Class XI

Presence of impurities cause
  1. A fall in boiling point
  2. A rise in melting point
  3. A fall in condensation point
  4. None of Above
 Each color is associated with a particular pH in
  1. Litmus indicator
  2. Universal indicator
  3. Methyl orange indicator
  4. Phenolphthalein indicators
Examples of sublime substances include
  1. Alcohol
  2. Ammonia
  3. Nitrates
  4. Solid carbon dioxide
 Most common element in air is
  1. Hydrogen
  2. Nitrogen
  3. Oxygen
  4. Carbon
In Na2CO3.10H2O, highest percentage composition is of
  1. Sodium
  2. Oxygen
  3. Water
  4. Carbon
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