water helps in separation of oppositely charged ions from their ionic bond give reason

The solution is as follows:

The lattice energy that keeps the opposite charges together is overcome by hydration energy. For example, when NaCl is dissolved in water, the ions Na+ and Cl- get hydrated in which energy is released. This energy compensates the lattice energy required to break the bond. 

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 ionic compounds like common salt is soluble  in water. NA ions and CL ions are now free to move in water and hence the solution conduct electricity.
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