Related Questions

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
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
The excess energy of reactants in a chemical reaction required to dissociate into products is termed as the __________ energy.
A Activation
B Potential
C Binding
D Threshold
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
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
The reactions with low activation energy are
A Always spantaneous
B Slow
C Fast
D Non-spontaneous
Threshold energy in a reaction is equal to the
A Activation energy
B Normal energy of reactants
C Sum of A & B
D Neither A nor B
The energy of activation of exothermic reaction is
A Zero
B Negative
C Very large compared to that for en-dothermic reaction
D Not possible to predict

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