What information can we had from the statement that the energy of activation of a reaction is zero?

If the activation energy of a reaction is zero, then the reaction is instantaneous. It is very, very fast reaction. All reactant molecules are able to cross the energy barrier.
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Define collision frequency factor.

The collision frequency factor is defined as the number of collisions between the reactant molecules A and B per unit volume per unit time divided by the NA and Nb, the number of molecules per unit of A and B respectively. It is denoted by zAB.

 

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Define the term ‘order of reaction’ for chemical reactions. 

The sum of powers of the concentration of the reactants in the rate law expression is called the order of that chemical reaction.
Order of a reaction can be 0, 1, 2, 3 and even a fraction. 

For example for a reaction 

Rate = k [A]x [B]y
order = x + y

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Which of the reactions slow or fast, will have higher activation energy?

Slow reactions will have high energy of activation than the fast reactions.
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For the reaction H2 + I2 → 2HI, What is the molecularity of the reaction?


In the reaction H2 + I2 → 2HI the molecularity is two.
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