SAIFATUN NUR HAFIDZAH FIDA; RINANINGSIH RINANINGSIH. Development of Diagnostic Test Instruments as Placement Tests to Determine Students’ Cognitive Learning Levels on Acid-Base Material. Journal of Educational Chemistry (JEC), [S. l.], v. 7, n. 2, p. 101–108, 2025. DOI: 10.21580/jec.2025.7.2.27138. Disponível em: https://journal.walisongo.ac.id/index.php/jec/article/view/27138. Acesso em: 23 jul. 2026.