For a first order reaction the reaction rate at reactant concentration of 0.01 M is found to be
2.0 x 10-5,mol L-1 s-1. The half-life period of the reaction is.
220 s
30 s
300 s
347 s
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
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
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.
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 rate of first order reaction is 1.5 x 10-2 mol L-1 min-1 at 0.5 M concentration of the reactant. The half-life of the reaction is.
0.383 min
23.1min
8.73 min
7.53 min
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.
In a reversible reaction,the energy of activation of the forward reaction is 50 kcal. The energy of activation for the reverse reaction will be.
< 50 kcal
50 kcal
Either greater than or less than 50 kcal.
> 50 kcal
