S Đ PH N NG CR + 2HCL CRCL2 + H2O CRCL2 + CL2 CRCL3CR...
Câu 27: S đ ph n ng
Cr + 2HCl CrCl
2
+ H
2
O
CrCl
2
+ Cl
2
CrCl
3
CrCl
3
+ 4NaOH Na[Cr(OH)
4
] + 3NaCl
2NaCrO
2
+ 3Br
2
+ 8NaOH 2Na
2
CrO
4
+ 6NaBr +4H
2
2
2
2
2
3
3
4
2
2
2
4
2