Question: What is the safety classification and labelling of sodium hydroxide that is NFPA Health rating 2?
Paraphrase: For sodium hydroxide, which has NFPA Health rating 2, what is the safety classification and labeling?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q102769 p:P4952 ?s . ?s ps:P4952 ?obj . ?s pq:P993 ?x filter(contains(?x , '2')) }