Selenous acid

Rarity: Uncommon

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Notion

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Science and technology

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What Wikipedia says

Selenous acid (or selenious acid) is the chemical compound with the formula H2SeO3. Structurally, it is more accurately described by O=Se(OH)2. It is the principal oxoacid of selenium; the other being selenic acid.

Excerpt from the Wikipedia article “Selenous acid”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Д.Ильин: vectorization, Public domain, via Wikimedia Commons.