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