Class XI

Compounds evaporating easily and giving off a smell are
  1. Ionic compounds
  2. Covalent bonds
  3. Metallic bonds
  4. Dative bonds
Particles are arranged in regular rows in
  1. Solids
  2. Liquids
  3. Gases
  4. All of these
While forming crystals, it is important to
  1. evaporate to dryness to get purest possible crystals
  2. attach gas syringes to collect fumes
  3. not evaporate water of crystallization
  4. use high flames
 In order to test presence of sulphates,
  1. Dilute HNO3 + Ba(NO3)2 shall be added
  2. Dilute HCl shall be added
  3. Dilute NaOH shall be added
  4. Diazo aEnt shall be used
All are covalent compounds except
  1. NO2
  2. SO3
  3. SO2
  4. HNO3
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