What is the rate and order of a reaction of the mechanism is
        2NO+H2N2+H2O2      (slow)

Following by H2O2+H2   2H2O   (fast)


The rate of reaction depend on the slowest step thus  
Rate = kNO2  H2

Order of reaction is  2+1 =3 
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Define first order reaction. What are its units?

The reaction in which rate of reaction is directly proportional to concentration of reactant i.e., sum of powers to which concentration terms are raised is equal to unity e.g., Rate = k[N2O5], where ‘k’ is rate constant and its unit is s–1.
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In some cases it is found that a large number of colliding molecules have energy more than threshold value, yet the reaction is slow. Why?


The colliding molecules may not be in proper orientation at the time of collision.
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Define the order of a reaction.

The order of a reaction is equal to the sum of the powers (exponents) to which the various concentration terms are raised in the rate law expression of the reaction.
Rate = k [A]x [B]y
order = x + y

for example 

Rate = k [A]1/2 [B]3/2 So order = 1/2 + 3/2 = 2, i.e., second order.

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Define second order reaction? Give one example and units of K.

The reaction in which sum of powers to which concentration terms are raised is equal to 2 in rate law e.g.,

CH3COOC2H5+NaOH                                             CH3COONa+C2H5OH
dxdt=k[CH3COOC2H5]1 [NaOH]

                            Units of k are L mol-1s-1.
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