Bài 3. Cho phản ứng: \({K_2}C{r_2}{O_7} + HCl\buildrel {} \over
\longrightarrow KCl + CrC{l_3} + {H_2}O + C{l_2}\)Trong phản ứng này có bao nhiêu phân tử \(HCl\) bị oxihóa(\eqaligA.3\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,B.6 \cr
& C.8\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,D.14 \cr} \)
