\(C(s) + 2 H_2(g) \rightarrow CH_4(g); \Delta H = -74.8~kJ mol^{-1}\) Which of the following diagrams gives an accurate representation of the above reaction? [R→reactants; P→products]
Question 2.
The rate of a reaction quadruples when temperature changes from 27°C to 57°C. Calculate the energy of activation.
Given R = 8.314 J K–1 mol–1, log 4 = 0.6021
1.
380.4 kJ/mol
2.
3.80 kJ/mol
3.
3804 kJ/mol
4.
38.04 kJ/mol
Question 3.
Activation energy of any chemical reaction can be calculated if one knows the value of:
Question 4.
Effective collisions are known to possess:
A: Energy greater than threshold energy. B: Breaking of old bond in reactant. C: Formation of new bond in product. D: High activation energy. E: Proper orientation.
Choose the correct answer from the options given below:
Question 5.
Rate constants of a reaction at 500 K and 700 K are 0.04 \(s^{-1}\) and 0.14 \(s^{-1}\), respectively; then, activation energy of the reaction is:
(Given : log 3.5 = 0.5441, R = 8.31 J \(K^{-1} \)\(\mathrm {mol}^{-1}\))
Question 6.
Which of the following plot represents the variation of \(ln ~k\) versus \(\frac 1{T}\) according to the Arrhenius equation?
Question 7.
The plot of ln k vs \({1 \over T}\) for the following reaction \(2N_2O_5(g) \rightarrow 4NO_2 (g) + O_2(g) \) gives a straight line with the slope of the line equal to \(-1.0 \times 10^4 K \).
The activation energy for the reaction in J mol–1 is:
(Given R = 8.3 J K–1 mol–1)
Question 8.
For a reaction AB, enthalpy of reaction is and enthalpy of activation is . The correct potential energy profile for the reaction is:
Question 9.
The slope of Arrhenius Plot (ln k v/s ) of the first-order reaction is . The value of Ea of the reaction is: [Given R = 8.314 JK–1 mol–1]
Question 10.
An increase in the concentration of the reactants of a reaction leads to a change in:
Great Job! continue working on more practice questions?
Question 1.
What does ZAB represent in the collision theory of chemical reactions?
Question 2.
For a reaction, activation energy and the rate constant at 200 K is 1.6 . The rate constant at 400K will be [Given that gas constant, R=8.314 J ]
Question 3.
What is the activation energy for a reaction if its rate doubles when the temperature is raised from 20oC to 35oC? (R = 8.314 J mol–1 K–1)
1.
269 kJ mol–1
2.
34.7 kJ mol–1
3.
15.1 kJ mol–1
4.
342 kJ mol–1
Question 4.
A reaction having equal energies of activation for forward and reverse reaction has:
Question 5.
For an endothermic reaction, the energy of activation is Ea, and the enthalpy of reaction is ΔH (both of these in kJ/mol). The minimum value of Ea will be:
Question 6.
The rate constants k1 and k2 for two different reactions are 1016. e-2000/T and 1015. e-1000/T, respectively. The temperature at which k1= k2 is:
Question 7.
The activation energy for a simple chemical reaction A → B is Ea in a forward direction. The activation energy for the reverse reaction:
Question 8.
The temperature dependence of the rate constant (k) of a chemical reaction is written in terms of the Arrhenius equation,
k = A.e–E*/RT. The activation energy (E*) of the reaction can be calculated by plotting:
Question 9.
When a biochemical reaction is carried out in a laboratory outside the human body in the absence of an enzyme, then the rate of reaction obtained is times. The activation energy of a reaction in the presence of an enzyme is:
Other Topics of that Section
d-Block Elements- Properties & Uses Practice Test Questions with Solutions Attempt Now
Alcohols: Preparation & Properties Practice Test Questions with Solutions Attempt Now
First Order Reaction Kinetics Practice Test Questions with Solutions Attempt Now
Alkanes, Alkenes and Alkynes - Chemical Properties Practice Test Questions with Solutions Attempt Now
M.O.T Practice Test Questions with Solutions Attempt Now
Hybridisation Practice Test Questions with Solutions Attempt Now
Kp, Kc & Factors Affecting them Practice Test Questions with Solutions Attempt Now
Aliphatic Hydrocarbon Practice Test Questions with Solutions Attempt Now
Aromatic Hydrocarbons Practice Test Questions with Solutions Attempt Now
Moles, Atoms & Electrons Practice Test Questions with Solutions Attempt Now
Definition, Rate Constant, Rate Law Practice Test Questions with Solutions Attempt Now
Concentration Based Problem Practice Test Questions with Solutions Attempt Now
Solubility Product Practice Test Questions with Solutions Attempt Now
Ionization Energy (IE) Practice Test Questions with Solutions Attempt Now
f-Block Elements- Properties & Uses Practice Test Questions with Solutions Attempt Now
pH calculation Practice Test Questions with Solutions Attempt Now
Nomenclature Practice Test Questions with Solutions Attempt Now
First Law of Thermodynamics Practice Test Questions with Solutions Attempt Now
Phenols: Preparation & Properties Practice Test Questions with Solutions Attempt Now
Polarity Practice Test Questions with Solutions Attempt Now
V.S.E.P.R & V.B.T Practice Test Questions with Solutions Attempt Now
Order, Molecularity and Mechanism Practice Test Questions with Solutions Attempt Now
Thermochemistry Practice Test Questions with Solutions Attempt Now
Gibbs Energy Change Practice Test Questions with Solutions Attempt Now
Enthalpy & Internal energy Practice Test Questions with Solutions Attempt Now
Atomic Size Practice Test Questions with Solutions Attempt Now
Spontaneity & Entropy Practice Test Questions with Solutions Attempt Now
Acids & Bases - Definitions & Classification Practice Test Questions with Solutions Attempt Now
Electron Displacement Effects Practice Test Questions with Solutions Attempt Now
Oxidizing & Reducing Agents Practice Test Questions with Solutions Attempt Now
Attempt Now
