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Dissociation is the breaking up of a complex compound into simple compounds.

Dissociation of PCl5:
PCl5 -------> PCl3 + Cl2
Dissociation of water:
H2O --------> OH + H
0 0 0
dissociation means splitting into simpler forms.
1) 2H2O gives rise to H2+O2
2) Ca(OH)2 gives rise to Cao+H2
2 5 2
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