Class XI

The mass of a gas dissolved in a given mass of a solvent at any temperature is proportional to the pressure of the gas above the solvent.
  1. Arrhenius
  2. Le Chatelier
  3. Haber.s process.
  4. Henry’s law
At a particular temperature and atmospheric pressure, the solid and liquid phases of a pure substance can exist in equilibrium. Which of the following term defines this temperature?
  1. Equilibrium temperature
  2. Phase change temperature
  3. Normal melting point and Freezing point
  4. Boiling point
A catalyst increases the rate of the chemical reaction for the conversion of reactants to products by
  1. lowering the equilibrium composition of a reaction mixture
  2. lowering the temperature
  3. making available a new low energy pathway
  4. increasing the activation energy for the forward reaction
Assuming complete dissociation, calculate the pH of 0.002 M KOH solution.
  1. 10.93
  2. 11.31
  3. 2.01
  4. 10.11 only
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
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