A. Always irreversible
B. Insensitive to temperature changes
C. Mostly irreversible
D. Highly temperature sensitive
Related Mcqs:
- The rate expression for a heterogeneous catalytic reaction is given by, – rA = K.KA PA(1 + KA.PA + KR.PR), where K is surface reaction rate constant and KA and KR are absorption equilibrium constants of A and R respectively. If KR PR >> (1 + KA PA), the apparent activation energy EA is equal to (given E is the activation energy for the reaction and ΔHR and ΔHA are the activation energies of adsorption of R and A) ?
A. E
B. E + ΔHA
C. E + ΔHA – ΔHR)
D. ΔHA + ΔHR - Rate constant for a first order reaction does not depend upon reaction time, extent of reaction and the initial concentration of reactants; but it is a function of reaction temperature. In a chemical reaction, the time required to reduce the concentration of reactant from 100 gm moles/litre to 50 gm moles/litre is same as that required to reduce it from 2 gm moles/litre to 1 gm mole/litre in the same volume. Then the order of this reaction is ?
A. 0
B. 1
C. 2
D. 3 - 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 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 the 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 - The reactions with low activation energy are _____________________?
A. Always spontaneous
B. Slow
C. Fast
D. Non-spontaneous - For the chemical reaction P → Q, it is found that the rate of reaction doubles as the concentration of ‘P’ is doubled. If the reaction rate is proportional to Cp n, then what is the value of ‘n’ for this chemical reaction ?
A. 0
B. 1
C. 2
D. 3 - 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. - 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.