Class XI

Blood has an approximate pH of
  1. 3 to 4
  2. 7 to 8
  3. 10 to 11
  4. 13 to 14
A constant temperature at which a pure liquid changes into a gas is called
  1. Latent heat of vaporization
  2. Depression in freezing point
  3. Boiling point
  4. Melting point
A poisonous gas released in exhaust fumes is
  1. SO2
  2. CO2
  3. CO
  4. P2O5
An effective way of purifying liquids containing suspensions is
  1. Crystallization
  2. Decanting
  3. Centrifuging
  4. Separating funnel
Gases denser than air include
  1. Carbon dioxide
  2. Oxygen
  3. Hydrogen
  4. Ammonia
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