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1. Equilibrium is best defined as
A. Stage where the concentration of reactants is less than that of products
B. Stage where concentration of reactants is equal to that of products
C. Stage where the rate of forward reaction is equal to that of backward reaction
D. Stage where the concentration of reactants is more than that of products
2. Which of the folowing characterizes Equilibrium
A. Dynamic nature
B. Requires a closed system
C. Can be physical or chemical
D. All of the above
3. Equilibrium can be attained in
A. all types of system
B. closed system
C. open system
D. isolated system
4. A moles of A reactants react with b moles of B reactants to form c moles of product C. Which of the following is true for rate of reaction
A. Rate= k[A][B]
B. Rate=k[A]a[B]b
C. Rate=k[A]a+[B]b
D. Rate=k[A]a[B]b/[C]c
5. Which one of the following is correct about a reversible chemical reaction at equilibrium
A. all chemical reactions have ceased
B. the rates of the forward and reverse reactions are equal
C. the rate constants of the forward and reverse reactions are equal
D. the value of the equilibrium constant is 1
6. Which are not the conditions of setting of an equilibrium
A. All reactions should be carried out at STP
B. All reactions should be carried out at constant temperature
C. All reactions should be carried out in open containers
D. Gaseous reactions should be carried out in closed containers
7. When ice is in equilibrium with water,during equilibrium
A. Amount of ice melting is equal to amount of water freezing
B. There is no melting and no freezing
C. Amount of ice melting is more than amount of freezing
D. Amount of ice is equal to amount of water
8. Which is not the characteristics of equilibrium
A. Rate of forward is equal to the rate of backward reaction
B. The concentrations of reacting substances remains static
C. The pressure, temperature ,enthalpy change of the system is zero
D. Reaction completely cease at equilibrium
9. In which of the following reaction can equilibrium be attained
A. Reversible reaction
B. Cyclic reaction
C. Decomposition reaction
D. Irreversible reaction
10. Rate of reaction is proportional to product of molar concentration of reactants with each concentration term raised to power its stiochiometric coefficient. This is the law of
A. Equilibrium
B. Mass action
C. Constant proportion
D. Reciprocal proportions
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