For a general reaction A B, the plot of the concentration of A vs. time is given in the figure.
The slope of the curve will be:
1. | -k | 2. | -k/2 |
3. | -k2 | 4. | -k/3 |
A first-order reaction takes 40 min for 30 % decomposition. The half life of the reaction will be:
1. | 88.8 min | 2. | 94.3 min |
3. | 67.2 min | 4. | 77.7 min |
The rate constant for the decomposition of hydrocarbons is 2.418 × 10–5 s–1 at 546 K. If the energy of activation is 179.9 kJ/mol, the value of the pre-exponential factor will be:
For a reaction A → Product, with k = 2.0 × 10–2 s–1, if the initial concentration of A is 1.0 mol L-1, the concentration of A after 100 seconds would be :
1. | 0.23 mol L-1 | 2. | 0.18 mol L-1 |
3. | 0.11 mol L-1 | 4. | 0.13 mol L-1 |
The decomposition of sucrose follows the first-order rate law. For this decomposition, t1/2 is 3.00 hours. The fraction of a sample of sucrose that remains after 8 hours would be:
1. | 0.13 | 2. | 0.42 |
3. | 0.16 | 4. | 0.25 |
The decomposition of hydrocarbons follows the equation: k = (4.5 × 1011s–1) e-28000K/T
The activation energy (Ea) for the reaction would be:
1. | 232.79 kJ mol-1 | 2. | 245.86 kJ mol-1 |
3. | 126.12 kJ mol-1 | 4. | 242.51 kJ mol-1 |
The rate constant for the first-order decomposition of H2O2 is given by the equation: \(log \ k \ = \ 14.34 \ - \ 1.25 \ \times \ 10^{4}\frac{K}{T}\). The value of Ea for the reaction would be:
1. 249.34 kJ mol-1
2. 242.64 J mol-1
3. -275.68 kJ mol-1
4. 239.34 kJ mol-1
1. Pseudo-first-order reaction
2. First-order reaction
3. Second order reaction
4. Third-order reaction
The rate constant for a first-order reaction is . The time required to reduce 2.0 g of the reactant to 0.2 g will be:
1. | 200 s | 2. | 500 s |
3. | 1000 s | 4. | 100 s |
An increase in the concentration of the reactants of a reaction leads to a change in:
1. | Heat of reaction | 2. | Threshold energy |
3. | Collision frequency | 4. | Activation energy |