Class XI

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
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
State symbols include
  1. S
  2. I and aq
  3. I
  4. All of these
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