If CA is the quantity of reactants initially present, the quantity left after ‘n’ half periods will be equal to__________________?

Related Mcqs:

1. 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

2. What is the order of a chemical reaction in which doubling the initial concentration of the reactants doubles the half life time of the reaction ?

   A. 0
   B. 1
   C. 2
   D. 3

3. In a reaction, the threshold energy is equal to (where, A = activation energy N = normal energy of reactants) ?

   A. A
   B. N
   C. A + N
   D. A – N

4. In a zero order reaction, reactants concentration does not change with time and the_________________?

   A. Time for half change is half the time taken for completion of the reaction
   B. Time for half change is independent of the initial concentration
   C. Time for completion of the reaction is independent of the initial concentration
   D. Reaction rate is trebled when the initial concentration is trebled

5. Rate of a chemical reaction is independent of the concentration of the reactants for a _________________ reaction?

   A. Zero order
   B. Third order
   C. Consecutive
   D. None of these

6. The excess energy of reactants in a chemical reaction required to dissociate into products is termed as the _______________ energy?

   A. Activation
   B. Potential
   C. Binding
   D. Threshold

7. The excess energy of the reactants required to dissociate into products is known as the ________________ energy?

   A. Thermal
   B. Activation
   C. Threshold
   D. Binding

8. Rate constant for a first order reaction does not depend upon reaction time, extent of reaction and the initial concentration of reactants; but it is a function of reaction temperature. In a chemical reaction, the time required to reduce the concentration of reactant from 100 gm moles/litre to 50 gm moles/litre is same as that required to reduce it from 2 gm moles/litre to 1 gm mole/litre in the same volume. Then the order of this reaction is ?

   A. 0
   B. 1
   C. 2
   D. 3

9. In an exothermic chemical reaction, the reactants compared to the products have__________________?

   A. Higher temperature
   B. More energy
   C. Less energy
   D. Same energy

10. If the time required to complete a definite fraction of reaction varies inversely as the concentration of the reactants, then the order of reaction is________________?

    A. 1
    B. 2
    C. 3
    D. 4