Question 41 : The rate constant of a first order reaction depends on the
1. temperature.
2. concentration of the product.
3. concentration of the reactant.
4. time
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Question 42 : The ratio of volume of mixed reactor to the volume of P.F.R. (for identical flow rate, feed composition and conversion) for zero order reaction is
1. >1
2. ?
3. 1
4. 0
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Question 43 : An autothermal reactor is
1. most suitable for a second order reaction.
2. most suitable for a reversible reaction.
3. completely self-supporting in its thermal energy requirements.
4. isothermal in nature.
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Question 44 : __________ is the controlling step in a highly temperature sensitive fluid-solid non-catalytic reaction.
1. none of these
2. Chemical reaction
3. Gas film diffusion
4. Ash diffusion
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Question 45 : A reaction in which one of the products of reaction acts as a catalyst is called a/an __________ reaction.
1. none of these
2. catalytic
3. autocatalytic
4. photochemical
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Question 46 : The reason why a catalyst increases the rate of reaction is that, it
1. decreases the energy barrier for reaction.
2. increases the activation energy.
3. decreases the molecular collision diameter.
4. none of these.
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Question 47 : 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
1. 1
2. 3
3. 2
4. 0
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Question 48 : When the density of the reaction mixture is constant in a chemical reaction, the ratio of the mean residence time to space time is
1. 1
2. > 1
3. 0
4. <1
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Question 49 : At a given value of E/R (ratio of activation energy and gas constant), the ratio of the rate constants at 500°K and 400°K is 2, if Arrhenious law is used. What will be this ratio, if transition state theory is used with the same value of E/R?
1. 2
2. 24
3. 5
4. 6
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Question 50 : Pick out the correct statement.
1. In catalytic reactions, the catalyst reacts with the reactants.
2. A catalyst can not be recovered chemi cally unchanged at the end of the chemical reaction.
3. A catalyst lowers the activation energy of the reacting molecules.
4. A catalyst initiates a chemical reaction.
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