Class XI

Blood has an approximate pH of
  1. 3 to 4
  2. 7 to 8
  3. 10 to 11
  4. 13 to 14
To separate components of liquid air, useful procedure is
  1. Centrifugation
  2. Separating funnel
  3. Fractional distillation
  4. Simple distillation
Gases denser than air include
  1. Carbon dioxide
  2. Oxygen
  3. Hydrogen
  4. Ammonia
A poisonous gas released in exhaust fumes is
  1. SO2
  2. CO2
  3. CO
  4. P2O5
Gases heavier than air can be collected through
  1. Upward delivery
  2. Downward delivery
  3. Downward displacement of air
  4. Upwards displacement of air
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