If 60% of a first order reaction was completed in 60 min,50% of the same reaction would be completed in approximately.
50 min
45 min
60 min
40 min
The reaction follows first order kinetics. The time taken for 0.8 mole of A to produce 0.6 mole of B 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
1 h
0.5 h
1.732
3
1.02 x 10-4
3.4 x 105
3 x 10-4 mol L1s1
4 x 10-4 mol L1s1
6 x 10-4 mol L1s1
1 x 10-4 mol L1s1
For exothermic reaction, the energy of activation is.
Equal to the energy of activation of products.
Less than the energy of activation of product.
Greater than the energy of activation of products.
sometimes greater and sometimes less than that of the products.
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.
A substance 'A' decomposes by a first order reaction starting initially with [A]=2.00 m and after 200 min,[A] becomes 0.15 m.For this reaction t1/2 is.
53.49 min
50.49 min
48.45 min
46.45 min
Activation energy of a chemical reaction can be determined by.
Evaluating rate constant at standard temperature.
Evaluating velocities of reaction at two different temperatures.
Evaluating rate constants at two different temperatures.
Changing concentration of reactants.
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.
P is required.
Different from Ea obtained in laboratory
Cannot say any things
