Thermodynamic equilibrium constant in a system is affected by___________________?

Related Mcqs:

1. The equilibrium constant for the reversible reaction as shown in the bellow figure, is affected by the__________________?

   A. Temperature of the system
   B. Presence or absence of inerts
   C. Pressure of the system
   D. Kinetics of the reaction

2. For the reversible reaction A ⇌ 2B, if the equilibrium constant K is 0.05 mole/litre; starting from initially 2 moles of A and zero moles of B, how many moles will be formed at equilibrium ?

   A. 0.253
   B. 0.338
   C. 0.152
   D. 0.637

3. In a reversible chemical reaction having two reactants in equilibrium, if the concentration of the reactants are doubled, then the equilibrium constant will________________?

   A. Remain the same
   B. Be halved
   C. Also be doubled
   D. Become one fourth

4. The equilibrium constant of a catalytic chemical reaction _______________ due to the presence of?

   a catalyst.
   A. Increases
   B. Decreases
   C. Remain unaffected
   D. Unpredictable from the data

5. The rate expression for a heterogeneous catalytic reaction is given by, – rA = K.KA PA(1 + KA.PA + KR.PR), where K is surface reaction rate constant and KA and KR are absorption equilibrium constants of A and R respectively. If KR PR >> (1 + KA PA), the apparent activation energy EA is equal to (given E is the activation energy for the reaction and ΔHR and ΔHA are the activation energies of adsorption of R and A) ?

   A. E
   B. E + ΔHA
   C. E + ΔHA – ΔHR)
   D. ΔHA + ΔHR

6. The equilibrium constant ‘K’ of a chemical reaction depends on_________________?

   A. Temperature only
   B. Pressure only
   C. Temperature and pressure
   D. Ratio of reactants

7. For an ideal gas mixture undergoing a reversible gaseous phase chemical reaction, the equilibrium constant ?

   A. Is independent of pressure
   B. Increases with pressure
   C. Decreases with pressure
   D. Increases /decreases with pressure depending on the stoichiometric co-efficients of the
   reaction

8. If helium is introduced in a reactor containing O2, SO2 and SO3 at equilibrium, so that total pressure increases while volume and temperature remains constant. In this case the dissociation of SO3 (as per Le Chatelier’s principle)?

   A. Decreases
   B. Increases
   C. Remains unaltered
   D. Changes unpredictably

9. In the gaseous phase ammonia formation reaction (N2 + 3H2 ⇌ 2NH3), the value of the equilibrium constant depends on the_________________?

   A. Total pressure of the system
   B. Volume of the reactor
   C. Temperature
   D. Initial concentration of N2 and H2

10. The rate controlling step for the heterogeneous irreversible catalytic reaction A(g) + B(g) → C(g) is the surface reaction of absorbed A with absorbed B to give adsorbed C. The rate expression for this reaction can then be written as (where, KA, KB and KC are the equilibrium constants and is the rate constant of the rate controlling step) ?

    A. k KA pApB / (1 + KApA + KBpB)
    B. k KAKB pApB / (1 + KApA + KBpB)
    C. k KAKB pApB / (1 + KApA + KBpB + KCpC)
    D. k KAKB pApB / (1 + KApA + KBpB + KCpC)2