Q. No.In the presence of a catalyst, the heat evolved or absorbed during the reaction:
1.
Increases.
2.
Decreases.
3.
Remains unchanged.
4.
May increase or decrease.
| 1. | Determining the rate constant at standard temperature. |
| 2. | Determining the rate constant at two temperatures. |
| 3. | Determining probability of collision. |
| 4. | Using the catalyst. |
The correct statement based on the graph below is:
| 1. | The activation energy of the forward reaction is E1 + E2 and the product is less stable than reactant. |
| 2. | The activation energy of the forward reaction is E1 + E2 and the product is more stable than the reactant. |
| 3. | The activation energy of both forward and backward reaction is E1 + E2 and reactant is more stable than the product. |
| 4. | The activation energy of the backward reaction is E1 and the product is more stable than reactant. |
Consider the first-order gas-phase decomposition reaction given below.
A(g) → B(g) + C(g)
The initial pressure of the system before the decomposition of A was . After the lapse of time t, the total pressure of the system increased by X units and became . The rate constant k for the reaction is:
| 1. | 2. | ||
| 3. | 4. |
Consider the Arrhenius equation given below and choose the correct option:
| 1. | Rate constant increases exponentially with increasing activation energy and decreasing temperature. |
| 2. | Rate constant decreases exponentially with increasing activation energy and increasing temperature. |
| 3. | Rate constant increases exponentially with decreasing activation energy and decreasing temperature. |
| 4. | Rate constant increases exponentially with decreasing activation energy and increasing temperature. |
A graph of volume of hydrogen released vs time for the reaction between zinc and dil. HCl is given in the graph below.
The correct statement among the following based on the graph given above is:
Which of the following statements is not correct about the order of a reaction?
| 1. | The order of a reaction can be a fractional number |
| 2. | Order of a reaction is experimentally determined quantity |
| 3. | The order of a reaction is always equal to the sum of the stoichiometric coefficients of reactants in the balanced chemical equation for a reaction |
| 4. | The order of a reaction is the sum of the powers of the molar concentration of the reactants in the rate law expression |
Consider the graph given in the figure. Which of the following options does not show an instantaneous rate of reaction in the 40s?
1. \({V_5 -V_2 \over 50-30}\)
2. \({V_4 -V_2 \over 50-30}\)
3. \({V_3 -V_2 \over 40-30}\)
4. \({V_3 -V_1 \over 40-20}\)
True statement among the following is:
| 1. | The rate of a reaction decreases with the passage of time as the concentration of reactants decreases. |
| 2. | The rate of a reaction is the same at any time during the reaction. |
| 3. | The rate of a reaction is independent of temperature change. |
| 4. | The rate of a reaction decreases with an increase in the concentration of the reactants. |
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