Embibe Experts Solutions for Chapter: Chemical Kinetics, Exercise 3: Exercise 3

Directions: Each of these questions contains an Assertion followed by a reason. Read them carefully and answer the question on the basis of the following options. You have to select the one that best describes the two statements.

Assertion: The rate of reaction whether exothermic or endothermic, increase with temperature.

Reason: The rate reaction $=\mathrm{K}[\mathrm{reactant}{]}^{\mathrm{n}}$ and $\mathrm{K}$ increases with temperature.

Directions: Each of these questions contains an Assertion followed by a reason. Read them carefully and answer the question on the basis of the following options. You have to select the one that best describes the two statements.

Assertion: A catalyst increases the rate of reaction by lowering the energy of activation.

Reason: The catalyst-reactant interaction forms an activated adsorbed complex and adsorption is always exothermic.

Directions: Each of these questions contains an Assertion followed by a reason. Read them carefully and answer the question on the basis of the following options. You have to select the one that best describes the two statements.

Assertion: The catalyst does not affect the heat of the reaction.

Reason: It increases the rate of reaction.

Directions: Each of these questions contains an Assertion followed by a reason. Read them carefully and answer the question on the basis of the following options. You have to select the one that best describes the two statements.

Assertion: The elementary reaction is a single-step reaction and does not possess a mechanism.

Reason: An elementary reaction has the order of reaction and molecularity same.

Directions: Each of these questions contains an Assertion followed by a reason. Read them carefully and answer the question on the basis of the following options. You have to select the one that best describes the two statements.

Assertion: For the reaction $2{\mathrm{O}}_3⟶3{\mathrm{O}}_2$,  the rate $=\mathrm{K}{\left[{\mathrm{O}}_3\right]}^2{\left[{\mathrm{O}}_2\right]}^{-1}$

Reason: The reaction has -ve order for ${\mathrm{O}}_2$.

Directions: Each of these questions contains an Assertion followed by a reason. Read them carefully and answer the question on the basis of the following options. You have to select the one that best describes the two statements.

Assertion: Order of reaction can never be fractional for an elementary reaction.

Reason: An elementary reaction takes place by a one-step mechanism.

Directions: Each of these questions contains an Assertion followed by a reason. Read them carefully and answer the question on the basis of the following options. You have to select the one that best describes the two statements.

Assertion: Every collision between molecules does not lead to a chemical reaction.

Reason: Only those molecules can react during collisions that acquire threshold energy levels.