Class XI

For dissolution of gases in liquids, the concentration of a gas in liquid is.
  1. lower to the pressure of the gas as compared to the liquid
  2. proportional to the vapour pressure of the gas
  3. equal to the pressure of the gas in relation to the liquid
  4. proportional to the pressure of the gas over the liquid.
Hydronium ion concentration in molarity is more conveniently expressed on a logarithmic scale known as the
  1. litmus scale
  2. basic scale
  3. acidic scale
  4. pH scale
The aqueous solution of sugar does not conduct electricity. However, when sodium chloride is added to water, it conducts electricity. How will you explain this statement on the basis of ionisation and how is it affected by concentration of sodium chloride?
  1. Both sugar and NaCl ionises partially in water thereby increasing the conductance
  2. Sugar releases more ions in water and increases conductance
  3. NaCl ionises completely in water and increase in concentration of salt increases conductance.
  4. Both sugar and NaCl ionises completely in water thereby increasing the conductance
What is the best description of the change that occurs when Na2O(s) is dissolved in water?
  1. Oxidation number of sodium decreases
  2. Oxide ion accepts sharing in a pair of electrons
  3. oxide ion donates a pair of electrons
  4. Oxidation number of oxygen increases
The solubility of AgI in NaI solution is less than that in pure water because
  1. Agl forms complex with NaI
  2. of common ion effect
  3. solubility product of Agl is less than that of NaI
  4. the temperature of the solution decreases
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