When the initial concentration of a reactant is doubled in a reaction, its half-life period is not affected. The order of the reaction will be:
1. 0
2. 1
3. 1.5
4. 2
The incorrect statement regarding the order of reaction is:
1. | Order is not influenced by the stoichiometric coefficient of the reactants. |
2. | Order of reaction is the sum of power to the concentration terms of reactants to express the rate of reaction. |
3. | The order of reaction is always a whole number. |
4. | Order can be determined by experiments only. |
For the reaction, \(\mathrm{N}_2+3 \mathrm{H}_2 \rightarrow 2 \mathrm{NH}_3,\) if, \(\frac{d[NH_{3}]}{dt} \ = \ 2\times 10^{-4} \ mol \ L^{-1} \ s^{-1}\), the value of \(\frac{-d[H_{2}]}{dt}\) would be:
1. | \(3 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1} \) | 2. | \(4 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1} \) |
3. | \(6 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1} \) | 4. | \(1 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}\) |
For the reaction, \(2 A+B \rightarrow 3 C+D\)
An incorrect expression for the rate of reaction is:
1. | \(-\frac{d[C]}{3} d t \) | 2. | \(-\frac{d[B]}{d t} \) |
3. | \(\frac{d[D]}{d t} \) | 4. | \(-\frac{d[A]}{2 d t}\) |
The mechanism of a hypothetical reaction
X2 + Y2 → 2XY is given below:
(i) X2 → X + X (Fast)
(ii) X + Y2 ⇄ XY + Y (slow)
(iii) X + Y → XY (Fast)
The overall order of the reaction will be:
1. 2
2. 0
3. 1.5
4. 1
If of a reaction is 100 kJ mol-1, then the activation energy for the forward reaction must be
1. Greater than 100 kJ mol-1
2. Less than 100 kJ mol-1
3. Equal to 100 kJ mol-1
4. None of the above.
At 400 K, the energy of activation of a reaction is decreased by 0.8 kcal in the presence of a catalyst. As a result, the rate will be:
1. | Increased by 2.71 times. | 2. | Increased by 1.18 times. |
3. | Decreased by 2.72 times. | 4. | Increased by 6.26 times. |
The following data were obtained during the first-order thermal decomposition of at a constant volume.
SO2Cl2(g) → SO2(g) + Cl2(g)
Experiment | Time/s | Total pressure/atm |
1 | 0 | 0.5 |
2 | 100 | 0.6 |
The rate of the reaction when total pressure is 0.65 atm will be:
1.
2.
3.
4.
The half-life for radioactive decay of is 5730 y. An archaeological artifact containing wood had only 80 % of the found in a living tree. The age of the sample will be:
1. 1657.3 y
2. 1845.4 y
3. 1512.4 y
4. 1413.1 y
The thermal decomposition of a compound is of first order. If 50 % of a sample of the compound decomposes in 120 minutes, how long will it take for 90 % of the compound to decompose?
1. 399 min
2. 410 min
3. 250 min
4. 120 min