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 Multiple Choice QuestionsShort Answer Type

91. Write the rate of reaction for the following reactions in terms of the concentration of reactants and products
(i) 2H2O→ 2HO + O2
(ii) 2NO + O2 → 2NO2
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92.

Nitric Oxide. NO reacts with oxygen to produce nitrogen dioxide.
2NO(g) + O2(g) → 2NO2(g)
The rate law for this reaction is
rate = k[NO]2 [O2]
Propose a mechanism for the above reaction.

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93. State the role of activated complex in a reaction and state its relation with activation energy?


Activated complex is the intermediate compound formed by reactants, which is highly unstable and readily changes into product. Those reactants which possess activation energy and collide in proper orientation can form activated complex which can easily form products.
Lower the activation energy, more easily activated complex will be formed and faster will be the reaction.
Activation energy = energy of activated complex - energy of reactants.

Activated complex is the intermediate compound formed by reactants, w

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94. For the reaction:
2NO(g)+ O2(g) → 2NO2(g)
the rate law is
Rate = k[NO]2. Why does the rate law not include the concentration of O2?

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95.

The rate of reaction
2NO + Cl2 → 2NOCl
is double when concentration of Cl2 is doubled and it becomes 8 times when concentrations of both NO and Cl2 are doubled. Deduce the order of this reaction.

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96. Define ‘energy of activation’ of a reaction. How does it vary with a rise in temperature?
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 Multiple Choice QuestionsLong Answer Type

97. State and explain Arrehenius equation. How can we determine the activation energy of a reaction using this equation?
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98. What are Photo-chemical reactions? Describe the mechanism of reaction between hydrogen gas and chlorine gas when exposed to sunlight?
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 Multiple Choice QuestionsShort Answer Type

99. From the potential energy diagram show that: ΔE = over all energy change for the forward reaction: Ea1 – Ea2; where Ea1 = Activation energy for the forward process and Ea2 = Activation energy for the reverse process?

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100. The form of the rate law for a reaction is expressed as: rate = k [Cl2] [NO]2. Find out the orders of reaction with respect to Cl2 and with respect to NO and also the overall order of the reaction.
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