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.
A vessel at 1000 K contains CO2 with a pressure of 0.5 atm. Some of the CO2 is converted into CO on the addition of graphite. If the total pressure at equilibrium is 0.8 atm, the value of K is
  1. 0.3 atm
  2. 3 atm
  3. 1.8 atm
  4. 0.18 atm
In the dynamic equilibrium stage, one of the following events take place. Choose the right one.
  1. no change in the concentrations of either of the reactants or products
  2. rates of the forward reaction is faster
  3. the concentrations of the reactants are decreased
  4. the concentrations of the products are increased
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
A certain buffer solution contains equal concentration of X¯ and HX . The Ka for HX is 10-8 . The pH of the buffer is
  1. 3
  2. 8
  3. 11
  4. 14
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