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What are "Ortho" or "Meta" oxyacids?

We know that only non metal of P-block formed oxy acids except some metals. The simple way to distinguish between ortho oxy acids and Meta oxy acid is that after removal of a water molecule from a parental oxy acid, remain an oxy acid obtained as product then parental oxy acid named with prefix "Ortho" and product named with a prefix "Para". For Naming as ortho acid, that acid should contain minimum three hydrogen atoms.
For Examples:
H3BO3 (), H2CO3 (×), H4SiO4 (), HNO3 (×), H3PO3 (), H3PO4 (), H2SO4 (×), HCl4 (×)
(×) Ortho prefix will not used.
() Ortho prefix will used.

Meta acids and their salts always exist in dimeric, trimeric, tetrameric or in polymeric form, not in monomeric form.

[The tendency of polymerisation is observed as SiO4 4- > PO4 3- > SO4 2- > ClO4 -]

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