How many letters does the top answer for “the group no2, usually called the nitro group.” have?

The most common answer is nitroxyl (8 letters).

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Crossword clue: the group no2, usually called the nitro group.

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

nitroxyl 8 letters web-def

The group NO2, usually called the nitro group.

Pattern

Data: SCOWL, igerman98, RLA-ES, Grammalecte, br.ispell · frequency: OpenSubtitles (see Data & licenses)