For a given reaction the concentration of the reactant plotted against time gave a straight line with negative slope.
The order of the reaction will be:
1. 3
2. 2
3. 1
4. 0
The relationship between temperature and the variance in reaction rate is:
1. | 2. | ||
3. | 4. |
If a reaction A + B C is exothermic to the extent of 30 kJ/mol and the forward reaction has an activation energy of 70 kJ/mol, the activation energy for the reverse reaction will be:
1. 30 kJ/mol
2. 40kJ/mol
3. 70 kJ/mol
4. 100 kJ/mol
A first-order reaction takes 40 min for 30 % decomposition. The t1/2 for this reaction will be:
1. | 77.7 min | 2. | 27.2 min |
3. | 55.3 min | 4. | 67.3 min |
The half-life period for a first-order reaction is 20 minutes. The time required to change the concentration of the reactants from 0.08 M to 0.01 M will be:
1. | 20 minutes | 2. | 60 minutes |
3. | 40 minutes | 4. | 50 minutes |
The kinetic data for the reaction: 2A + B2 → 2AB are as given below
[A]/mol L-1 | [B2]/mol L-1 | Rate/mol L-1s-1 |
0.5 | 1.0 | 2.5 × 10-3 |
1.0 | 1.0 | 5.0 × 10-3 |
0.5 | 2.0 | 1 × 10-2 |
The order of reaction with respect to A and B2 is, respectively:
1. | 1 and 2 | 2. | 2 and 1 |
3. | 1 and 1 | 4. | 2 and 2 |
The rate constant, the activation energy, and the Arrhenius parameter of a chemical reaction at 25°C are 3.0×10-4 s-1, 104.4 kJ mol-1 and 6.0×1014s-1 respectively.
The value of the rate constant as T → ∞
will be:
1. 2.0 × 1018 s-1
2. 6.0 × 1014 s-1
3.
4. 3.6 × 1030 s-1
The gas phase decomposition 2N2O5 → 4NO2 + O2 follows the first order rate law, K = 7.5 × 10-3 sec-1. The initial pressure of N2O5is 0.1 atm. The time of decomposition of N2O5 so that the total pressure becomes 0.15 atm will be -
1. | 54 sec | 2. | 5.4 sec |
3. | 3.45 sec | 4. | 34.55 sec |
If in the fermentation of sugar in an enzymatic solution that is 0.12 M, the concentration of the sugar is reduced to 0.06 M in 10 h and to 0.03 M in 20 h, the order of the reaction will be:
1. 1
2. 2
3. 3
4. 0
In a first-order reaction A products, the concentration of the reactant decreases to 6.25 % of its initial value in 80 minutes. The value of the rate constant, if the initial concentration is 0.2 mole/litre, will be:
1.
2.
3.
4.