CBSE Class 11 Chemistry Chemical Bonding and Molecular Structure MCQs

Question: The attractive force which holds various constituents (atoms, ions etc.) together in different chemical species is called a

• a) chemical bond
• b) ionic bond
• c) chemical compound
• d) covalent bond

Answer: chemical bond

Question: The evolution of various theories of valence and the interpretation of the nature of chemical bonds have closely been related to the developments in the understanding of

• a) All of the above
• b) periodic table
• c) electronic configuration of elements
• d) structure of atom

Answer: All of the above

Question: Who provide explanation of valence based on intertness of noble gases ?

• a)

  

• b) Sidgwick & Powell
• c) Lewis
• d) Langmuir

Answer:

Question: In the formation of a molecule which of the following take part in chemical combination?

• a) valence electron
• b) cation
• c) anion
• d) inner shell electron

Answer: valence electron

Question: The bond formed as a result of the electrostatic attraction between the positive and negative ions is termed as ...

• a) Electrovalent bond
• b) Covalent bond
• c) Chemical bond
• d) Co-ordinate bond

Answer: Electrovalent bond

Question: Cation and anion combines in a crystal to form following type of compound

• a) ionic
• b) covalent
• c) metallic
• d) dipole-dipole

Answer: ionic

Question: Electrovalence of calcium and chlorine respectively is

• a) + 2, – 1
• b) 1, – 2
• c) + 1, – 1
• d) + 2, – 2

Answer: + 2, – 1

Question: When a metal atom combines with non-metal atom, the non-metal atom will

• a) gain electrons and increase in size
• b) gain electrons and increase in size
• c) lose electrons and increase in size
• d) lose electrons and decrease in size

Answer: gain electrons and increase in size

Question: In N₂ molecule, the number of electrons shared by each nitrogen atom is

• a) 3
• b) 2
• c) 5
• d) None of these

Answer: 3

Question: The lowest energy structure is the one with the ______ formal charges on the atoms.

• a) smallest
• b) highest
• c) zero
• d) negative

Answer: smallest

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

Question: In the cyanide ion, the formal negative charge is on

• a) N
• b) C
• c) Both C and N
• d) Resonate between C and N

Answer: N

Question: What are the exceptions of the octet rule ?

• a) All of these
• b) Expanded octet of the central atom
• c) An odd number of electrons on central atom
• d) The incomplete octet of central atom

Answer: All of these

Question: In which of the following molecules octet rule is not followed?

• a) NO
• b) CH₄
• c) NH₃
• d) CO₂

Answer: NO

Question: Among the following the electron deficient compound is

• a) BCl₃
• b) PCl₅
• c) CCl₄
• d) BeCl₂

Answer: BCl₃

Question: Which of the following is the electron deficient molecule?

• a) B₂H₆
• b) PH₃
• c) SiH₄
• d) None of these

Answer: B₂H₆

Question: Which of the following compounds does not follow the octet rule for electron distribution?

• a) PCl₅
• b) H₂O
• c) PH₃
• d) PCl₃

Answer: PCl₅

Question: Which of the following pairs will form the most stable ionic bond ?

• a) Mg and F
• b) Na and F
• c) Na and Cl
• d) Li and F

Answer: Mg and F

Question: Which of the following methods is used for measuring bond length ?

• a) All of these
• b) Spectroscopic techniques
• c) Electron-diffraction
• d) X-ray diffraction

Answer: All of these

Question: _______ is measured as the radius of an atom’s core which is in contact with the core of an adjacent atom in a bonded situation.

• a) Covalent radius
• b) Ionic radius
• c) Bond length
• d) van der Waal’s radius

Answer: Covalent radius

Question: All the bond lengths of sulphur – oxygen in sulphate ion, are equal because of:

• a) resonance
• b) symmetry
• c) high electronegativity of oxygen
• d) None of these

Answer: resonance