General
✓✗In which of the following does the bond order increase when one electron is removed?
- C2
- N2
- B2
- O2
General
✓✗The type of intermolecular force present between Cl2 molecules is
- London dispersion forces
- ion-dipole forces
- dipole-dipole forces
- hydrogen bonding
General
✓✗The hybridisations of Xe in XeF2, XeF4 and XeF6 are respectively
- sp3d, sp3d2 and sp3d3
- sp3d2, sp3d2 and sp3d2
- sp3, sp3d and sp3d2
- sp, sp2 and sp3
General
✓✗Which of the following pairs of ions is isoelectronic and isostructural?
- ClO3−, NO3−
- ClO3−, CO32−
- CO32−, NO3−
- SO32−, NO3−
General
✓✗The overlap of two s orbitals gives a
- hydrogen bond
- δ bond
- π bond
- σ bond
General
✓✗The formal charge on an atom in a Lewis structure is calculated as
- valence electrons + non-bonding electrons
- bonding electrons − non-bonding electrons
- atomic number − valence electrons
- valence electrons − non-bonding electrons − (bonding electrons/2)
General
✓✗Which overlap leads to the strongest bond?
- p-p sideways overlap
- s-s overlap
- p-p axial overlap
- s-p sideways overlap
General
✓✗Which of the following molecules has the maximum dipole moment?
- NF3
- CO2
- NH3
- CH4
General
✓✗Lattice enthalpy of an ionic compound is directly related to
- the product of ionic charges and inversely to the sum of ionic radii
- the number of covalent bonds
- only the size of the cation
- only the size of the anion
General
✓✗The correct order of dipole moments for the molecules NH3, H2S, CH4 and HF is
- HF > NH3 > H2S > CH4
- NH3 > HF > CH4 > H2S
- H2S > NH3 > HF > CH4
- CH4 > H2S > NH3 > HF
General
✓✗As the bond order increases, the bond enthalpy
- remains the same
- decreases
- increases
- becomes zero
General
✓✗Which of the following has zero dipole moment?
- CH3Cl
- CCl4
- CHCl3
- CH2Cl2
General
✓✗The octet rule cannot explain all of the following EXCEPT
- the stability of NO
- the formation of NaCl
- the bonding in BF3
- the existence of PCl5
General
✓✗During the change of O2 to O2−, the added electron goes into which one of the following orbitals?
- σ orbital
- σ* orbital
- π orbital
- π* orbital
General
✓✗Which of the following species has the same number of valence electrons as CO2?
- O3
- SO2
- NO2
- N3−