Phản ứng nào sau đây sai?
A. $\displaystyle \text{2CrO + 2NaOH }\xrightarrow{{}}\text{ 2NaCr}{{\text{O}}_{\text{2}}}\text{ }\!\!~\!\!\text{ + }{{\text{H}}_{\text{2}}}$
B. $\displaystyle \text{4Cr}{{\left( \text{OH} \right)}_{\text{2}}}\text{ }\!\!~\!\!\text{ + }{{\text{O}}_{\text{2}}}\text{ }\!\!~\!\!\text{ + 2}{{\text{H}}_{\text{2}}}\text{O }\xrightarrow{{}}\text{ 4Cr}{{\left( \text{OH} \right)}_{\text{3}}}\text{ }\!\!~\!\!\text{ }$
C. $\displaystyle \text{6CrC}{{\text{l}}_{\text{2}}}\text{ }\!\!~\!\!\text{ + 3B}{{\text{r}}_{\text{2}}}\text{ }\!\!~\!\!\text{ }\xrightarrow{{}}\text{ 4CrC}{{\text{l}}_{\text{3}}}\text{ }\!\!~\!\!\text{ + 2CrB}{{\text{r}}_{\text{3}}}$
D. $\displaystyle \text{Cr}{{\left( \text{OH} \right)}_{\text{2}}}\text{ }\!\!~\!\!\text{ + }{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\text{ }\!\!~\!\!\text{ }\xrightarrow{{}}\text{ CrS}{{\text{O}}_{\text{4}}}\text{ }\!\!~\!\!\text{ + 2}{{\text{H}}_{\text{2}}}\text{O}$
A. $\displaystyle \text{2CrO + 2NaOH }\xrightarrow{{}}\text{ 2NaCr}{{\text{O}}_{\text{2}}}\text{ }\!\!~\!\!\text{ + }{{\text{H}}_{\text{2}}}$
B. $\displaystyle \text{4Cr}{{\left( \text{OH} \right)}_{\text{2}}}\text{ }\!\!~\!\!\text{ + }{{\text{O}}_{\text{2}}}\text{ }\!\!~\!\!\text{ + 2}{{\text{H}}_{\text{2}}}\text{O }\xrightarrow{{}}\text{ 4Cr}{{\left( \text{OH} \right)}_{\text{3}}}\text{ }\!\!~\!\!\text{ }$
C. $\displaystyle \text{6CrC}{{\text{l}}_{\text{2}}}\text{ }\!\!~\!\!\text{ + 3B}{{\text{r}}_{\text{2}}}\text{ }\!\!~\!\!\text{ }\xrightarrow{{}}\text{ 4CrC}{{\text{l}}_{\text{3}}}\text{ }\!\!~\!\!\text{ + 2CrB}{{\text{r}}_{\text{3}}}$
D. $\displaystyle \text{Cr}{{\left( \text{OH} \right)}_{\text{2}}}\text{ }\!\!~\!\!\text{ + }{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\text{ }\!\!~\!\!\text{ }\xrightarrow{{}}\text{ CrS}{{\text{O}}_{\text{4}}}\text{ }\!\!~\!\!\text{ + 2}{{\text{H}}_{\text{2}}}\text{O}$
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