What is <Gmelin number> of <sulfate ion> ?
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Which is Gmelin number for sulfate ion?
SELECT DISTINCT ?k WHERE { resource:sulfate_ion property:Gmelin_number ?k }
select distinct ?answer where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q172290> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1578> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?answer. }
select distinct ?answer where { wd:Q172290 wdt:P1578 ?answer}
2120