Class 12th

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

Let order of reaction be = n

rate = k [A]ⁿ- (i)

27r = k [3A]ⁿ- (ii)

Divide (ii) by (i)

$\frac{27\mathbf{r}}{\mathbf{r}}$  =  $\frac{27\mathbf{r}}{\mathbf{r}}$   k [3A]nn

3ⁿ = 27

n = 3

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

Ans: E? _Cell can never be zero. For a feasible reaction E? _Cell should be positive or ΔrG$°$should be negative and at the stage of equilibrium, both of these parameters are zero.

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

The order and molecularity of elementary reactions are the same. As a result of a single collision between two molecules or ions, a complicated process occurs. A reaction mechanism is a set of elementary reactions.

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

Ans:No, the difference in potentials of the electrodes is measured. A reference electrode is to be taken while measuring the electrode potential of the electrode.

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

Experimentally, the reaction's rate law can be calculated.

Step 1

2NO (g) + O₂ (g)→2NO₂ (g)

O₂ (g) is taken in excess

x molecules of NO number reacting with excess of O₂

r = k [NO]^x

Step 2

2NO (g) + O₂ (g)→2NO₂ (g)

When 2No (g)is taken in excess

Y molecules of O₂ reacting with excess of [NO]

rate = k [O₂]^y

rate = k [NO]^x [NO]^y

This is a Long Answer Type Questions as classified in NCERT Exemplar

Ans: The relation between Gibbs free energy and the emf of the cell is as follows;

ΔG=−nFE_cell

 E $°$ _cell s the cell potential

is the standard emf of the cell

Maximum work obtained from the galvanic cell is nFE $°$ _.

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

Given: Order of the reaction = 0

We know that a zero order reaction is a chemical reaction that occurs regardless of the reactant's concentration.

The rate law of 2A + B→C is

r = k [A]⁰ [B]⁰

For a zero- order reaction

r = k

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

A bimolecular reaction occurs when two particles collide. The product of the concentrations of both elements determines the rate of reaction. If one of the reactants is taken in substantial excess in such a way that its concentration seldom changes, a bimolecular reaction can be kinetically first order.

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

Tell us about the pseudo-first-order reaction. It's the reaction with the highest true rate law, yet it behaves like a first order reaction, but it's more specifically a second order reaction.

As an example, consider the hydrolysis of an ester.

CH₃COOC₂CH₅ + H₂O→CH₃COOH + C₂H₅OH

rate = k [CH₃COOC₂H₅] [H₂O]… (constant)

k1 [CH₃COOC₂H₅]

k = k [H₂O]