Question
Tue May 01, 2012 By:
 

explain briefly about combination reaction,decomposition reaction,displacement reaction&double displacement reaction with proper definition and examples...!!

Expert Reply
Tue May 01, 2012
A combination reaction is a reaction in which two substances combine to form a third substance. A simple example would be where two elements react to form a compound of the elements. A good example of this would be:

2Na(s) + Cl2(g) ?2NaCl(s)
A decomposition reaction is a reaction in which a single compound reacts to give two or more substances. In order to decompose a compound, it is often necessary to raise the temperature.
A displacement reaction is that Chemical reaction in which a less reactive element is replaced in a compound by a more reactive one.
Double displacement reaction  is a reaction in which the positive and negative ions of two substances in a solution are mutually interchanged.
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