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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)

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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)

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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)

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

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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?

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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 ?

The below reaction take place in one step, thus rate of reaction is

2 NO (g) + O_{2} (g) ⇌ 2 {NO}_{2} (g)

Rate = k {[NO]}^{2} [O_{2}]

Suppose x moles of NO and Y moles of O₂ are taken in the vessle of volume V litre, then

r_{1} = k {[\frac{x}{V}]}^{2} [\frac{y}{V}]

If the volume of vessel is reduced to V/3, then for the same moles of NO₂ and O₂

_{$r_{2} = k {[\frac{x}{V / 3}]}^{2} {[\frac{y}{V / 3}]}^{2} = 27 k {[\frac{y}{V}]}^{2} [\frac{y}{V}]$

$∴$ $\frac{r_{2}}{r_{1}} = 27 or r_{2} = 27 r_{1}$}The rate of the reaction becomes 27 times the initial rate. Order of reaction remains unaffected.

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