HOC24
Lớp học
Môn học
Chủ đề / Chương
Bài học
Minh is very ... and Dr Lai notices this. She ... at Minh and tells him not to worry. She explains one of his teeth has a ... . He has to ... them regularly. After Dr Lai fills his tooth Minh leaves. He is very ... .
Crom (III) hiđroxit C r O H ) 3 tan trong dung dịch nào sau đây?
A. KNO3.
B. KCl.
C. NaOH.
D. NaCrO2.