Selenate
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The selenate ion is SeO42−.
Selenates are analogous to sulfates and have similar chemistry. They are highly soluble in aqueous solutions at ambient temperatures.
Unlike sulfate, selenate is a somewhat good oxidizer; it can be reduced to selenite or selenium.
In strongly acid conditions, hydrogen selenate ion, HSeO4−, is formed; the selenic acid, H2SeO4, is very strong.
See category for a list.