Chemical Kinetics

This is a Multiple Choice Questions as classified in NCERT Exemplar

Correct options: A, C and D

The pressure in this reaction is extremely high, and it becomes independent of the ammonia concentration. The metal surface becomes saturated with gas molecules when the rate of reaction=Rate constant. The rate of a zero-order reaction is independent of the concentration of reactants in the reaction.

This is a Multiple Choice Questions as classified in NCERT Exemplar

Correct options: A and D

A complex reaction is one that does not happen in a single step.

The total number of molecules involved in the slowest step of the reaction determines the overall reaction rate.

Correct options: A and B

This is a Multiple Choice Questions as classified in NCERT Exemplar

Unimolecular reaction: Unimolecular means relating to a single molecular reaction that describes decomposition of a single reactant.

If product A→ (B)

rate = k [A]

Example Na₂O₄ (g)→2No₂ (g)

Order = 1

Molecularity = 1

The slowest step is the rate determining which determines the Order and Molecularity.

This is a Multiple Choice Questions as classified in NCERT Exemplar

Correct options: A and D 

Elementary reaction: It is a reaction that occurs in a single step.

Here we must understand about the Order and Molecularity.

Molecularity of a reaction = number of reacting species (collide to bring a chemical reaction).

Discussing about the Order, Rate law is used in Order and how do we equate shall be seen in the next step

rate = k [A] ^α [B] ^β

For a balanced chemical equation of an elementary reaction Order and Molecularity is same and can never be 0. 

This is a Multiple Choice Questions as classified in NCERT Exemplar

Correct options : A, C and D.

Rate law = Experimental rate of the reaction

Suppose aA + bB→cC + dD

Then rate = k [A] ^α [B] ^β

Here instead of using complex reaction we use elementary reaction which gets solved in one step

This is a Short Answer Type Question as classified in NCERT Exemplar

Incorrect order results from a balanced chemical equation. KClO₃ + 6FeSO₄ + 3H₂SO₄→KCl + 3H₂O + 3Fe₂ (SO₄)₃

This reaction is complex and occurs in several steps. The order is determined by the slowest in the reactions

This is a Short Answer Type Question as classified in NCERT Exemplar

Simple reactions occur in a single stage, whereas complicated reactions occur in multiple steps. Each phase in a multi-step process has its own molecularity, which is not added together. There is no molecularity in complex reactions. The sequence of a complex reaction is decided by the slowest step. As a result, it can be used for both simple and complex processes

This is a Short Answer Type Question as classified in NCERT Exemplar

The number of molecules of the reactants involved in an elementary reaction is referred to as the molecularity of the reaction. For this, a single molecule with a minimum molecularity of one is required, and it cannot be zero

This is a Short Answer Type Question as classified in NCERT Exemplar

At room temperature, the redox titration of  KMnO₄vs oxalic acid is exceedingly slow; nevertheless, as the temperature rises, so does the rate of reaction. At a temperature of 500c., KMnO₄ is acidified with dil H₂SO₄ and interacts with oxalic acid.

This is a Short Answer Type Question as classified in NCERT Exemplar

Thermodynamic feasibility is determined by ΔG factors. So, while the conversion of diamond to graphite is thermodynamically viable, the reaction is sluggish and has a high activation energy.

Gibb's free energy is ΔG
ΔG =Rtlnk

ΔG_{P, T $>$}  o

at constant pressure and temperature should be negative or less than 0.

For example, Diamond to be converted to Graphite

ΔG=−ve

It is theoretically conceivable, but the rate is extremely slow, and the activation energy is extremely high. The energy required to transform diamond to graphite is insufficient.