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What is chemical equilibrium?
The equilibrium between two chemical species present in the same or different phases is called chemical equilibrium .
 The chemical equilibrium are classified as homogenous and heterogeneous depending upon whether the reaction involves   only one phase or or more than  one phases respectively .
Characteristics of chemical equilibrium
 (i) A chemical equilibrium can be established only in closed systems..
 (ii) Chemical equilibrium can be attained from either end of a reversible reaction .
 (iii) Chemical equilibrium does not change with time ,so long as the external factors remain the same .
 (iv)Chemical equilibrium is a dynamic equilibrium.


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