity of hybrid orbitals of carbon is

• a) sp < sp² < sp³
• b) sp > sp² < sp³
• c) sp > sp² > sp³
• d) sp < sp² > sp³

Answer: sp > sp² > sp³

Question: In which of the following molecules all the bonds are not equal?

• a) NF₃
• b) CIF₃
• c) BF₃
• d) PF₃

Answer: CIF₃

Question: The correct order of C — O bond order among CO,CO₃^2–,CO₂ is

• a) CO < CO₃^2– < CO₂
• b) CO₃^2– < CO₂< CO
• c) CO < CO₂< CO₃^2–
• d) CO₂< CO₃^2– < CO

Answer: CO₃^2– < CO₂< CO

Question:  In a regular octahedral molecule, MX6 the number of X – M – X bonds at 180º is

• a) Three
• b) Two
• c) Six
• d) Four

Answer: Three

Question:  The table shown below gives the bond dissociation energies (E_diss ) for single covalent bonds of carbon(C) atoms with element A, B, Z and D. Which element has the smallest atoms?

• a) Z
• b) D
• c) A
• d) B

Answer: D

Question:  Which one of the following has the strongest O – O bond?

• a) O₂⁺
• b) O₂ 
• c) O₂^–
• d) O₂^2–

Answer: O₂⁺

Question:  N₂  and O₂ are converted into monoanions N₂^– and O₂^– respectively, which of the following statements is wrong?

• a) In O₂^–, bond length increases
• b) N₂^– becomes diamagnetic
• c) In N₂^–, the N–N bond weakens
• d) In O₂^–, the O–O bond order decreases

Answer: N₂^– becomes diamagnetic

Question: Which species does not exhibit paramagnetism?

• a) N₂⁺
• b) O₂^– 
• c) CO
• d) NO

Answer: CO

Question:  In NO₃^– ion number of bond pair and lone pair of electrons on nitrogen atom are

• a) 2, 2
• b) 3, 1
• c) 1, 3
• d) 4, 0

Answer: 4, 0

Question: In an octahedral structure, the pair of d orbitals involved in sp³d² hybridisation is

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: Which one of the following species does not exist under normal conditions?

• a) Li₂
• b) Be₂⁺  
• c) Be₂ 
• d) B₂

Answer: Be₂