The right verb is speak while talk is used for short duration of time the difference between speak and talk is in duration

@Mohamed - "in" is required for the common case of speaking/talking about a topic in a language.

The Oxford Learner's Dictionaries are an excellent resource. https://www.oxfordlearnersdictionaries.com/definition/english/ The basic patterns are to speak (a language) to speak (to/with someone) (about something/someone) (in a language) to talk (to/with someone) (about something/someone) (in a language) speak https://www.oxfordlearnersdictionaries.com/definition/english/speak_1?q=speak meaning 4 ​[transitive] (not used in the progressive tenses) speak something to be able to use a particular language to speak several languages to speak a little Urdu Do you speak English? meaning 5 ​[transitive, intransitive] to use a particular language to express yourself speak something What language is it they're speaking? speak in something Would you prefer it if we spoke in German?

You don’t need to use in in the question keep it simple and straightforward