FIDA, Saifatun Nur Hafidzah Z. 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, 2026. Disponível em: https://journal.walisongo.ac.id/index.php/jec/article/view/27138. Acesso em: 6 jun. 2026.