Second order reaction

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Second order reaction: 

In this reaction, the rate of the reaction depends upon the concentration of two reacting species. 

Example: 

(1) Decomposition of nitrogen peroxide 
2NO² --> 2NO + O², rate = K [NO²]²

(2) Reaction between H²(g) and I²(g) to from HI(g) H²(g) + I²(g) 2HI(g), rate =  k[H²] [I²] 

(3) Alkali hydrolysis of ester 
CH³COOC²H⁵ + NaOH--> CH³COONa + C²H⁵OH, rate = k[CH³COOC²H⁵] [NaOH].

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