Chemistry NCERT Exemplar Solutions Class 12th Chapter Four

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

A. The reaction has a zero order. The concentration of the reactants does not change with time in a zero order reaction, and the rate of concentration remains constant

B. Slope of the curve is  - k

C. The rate constant's units are molL  ¹s ^{- 1}

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

The concentration of the reactants does not change with time in a zero -order reaction, and the rate of concentration remains constant. The molecularity of a reaction cannot be 0 because it indicates the number of reactants involved.

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

When the Threshold energy is less than the energy of the molecules and the orientation of the molecules is proper for the effective collision, the reaction happens. As a result, the reaction is slow, and the number of effective collisions is reduced

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

The number of ions or atoms that collide to react is known as molecularity in an elementary reaction. The order of reaction about B should be 1 if this is an elementary reaction, however the rate law given is $\frac{3}{2}$

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

The concentration of the reactants does not change with time in a zero- order reaction, and the rate of concentration remains constant.

R= [R]₀ – Kt

Kt = [R]₀

t = $\frac{\left. [\mathrm{R}\right]{}_0}{\mathrm{K}}$

 

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

The concentration of the reactants does not change with time in a zero- order reaction, and the rate of concentration remains constant.

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 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 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