HọcHóa.TT ChemJoy.TT · Chemistry Tools
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HọcHóa.TT — Practice & Quizzes
Practice & Quizzes
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MCQ‑multi scoring: score = correct_selected − wrong_selected, min 0, max = #correct.
Authoring tip: bracket‑charge for ions such as [SO4]2‑, [NO3]‑, [NH4]+.