The interrogative pronouns in Nassian are:  kö "who", ce "what", ak- "what king of, how", k- "which". Pronouns ak- and k- are inflected as demonstrative pronouns. They also have also nominative forms with infix -en-, when it comes to choose between alternatives/antagonists. All other have only singgular forms and are declined as follows:

type >	animate	inanimate
case    v
nominative	kö	ce
genitive	kökkö	cekkö
dative	köm	cem
accusative	kë	co
vocative
ablative	këm	cim
locative	köm	cem
instrumental	küm	cum

examples

    akenu? leenu (or desenu) - which one? left (right) vs. aku? pelü (or iisu) - which one? white (or high)