Related Questions

The minimum energy required to allow a chemical reaction to proceed is termed as the 'threshold energy '. Chemical reaction with low activation energy are
A Always irreversible
B Insensitive to temperature changes
C Mostly irreversible
D Highly temperature sensitive
A chemical reaction occurs when the energy of the reacting molecules is __________ the activation energy of the reaction.
A Less than
B Equal to
C More than
D Equal to or more than
A chemical reaction occurs, when the energy of the reacting molecules is __________ the activation energy of reaction.
A Less than
B Equal to
C More than
D Equal to or more than
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
When an exothermic reversible reaction is conducted adiabatically, the rate of reaction
A Continuously increases
B Continuously decreases
C Passes through a maximum
D Passes through a minimum
Enzymes (a protein) are catalysts found in organisms. Its efficiency of catalysing a reaction is due to its capacity to lower the activation energy of the reaction. The enzyme ptyalin used for food digestion is present in
A Blood
B Saliva
C Intestine
D Gland
In an exothermic reaction, the energy of the reacting substances as compared to that of products is
A More
B Less
C Same
D Either A or B, depends on order of reaction
Which of the following is a characteristic of an exothermic reaction?
A Release of heat
B Absorption of heat
C Doesn't involve any change in temperature
D None of the option is correct
What is an exothermic reaction?
A Reaction in which heat is released.
B Reaction in which heat is absorbed.
C Reaction in which neither heat is released nor absorbed.
D None
In case of staged packed bed reactors carrying out exothermic reaction, use
A High recycle for pure gas
B Plug flow for dilute liquid requiring no large preheating of feed
C Cold shot operations for a dilute solution requiring large preheating to bring the stream upto the reaction temperature
D All of the above

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