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
Chemical potential (an intensive property) of a substance is a force that drives the chemical system to equilibrium and is equal to its partial molar properties. The reatio of chemical potential to free energy of a pure substance at oconstant temperature and pressure is
A 0
B 1
C ∞
D None of these
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
If ΔG (free energy change) for a chemical reaction is very large and negative, then the reaction is
A Not feasible
B Just feasible
C Very much feasible
D Unpredictable as ΔG is no measure of feasibility of a reaction
A catalyst in a chemical reaction __________ free energy change in the reaction.
A Increases
B Decreases
C Either A or B; depends on the type of catalyst
D Neither A nor B
A chemical reaction will occur spontaneously at constant pressure and temperature, if the free energy is
A Zero
B Positive
C Negative
D None of these

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