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Câu hỏi: Viết các phương trình hóa học cho những chuyển đổi sau
$ \eqalign{
& 1, Cr + 2HCl\buildrel {} \over
\longrightarrow CrC{l_2} + {H_2} \uparrow \cr
& 2, CrC{l_2} + 2NaOH\buildrel {{t^0}} \over
\longrightarrow Cr{\left(OH\right)_2} \downarrow + 2NaCl. \cr
& 3, 4Cr{\left(OH\right)_2} + {O_2} + 2{H_2}O\buildrel {} \over
\longrightarrow 4Cr{\left(OH\right)_3}. \cr
& 4, Cr{\left(OH\right)_3} + NaOH\buildrel {} \over
\longrightarrow Na[Cr{\left(OH\right)_4}{\rm{]}} \cr
& 5, 2CrC{l_2} + Cl_2\buildrel {{t^0}} \over
\longrightarrow 2CrC{l_3} \cr
& 6, Cr{\left(OH\right)_3} + 3HCl\buildrel {} \over
\longrightarrow CrC{l_3} + 3{H_2}O. \cr} $
& 1, Cr + 2HCl\buildrel {} \over
\longrightarrow CrC{l_2} + {H_2} \uparrow \cr
& 2, CrC{l_2} + 2NaOH\buildrel {{t^0}} \over
\longrightarrow Cr{\left(OH\right)_2} \downarrow + 2NaCl. \cr
& 3, 4Cr{\left(OH\right)_2} + {O_2} + 2{H_2}O\buildrel {} \over
\longrightarrow 4Cr{\left(OH\right)_3}. \cr
& 4, Cr{\left(OH\right)_3} + NaOH\buildrel {} \over
\longrightarrow Na[Cr{\left(OH\right)_4}{\rm{]}} \cr
& 5, 2CrC{l_2} + Cl_2\buildrel {{t^0}} \over
\longrightarrow 2CrC{l_3} \cr
& 6, Cr{\left(OH\right)_3} + 3HCl\buildrel {} \over
\longrightarrow CrC{l_3} + 3{H_2}O. \cr} $