Q. No.The incorrect statement among the following is:
| 1. | The value of the equilibrium constant is changed in the presence of a catalyst in the reaction at equilibrium |
| 2. | Enzymes catalyse mainly bio-chemical reactions |
| 3. | Coenzymes increase the catalytic activity of the enzyme |
| 4. | The catalyst does not initiate any reaction |
\(2 \mathrm{C}_2 \mathrm{H}_6(\mathrm{g})+7 \mathrm{O}_2(\mathrm{g}) \rightarrow 4 \mathrm{CO}_2(\mathrm{g})+6 \mathrm{H}_2 \mathrm{O}(l) \),
the rate of disappearance of \(C_2H_6 (g)\):
| 1. | equals the rate of disappearance of \(O_2 (g)\) |
| 2. | is seven times the rate of disappearance of \(O_2 (g)\) |
| 3. | is twice the rate of appearance of \(CO_2 (g)\) |
| 4. | is one-third the rate of appearance of \(H_2O(l)\) |
How is the slope of the graph related to \(E_a\)?
1. \(E_a = \text {slope} \times 8.314 ~J ~mol^{-1} ~K^{-1}\)
2. \(E_a =- \text {slope} \times 8.314 ~J ~mol^{-1} ~K^{-1}\)
3. \(1/E_a = \text {slope} \times 8.314 ~J ~mol^{-1} ~K^{-1}\)
4. \(1/E_a = -\text {slope} \times 8.314 ~J ~mol^{-1} ~K^{-1}\)
The rate constant of the given reaction-
R(g) \(\xrightarrow[]{\Delta }\) 2P(g) is 2.48 × 10–4 s–1.
A 1 : 1 molar ratio of R to P in the reaction mixture is attained after:
1. 32 min
2. 27.3 min
3. 20 min
4. 0 min
For a zero-order reaction, the initial amount of reaction is 20 g and half-life is 30 minutes. The amount of reactant left after 60 minutes would be:
1. 5 g
2. 10 g
3. 2.5 g
4. Zero
The rate constant of a reaction is
3 x 10-3 mol-2 L2s-1. Hence, the order is:
1. 1
2. Zero
3. 2
4. 3
A reaction having equal energies of activation for forward and reverse reaction has:
1. ΔG = 0
2. ΔH = 0
3. ΔH = ΔG = ΔS = 0
4. ΔS = 0
If 60% of a first-order reaction was completed in 60 min, 50% of the same reaction would be completed in approximately:
(log 4 = 0.60, log 5 = 0.69)
| 1. | 50 min | 2. | 45 min |
| 3. | 60 min | 4. | 40 min |
The half-life of a certain enzyme catalysed reaction is 138 s, that follow the 1st order kinetics. The time required for the concentration of the substance to fall from 1.28 mg L–1 to 0.04 mg L–1, is:
1. 276 s
2. 414 s
3. 552 s
4. 690 s
At high pressure the following reaction is zero order-
The correct statements among the following is:
| (a) | Rate of reaction = Rate constant |
| (b) | Rate of the reaction depends on the concentration of ammonia |
| (c) | Rate of decomposition of ammonia will remain constant until ammonia disappears completely |
| (d) | Further increase in pressure will change the rate of reaction |
| 1. | (a, b, c) | 2. | (b, c, d) |
| 3. | (a, c, d) | 4. | (a, b, d) |
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