Class XI

 Elevation of boiling points occur due to
  1. Presence of impurities
  2. A reduced pressure
  3. A high pressure
  4. Lower rate of evaporation
Range of −5 oC to −25 oC is of
  1. Range of −5 oC to −25 oC is of
  2. Depression of freezing point of ice
  3. Melting salted ice
  4. Melting pure ice
NH4 has
  1. Positive charge
  2. Double positive charge
  3. Negative charge
  4. Double negative charge
Graphite is a good conductor of electricity due to
  1. Strong electrostatic bonding
  2. Free localized bonds
  3. Free delocalized electrons
  4. tetrahedral arrangement of particles
 Common covalent bonds include
  1. MgO
  2. KF
  3. LiCl
  4. CH4
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