Class XI

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
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
Amines behave as
  1. Lewis acids
  2. neutral compound
  3. Lewis base
  4. aprotic acid
The solutions which resist change in pH on dilution or with the addition of small amounts of acid or alkali
  1. electrolytic solutions
  2. Buffer Solutions.
  3. Bronsted-Lowry acids and bases
  4. conjugate pair of acid-base
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. Both sugar and NaCl ionises completely in water thereby increasing the conductance
  3. Sugar releases more ions in water and increases conductance
  4. NaCl ionises completely in water and increase in concentration of salt increases conductance.
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