Description : The order of reaction is the number of moles whose concentrations determine the rate of a reaction at a given temperature Give the integrated equation for first order reaction. K = (2.303 / t) * log (a ... a' is the initial concentration of reactants x' is the amount reacted in time t seconds
Last Answer : What is Threshold energy ?
Description : 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 afunction of reaction temperature. In a chemical reaction, the time required to ... Then the order of this reaction is: (A) 0 (B) 1 (C) 2 (D) 3
Last Answer : (B) 1
Description : Enzymes are destroyed, when the (A) Temperature is very high (B) Reactant's concentration is very high (C) Reactant's concentration is very low (D) Reaction rate is independent of the reactant's concentration
Last Answer : (A) Temperature is very high
Description : The rate constant of a chemical reaction decreases by decreasing the (A) Pressure (B) Concentration of reactants (C) Temperature (D) Duration of reaction
Last Answer : (C) Temperature
Description : Rate of a chemical reaction is not influenced by the (A) Catalyst (B) Temperature (C) Reactants concentration (D) Number of molecules of reactants taking part in a reaction
Last Answer : (D) Number of molecules of reactants taking part in a reaction
Description : According to the 'law of mass action', the rate of reaction is directlyproportional to the (A) Equilibrium constant (B) Volume of the reaction vessel (C) Nature of the reactants (D) Molar concentration of the reactants
Last Answer : (D) Molar concentration of the reactants
Description : If the rate of a chemical reaction becomes slower at a given temperature, then the (A) Initial concentration of the reactants remains constant (B) Free energy of activation is lower (C) Entropy changes (D) Free energy of activation is higher
Last Answer : (D) Free energy of activation is higher
Description : The rate constant of a reaction is a function of the (A) Time of reaction (B) Temperature of the system (C) Extent of reaction (D) Initial concentration of the reactants
Last Answer : (B) Temperature of the system
Description : The rate constant of a reaction depends on the (A) Initial concentration of reactants (B) Time of reaction (C) Temperature of the system (D) Extent of reaction
Last Answer : All of the carbon atoms are sp hybridized
Last Answer : (C) Temperature of the system
Description : 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
Last Answer : (A) Zero order
Description : The rate constant of a chemical reaction increases by increasing the (A) Temperature (B) Pressure (C) Reactant's concentration (D) None of these
Last Answer : (A) Temperature
Description : Rate of a chemical reaction is not affected by the (A) Catalyst (B) Temperature (C) Reactant’s concentration (D) Number of molecules of reactants taking part in the reaction
Last Answer : (D) Number of molecules of reactants taking part in the reaction
Description : . 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 ... is independent of the initial concentration (D) Reaction rate is trebled when the initial concentration is trebled
Last Answer : (A) Time for half change is half the time taken for completion of the reaction
Description : At very high concentration of enzymes, the rate of fermentation chemical reaction is __________ the concentration of reactants. (A) Independent of (B) Directly proportional to (C) Inversely proportional to (D) Proportional to the square of
Last Answer : (A) Independent of
Description : Pick out the wrong statement. (A) Wine, rum & Vodka are prepared by the formulation of fruit juice, sugar beet & rye respectively (B) Protein catalysts are called enzymes (C) The rate ... concentration of reactants at high concentration of enzymes (D) Total sugar content in molasses is about 10%
Last Answer : (D) Total sugar content in molasses is about 10%
Description : 25. In a reaction, A + B Product, rate is doubled when the concentration of B is doubled, and rate increases by a factor of 8 when the concentrations of both the reactants (A and B) are doubled, rate law for the reaction can be ... Rate = k[A] [B]2 (3) Rate = k[A]2 [B]2 (4) Rate = k[A] [B]
Last Answer : Rate = k[A]2 [B] (
Description : The rate of a chemical reaction can be affected by: w) temperature x) concentration of products y) concentration of reactants z) all of the above
Last Answer : ANSWER: Z -- ALL OF THE ABOVE
Description : What causes pressure changes of reactants to affect reaction rate?
Last Answer : The frequency of collisions is changed.
