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
 Most common element in air is
  1. Hydrogen
  2. Nitrogen
  3. Oxygen
  4. Carbon
Brightness of battery light depends on the
  1. Polarization
  2. Difference in reactivity series of two metals in battery
  3. Volts of bulb attached to battery
  4. All of these
When dichromate (VI) ion becomes reduced to chromium (III) ion, a change of color occurs from
  1. Purple to pink
  2. Purple to colorless
  3. Orange to purple
  4. Orange to green
 Each color is associated with a particular pH in
  1. Litmus indicator
  2. Universal indicator
  3. Methyl orange indicator
  4. Phenolphthalein indicators
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