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Gneet Chemistry. We covered all the Gneet Chemistry in this post for free so that you can practice well for the exam.
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Gneet Chemistry Objective for Students
According to the Arrhenius relationship, a linear graph is obtained when the logarithm of the rate constant (log k) is plotted against
a) Temperature (T)
b) log T
c) 1/T
d) log (1/T)
Option c – 1/T
The magnitude of activation energy for a reaction mainly depends on
a) Temperature
b) The nature of the reacting species
c) Frequency of collisions
d) Concentration of reactants
Option b – The nature of the reacting species
Enzymes accelerate chemical reactions primarily by
a) Reducing the activation energy barrier
b) Increasing the activation energy
c) Altering the equilibrium constant
d) Producing an enzyme–substrate complex
Option a – Reducing the activation energy barrier
Activation energy of a reaction can be calculated by
a) Comparing rate constants at two different temperatures
b) Measuring reaction rates at two different temperatures
c) Determining the rate constant at standard temperature
d) Varying the concentration of reactants
Option a – Comparing rate constants at two different temperatures
Collision theory gives the best explanation for
a) First-order reactions
b) Second-order reactions
c) Zero-order reactions
d) Bimolecular reactions
Option d – Bimolecular reactions
If the activation energy of a reaction is zero, the rate constant
a) Increases as temperature rises
b) Decreases as temperature falls
c) Decreases with increasing temperature
d) Remains unaffected by temperature
Option a – Increases as temperature rises
Activation energy refers to
a) The additional energy that must be supplied to a Molecule
b) The average kinetic energy of molecules
c) The minimum energy required for an effective collision
d) The total energy possessed by a reacting Molecule
Option a – The additional energy that must be supplied to a Molecule
Adding a catalyst to a reaction changes which of the following?
a) Entropy
b) Activation energy
c) Enthalpy
d) Internal energy
Option b – Activation energy
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