Description : Reverse reaction in a chemical equilibrium is favoured by the (A) Removal of one of the products regularly (B) Increase in the concentration of one of the products (C) Increase in the concentration of one of the reactants (D) None of these
Last Answer : (B) Increase in the concentration of one of the products
Description : 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
Last Answer : (A) Remain the same
Description : Which of the following will favour the reverse reaction in a chemical equilibrium reaction? (A) Increasing the concentration of one of the reactants (B) Increasing the concentration of one or more of the products (C) Removal of at least one of the products at regular interval (D) None of these
Last Answer : (B) Increasing the concentration of one or more of the products
Description : For a zero order chemical reaction, the (A) Half life period is directly proportion to the initial concentration of the reactants (B) Plot of products concentration with time is a straight line through the origin (C) Products concentration increases linearly with time (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : For a heterogeneous catalytic reaction (A) Free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction (B) A relatively small amount of catalyst ... with the reactant (D) The surface of the catalyst does not play an important role during reaction
Last Answer : (A) Free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction
Description : Velocity of a reaction depends upon the (A) Nature of the reactants (B) Concentration of the reactants (C) Temperature at which the reaction is carried (D) All (A), (B) and (C)
Description : 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
Last Answer : (B) 2
Description : 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
Last Answer : (A) 0
Description : Velocity of a chemical reaction (A) Decreases with increase in temperature (B) Increases with increase of pressure of reactants for all reactions (C) Decreases with increase of reactant concentration (D) None of these
Last Answer : (D) None of these
Description : Semibatch reactor is preferred, when a/an (A) A highly exothermic reaction is to be controlled (B) Undesirable side reaction (at high concentration of one of the reactants) is to be avoided (C) A gas is to be reacted with liquid (e.g. hydrogenation of fat) (D) All (A), (B), and (C
Last Answer : (D) All (A), (B), and (C
Description : What factor in reaction rate is related to the amount of reactants?
Last Answer : This is the concentration of reactants.
Description : Specific rate constant for a second order reaction (A) Is independent of temperature (B) Varies with temperature (C) Depends on the nature of the reactants (D) Both (B) and (C)
Last Answer : (D) Both (B) and (C)
Description : What happens when a catalyst is added to a system at equilibrium? A The reaction follows an alternative pathway of lower activation energy. B The heat of reaction decreases. C The potential ... decreases. D The potential energy of the products decreases. E The rate of chemical reaction decreases.
Last Answer : A The reaction follows an alternative pathway of lower activation energy.
Description : The Rate Law expresses the rate of a reaction in terms of the concentrations of the: w) reactants x) products y) by-products z) catalysts
Last Answer : ANSWER: W -- REACTANTS
Description : In a chemical reaction as shown in the bellow figure, it is observed that the (i) Rate of formation of 'P' is doubled on doubling the concentration of 'X' (ii) Rate of formation of 'P' is quadrupled ... of the above chemical reaction? (A) Zeroth order (B) First order (C) Second order (D) Third order
Last Answer : (D) Third order
Description : Which of the following set of conditions is favourable for the maximum yield of ammonia by Haber's process? (A) High pressure, low reactants concentration, high temperature (B) High ... , high reactants concentration, low temperature (D) Low pressure, high reactants concentration, low temperature
Last Answer : (C) High pressure, high reactants concentration, low temperature
Description : 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, ... system (D) In a continuous flow reactor, both the reactants and the products flow out continuously
Last Answer : (C) In a continuous flow reactor, uniform concentration cannot be maintained throughout the vessel even in a well agitated system
Description : Consider the following gas - phase reaction : `2A(g)+B(g)rArrC(g)+D(g)` An equilibrium mixture of reactants and products is subjected to the following
Last Answer : Consider the following gas - phase reaction : `2A(g)+B(g)rArrC(g)+D(g)` An equilibrium mixture of reactants and ... II, III C. II, III, IV D. I, III
Description : Which of the following reactants on reaction with conc. NaOH followed by acidification gives following lactone as the product?
Last Answer : Which of the following reactants on reaction with conc. NaOH followed by acidification gives following lactone as the product? A. B. C. D.
Description : If the only reactants of a reaction were zn and hci what does the law of conservation of mass say about the products?
Last Answer : Need answer
Description : Are the reactants always completely used up in a chemical reaction?
Description : If the reactants of a reaction are 2AgCIO3 and Na2CO3 which could be a product?
Last Answer : Ag2CO3 -apex
Description : If the total mass of the product in this chemical reaction is 14g what must the combined masses of the reactants be?
Last Answer : 4
Description : What are reactants that join together with an enzyme in a reaction?
Description : What happens to the total mass of the reactants in a chemical reaction?
Description : The only reactants in a reaction were Zn and HCI. What does the law of conservation of matter say about the products?
Last Answer : The product will contain only Zn, H, and CI. -Apex
Description : In the reaction A+B âž C+D, what are the reactants?
Last Answer : A and B
Description : A combination reaction occurs when two or more reactants form one product T or F?
Last Answer : T
Description : The reaction in which product mole- cules react and give back the original reactants is called?
Last Answer : Backward reaction