Related Questions

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
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
When the reaction occurs in the diffusion controlled region, the apparent activation energy as measured is only __________ the true value.
A Twice
B Half
C Equal
D None of these
The rate at which a substance reacts is proportional to its active mass and the rate of a chemical reaction is proportional to the product of active masses of the reacting substances. This is the
A Lewis-Randall rule
B Statement of Vant-Hoff equation
C Le-Chatelier's principle
D None of these
Higher free energy of activation of a chemical reaction (at a given temperature) implies
A Slower rate of reaction
B Higher rate of reaction
C Higher equilibrium conversion
D Both B and C
The energy of activation of a chemical reaction
A Is same as heat of reaction at constant pressure
B Is the minimum energy which the molecules must have before the reaction can take place
C Varies as fifth power of the temperature
D Both B and C
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
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
Number of degrees of freedom for a three phase system in equilibrium comprising of three non-reacting chemical species is
A 2
B 0
C 1
D 3
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

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