The correct order of second ionisation potential of carbon, nitrogen, oxygen and fluorine is

If a molecule MX₃ has zero dipole moment, the sigma bonding orbitals used by M (atomic number < 21) are

The angle between two convalent bonds is maximum in ________. (CH₄, H₂O, CO₂)

The temperature at which a real gas obeys the ideal gas aws over a wide range of pressure is