The term "Pyro" use for those oxy acid which are formed by removal of one water molecule from two molecules of same oxy acid and resulting product is also an oxy acid then the product acid is named with prefix "Pyro"
For
Examples:
H3BO3
(√), H2CO3 (√), H4SiO4 (√), HNO3 (×), HPO3 (√), HPO4 (√), H2SO4 (√), HCl4 (×)
(×) "Pyro" form not possible.
(√) "Pyro" form possible.
(1) In general those oxy
acids are formed “pyro” acid which contains atleast
two hydrogen atoms.
(2) In general all the “pyro” oxy acids contain
oxy-linkage except "pyro sulphurous acid"
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