For a certain reaction a plot of [(c0-c)/c] against time t, yields a straight line. c0 and c are concentrations of reactant at t = 0 and t = t respectively. The order of reaction is:
1. 3
2. 0
3. 1
4. 2
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Hydrogenation of vegetable ghee at 250C reduces pressure of H2 from 2 atom to 1.2 atom in 50 minute. The rate of reaction in terms of molarity per second is:
1. 1.09 x 10-6
2. 1.09 x 10-5
3. 1.09 x 10-7
4. 1.09 x 10-8
Difficulty Level:
A hypothetical reaction, A2 +B2 2AB mechanism as given below;
A2 A+ A ............(Fast)
A+B2 → AB + B ............(Slow)
A+ B → AB ............(Fast)
The order of the overall reaction is:
1. 2
2. 1
3. 1.5
4. zero
Difficulty Level:
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]
Difficulty Level:
In gaseous reactions important for the understanding of the upper atmosphere H2O and O react bimolecularly to form two OH radicals. H for this reaction is 72kJ at 500 K and Ea is 77 kJ mol-1, then Ea for the bimolecular recombination of two OH radicals to form H2O and O is:
1. 3 kJ mol-1
2. 4 kJ mol-1
3. 5 kJ mol-1
4. 7 kJ mol-1
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For a reaction A Product, rate law is . The concentration of A left after time t when is:
1.
2.
3.
4.
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For an exothermic chemical process occurring in two steps as;
(i) A+BX(Slow)
(ii) XAB (Fast)
The progress of the reaction can be best described by:
1.
2.
3.
4. all of these
Difficulty Level:
For the non-stoichiometric reaction 2A + B C +D, the following kinetic data were obtained in three separate experiments, all at 298 K.
Initial Concentration (A) |
Initial Concentration (B) | Initial rate of formation of C (mol L-1 S-1) |
0.1 M | 0.1 M | |
0.1 M | 0.2 M | |
0.2 M | 0.1 M |
The rate law for the formation of C is:
1. d[C]/dt = k[ A][B]
2. d[C]/dt = k[ A]2[B]
3. d[C]/dt = k[ A][B]2
4. d[C]/dt = k[ A]
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For the reaction N2 + 3H2 2NH3, the rate d[NH3]/dt = 2x10-4 Ms-1 .Therefore, the rate -d[N2]/dt is given as:
1. 10-4 Ms-1
2. 104 Ms-1
3. 10-2 sM-1
4. 10-4 sM-1
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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
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