Pick out the correct statement?

Related Mcqs:

1. Pick out the correct statement ?

   A. A chemical reaction accompanied by absorption of heat is called an exothermic reaction
   B. A chemical reaction accompanied by evolution of heat is called an endothermic reaction
   C. The rate constant for a first order reaction does not change on changing the concentration units
   D. Chemical equilibrium state is dynamic in nature

2. Pick out the correct statement ?

   A. A catalyst speeds up the forward reaction but slows shown the reverse reaction
   B. Addition of catalyst changes the equilibrium constant
   C. Pressure changes do not change the equilibrium concentrations
   D. The composition of equilibrium is changed by catalyst

3. Pick out the correct statement ?

   A. A catalyst does not change AH of the reaction
   B. A catalyst changes the equilibrium point
   C. Law of mass action was suggested by Le-Chatelier
   D. The difference between the energy of reactants and that of the products is the activation
   energy

4. Pick out the correct statement?

   A. In catalytic reactions, the catalyst reacts with the reactants
   B. A catalyst initiates a chemical reaction
   C. A catalyst lowers the activation energy of the reacting molecules
   D. A catalyst cannot be recovered chemically unchanged at the end of the chemical reaction

5. Pick out the correct statement?

   A. Reactions with high activation energies are very temperature sensitive
   B. Chemical equilibrium is a static state
   C. A photochemical reaction is catalysed by light
   D. A chemical reaction occurs when the energy of the reacting molecule is less than the activation energy of the reaction

6. If n = overall order of a chemical reaction. a = initial concentration of reactant. t = time required to complete a definite fraction of the reaction. Then pick out the correct relationship ?

   A. t ∝ 1/an
   B. t ∝ 1/an – 1
   C. t ∝ 1/an + 1
   D. t ∝ an

7. Pick out the wrong statement ?

   A. For a first order consecutive reaction, a tubular flow reactor as compared to a stirred tank
   reactor provides higher overall selectivity
   B. For an ideal mixed reactor at steady state, the exit stream has the same composition as fluid
   within the reactor and the space time is equivalent to holding time for constant density system
   C. Plug flow reactor (PFR) is always smaller than mixed reactor for all positive reaction orders
   for a particular duty
   D. Reaction rate does not decrease appreciably as the reaction proceeds in case of an
   autocatalytic reaction

8. Pick out the wrong statement ?

   A. Autocatalytic reactions are exemplified by microbial fermentation reactions
   B. The slowest step has the greatest influence on the overall reaction rate in case of an
   irreversible series reaction
   C. The fractional conversion at any time is same for both the constant as well as the variable
   volume system in case of an irreversible unimolecular type first order reaction
   D. Hydrolysis of ester in presence of alkali or acid is a zero order reaction

9. Pick out the wrong statement?

   A. In a first order reaction, A → products; the reaction becomes slower as it proceeds, because
   the concentration of A decreases and the rate is proportional to the concentration of A
   B. Transition state theory approaches the problem of calculating reaction rates by concentrating
   on the idea of activated complexes
   C. According to the penetration theory, the mass transfer co-efficient decreases, if the exposure
   time of an eddy to the solute decreases
   D. If the rate of an irreversible reaction, A + B → 2C is k.CA.CB, then the reaction is always
   elementary

10. Pick out the wrong statement ?

    A. In a batch reactor, which is exclusively used for liquid phase reactions; temperature pressure and composition may vary with time
    B. In a semi-batch reactor, one reactant is charged batch wise, while the other reactant is fed continuously
    C. In a continuous flow reactor, uniform concentration cannot be maintained throughout the vessel even in a well agitated system
    D. In a continuous flow reactor, both the reactants and the products flow out continuously