Q. No.Rate law expression cannot be determined from a balanced chemical equation if.
(a)
The reverse reaction is involved.
(b)
It is an elementary reaction.
(c)
It is a sequence of elementary reactions.
(d)
Any of the reactants is in excess.
The correct choice among the given is:
1. (a, b and c)
2. (b, c and d)
3. (a, c and d)
4. (a, b and d)
The correct statements among the following regarding a balanced chemical equation of an elementary reaction are-
| a. | Order is the same as molecularity. |
| b. | Order is less than the molecularity. |
| c. | Order is greater than molecularity. |
| d. | Molecularity can never be zero. |
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
The correct statements among the following regarding any unimolecular reaction are-
| (a) | Only one reacting species is involved in the rate-determining step |
| (b) | The order and the molecularity of the slowest step are equal to one |
| (c) | The molecularity of the reaction is one and the order is zero |
| (d) | Both molecularity and order of the reaction are one |
| 1. | (a, b) | 2. | (b, c) |
| 3. | (c, d) | 4. | (a, d) |
The correct statements among the following regarding a complex reaction are-
| (a) | Order of the overall reaction is the same as the molecularity of the slowest step. |
| (b) | Order of the overall reaction is less than the molecularity of the slowest step. |
| (c) | Order of the overall reaction is greater than the molecularity of the slowest step. |
| (d) | The molecularity of the slowest step is never zero or non-integer. |
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
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) |
During decomposition of an activated complex
| (a) | Energy is always released. |
| (b) | Energy is always absorbed. |
| (c) | Energy does not change. |
| (d) | Reactants may be formed. |
The correct choice among the given is -
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
The correct statements among following about Maxwell, Boltzmann distribution of energy is -
| (a) | The fraction of molecules with the most probable kinetic energy decreases at higher temperatures |
| (b) | The fraction of molecules with the most probable kinetic energy increases at higher temperatures |
| (c) | Most probable kinetic energy increases at higher temperatures |
| (d) | Most probable kinetic energy decreases at higher temperatures |
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)
The correct statements among the following regarding Maxwell, Boltzmann distribution curve of energy is -
| a. | The area under the curve must not change with an increase in temperature. |
| b. | The area under the curve increases with increase in temperature. |
| c. | Area under the curve decreases with increase in temperature. |
| d. | With an increase in temperature curve broadens and shifts to the right-hand side. |
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
The correct statements among the following regarding the Arrhenius equation is/are -
| (a) | Rate of a reaction increases with an increase in temperature |
| (b) | Rate of a reaction increases with a decrease in activation energy |
| (c) | Rate constant decreases exponentially with an increase in temperature |
| (d) | Rate of reaction decreases with a decrease in activation energy |
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
The correct statements among the following is:
| (a) | Catalyst provides an alternative pathway to the reaction mechanism |
| (b) | Catalyst raises the activation energy |
| (c) | A catalyst lowers the activation energy |
| (d) | Catalyst alters enthalpy change of the reaction |
| 1. | (a, b) | 2. | (b, c) |
| 3. | (c, d) | 4. | (a, c) |
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