identify and categorise the cations ,anions and polyatomic ions in the following compounds.
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(a) Na+ is cation
S^2- is anion
(b) Mg^2+ is cation
(OH)^-1 is anion
(c) Ca2+ is cation
(NO3)^-1 is anion
(d) Al3+ is cation
Cl- is anion
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