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Chemical Kinetics

Short Answer Type

131. Identify, giving reasons, the faster reaction in the following:

2 Na (s) + I_{2} (s) \to 2 Nal (s)

2 Na (s) + I_{2} (g) \to 2 Nal (s)

141 Views

132. Identify, giving reasons, the faster reaction in the following:

C (s) + 2 H_{2} O (g) \to 2 H_{2} (g) + {CO}_{2} (g)

C (s) + 2 H_{2} O (s) \overset{Catalyst}{\to} 2 H_{2} (g) + {CO}_{2} (g)

118 Views

133. Identify, giving reasons, the faster reaction in
the following:

C (s) + 1 / 2 O_{2} (g) \overset{500 °}{\to} CO (g) C (s) + 1 / 2 O_{2} (g) \overset{1000 °}{\to} CO (g)

121 Views

134. Identify, giving reasons, the faster reaction in the following:

N_{2} (10 atm) + 3 H_{2} (10 atm) \to 2 {NH}_{3} (g) N_{2} (5 atm) + 3 H_{2} (5 atm) \to 2 {NH}_{3} (g)

131 Views

135. What is the difference between order and molecularity of a reaction?

871 Views

Long Answer Type

136. What are Pseudo chemical reaction? Give examples.

558 Views

Short Answer Type

137. A reaction is first order in A and second order in B.
(i) Write differential rate equation.
(ii) How is the rate affected if the concentration of B is tripled?
(iii) How is the rate affected when the concentrations of both A and B are doubled?
What is the significance of rate constant in the rate expression?

A reaction is first order in A and second order in B.

(i) $Rate = k {[A]}^{1} {[B]}^{2}$

$(ii) r_{0} = k {[A]}^{1} {[B]}^{2} r_{1} = k {[A]}^{1} {[3 B]}^{2} ∴ r_{1} = 9 \times r_{0}$

$(iii) r_{0} = k {[A]}^{1} {[B]}^{2} r_{2} = k {[2 A]}^{1} {[2 B]}^{2} ∴ r_{2} = 8 \times r_{0}$

Rate constant of a reaction is equal to the rate of reaction when concentration of each of the reactant is unity.

120 Views

138. Following reaction takes place in one step:

2 NO (g) + O_{2} (g) ⇋ 2 {NO}_{2} (g)

How will the rate of the above reaction change if the volume of the reaction vessel is diminished to one third of its original volume? Will there be any change in the order of the reaction with the reduced volume ?

1416 Views

139. Two similar reactions have the same rate constant at 25°C, but at 35°C one of the reaction has a higher rate constant than the other. Account for these observations.

129 Views

Long Answer Type

140. How will you verify whether a reaction is first order or not?

129 Views