If 60% of a first order reaction was completed in 60 min, 50% of the same reaction would be completed in approximately
(log 4 = 0.60, log 5 = 0.69)
50 min
45 min
60 min
40 min
A chemical reaction is catalysed by a catalyst X. Hence, X
Reduces enthalpy of the reaction
Decreases rate constant of the reaction
Increases activation energy of the reaction
Does not affect equilibrium constant of the reaction
In the following reaction, how is the rate of appearance of the underlined product related to the rate of disappearance of the underlined reactant?
In a first order reaction A → B, if k is rate constant and initial concentration of the reactant A is 0.5 M, then the half-life is
The reaction A → B follows first order kinetics. The time taken for 0.8 mole of A to produce 0.6 mole of B is 1 h. What is the time taken for the conversion of 0.9 mole of A to 0.675 mole of B?
0.25 h
2 h
1 h
0.5 h
When a biochemical reaction is carried out in laboratory from outside of human body in the absence of enzyme, the rate of reaction obtained is 10-6 times, then activation energy of the reaction in the presence of enzyme is
6/RT
P is required
Different from Eα obtained in laboratory
Cannot say any things
For exothermic reaction, the energy of activation of the reactants is
Equal to the energy of activation of products
Less than the energy of activation of products.
Greater than the energy of activation of products.
Sometimes greater and sometimes less than that of the products.
For the reaction
2 A + B → 3C + D
Which of the following does not express the reaction rate?
The rate of reaction between two reactants A and B decreases by a factor of 4, if the concentration of reactant B is doubled. The order of this reaction with respect to reactant B is
-1
-2
1
2
