Chemistry NCERT Exemplar Solutions Class 12th Chapter Four

This is a Assertion and Reason Type as classified in NCERT Exemplar

Correct option: E

The claim is erroneous, but the reason is right, because the correct assertion is that effective collision leads to the production of a product, and the reason states that the conditions of collision theory must be met for the reaction to be completed.

This is a Assertion and Reason Type as classified in NCERT Exemplar

Correct option: A

Both the assertion and the reason are valid, and the reason is a correct  of the assertion since the enthalpy of reaction is the difference between the total enthalpy of the reactants and products in the presence of a catalys

This is a Assertion and Reason Type as classified in NCERT Exemplar

Correct option: E

The order and molecularity may or may not be the same, assertion is false, but reason is right. The sum of the power of the reactants is the order of reaction, which may be easily determined. The total of the stoichiometric coefficient of the rate-determining elementary step determines molecularity

This is a Assertion and Reason Type as classified in NCERT Exemplar

Correct option: B

Both assertion and reason are valid, but reason does not explain assertion because the order of reaction can be zero or even fractional because the order of reaction is proportional to the total of the power of the reactants.

 This is a Matching Type Question as classified in NCERT Exemplar

(i)- (b) ; (ii)- (c) ; (iii)- (a)

The rate of conversion in diamond is normally imperceptible.

Long-term rate at a moment's notice

The average rate is only for a short time.

This is a Matching Type Question as classified in NCERT Exemplar

(i)- (a) ; (ii)- (b) ; (iii)- (b); (iv)- (a)

 A zero-order reaction is one in which the reactant concentrations do not change over time and the rate of concentration remains constant.

A first-order reaction is one in which the rate of the reaction is linearly proportional to the concentration of only one ingredient. In other terms, a first-order reaction is a chemical reaction whose rate is determined by changes in only one of the reactants' concentration.

This is a Multiple Choice Questions as classified in NCERT Exemplar

Correct options: A and D

The pace of a reaction that is directly proportional to the concentration of the reacting substance is known as a first order reaction. 

Y=mn

k = $\frac{2.303}{\mathrm{t}}\mathrm{}$ log  $\frac{\mathbf{ }\mathbf{a}}{\mathbf{a}-\mathbf{x}\mathbf{ }}$

t = $\frac{2.303}{\mathrm{k}}\mathrm{}$ log $\frac{\mathbf{ }\mathbf{a}}{\mathbf{a}-\mathbf{x}\mathbf{ }}$

x= a- $\frac{\mathbf{a}}{2}$

x= $\frac{\mathbf{a}}{2}$

t $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.\mathbf{}$ _{= $\frac{2.303}{\mathrm{k}}\mathrm{}$} log $\frac{\mathbf{ }\mathbf{a}}{\mathbf{a}-\frac{\mathbf{a}}{2}\mathbf{ }}$   

$\frac{2.303}{\mathrm{k}}$ log2

= $\frac{0.693}{\mathrm{k}}$

This is a Multiple Choice Questions as classified in NCERT Exemplar

Correct options: A and D

A Zero order reaction = [R] =  ( - k)t +  [R]₀

y = (m *  ) + c

x = t (time)

y =  [R]concentration

Slope (m) =  - k

Intercept (c) =  [R]₀

  $\frac{\left. [\mathbf{R}\right]\mathbf{ }-\mathbf{ }{\left. [\mathbf{R}\right]}_0}{\mathbf{t}}$ =  - k

$\frac{\left. [\mathbf{R}\right]\mathbf{ }-\mathbf{ }{\left. [\mathbf{R}\right]}_0}{\mathbf{t}}$ =  - kt^o

Rate ∝ t⁰