Following mechanism has been proposed for a reaction,
2A+B D+E
A+B C+D ...(Slow)
A+ C E ...(Fast)
The rate law expression for the reaction is:
1. r = K[A]2[B]
2. r=K[A][B]
3. r= K[A]2
4. r= K[A][C]
For the reaction N2 + 3H2 2NH3, the rate = 2 x 10-4 M s-1 .Therefore, the rate is given as:
1. 10-4 Ms-1
2. 104 Ms-1
3. 10-2 sM-1
4. 10-4 sM-1
If 'I' is the intensity of absorbed light and 'c' is the concentration of AB for the photochemical process AB + hv→ AB *, the rate of formation of AB * is directly proportional to:
1. c
2. I
3. I2
4. cI
When ethyl acetate was hydrolysed in pressure of 0.1 N HCl, the rate constant was found to be 5.40 x 10-5 sec-1 . But when 0.1 N H2SO4 was used for hydrolysis, the rate constant was found to be 6.25 X10-5sec-1. Thus, it may be concluded that:
1. H2SO4 is stronger than HCI
2. H2SO4 is weaker than HCl
3. H2SO4 and HCl both have the same strength
4. The data are not sufficient to compare the strength of H2SO4 and HCI
The chemical reaction, 2O3 3O2 proceeds as follows;
O3 O2 + O .....(Fast)
O+O3 2O2 ....(Slow)
The rate law expression should be:
1. r = K[O3]2
2. r = K[O3]2[O2]-1
3. r = K[O3][O2]
4. unpredictable
The rate of reaction becomes 2 times for every 10°C rise in temperature. How the rate of reaction will increase when temperature is increased from 30°C to 80°C?
1. 16
2. 32
3. 64
4. 128
For the reaction 2NO2 + F2 → 2NO2F, following
mechanism has been provided,
NO2 + F2 NO2F+F
NO2 + F NO2F
Thus, rate expression of the above
reaction can be written as:
1. r = K[NO2]2[F2]
2. r = K[NO2 ][F2]
3. r = K[NO2]
4. r = K[F2]
For the reaction:
[Cu(NH3)4]2+ + H2O[Cu(NH3)3H2O]2+ + NH3
the net rate of reaction at any time is given by, net rate =
2.0x10-4 [Cu(NH3)4]2+[H2O] - 3.0x105 [Cu(NH3 )3 H20]2+[NH3]
Then correct statement is/are :
1. rate constant for forward reaction = 2 x 10-4
2. rate constant for backward reaction = 3 x 105
3. equilibrium constant for the reaction = 6.6 x 10-10
4. all of the above
Consider the chemical reaction,
The rate of this reaction can be expressed in terms of time derivative of concentration of and .
The correct relationship amongest the rate expressions is:
(1) Rate
(2) Rate
(3) Rate
(4) Rate
Select the intermediate in the following reaction mechanism:
O3(g) O2(g) +O(g)
O(g) +O3(g) 2O2(g)
1. O3(g)
2. O(g)
3. O2(g)
4. none of these