Question

Напишите уравнения реакции
Cr+...= CrCl3 +..
CrCl3 +...= CrOH3+..
CrOH3+...=NaCrO2+...
CrOH3+...=Cr2O3

Answer 1

2Сr + 6HCL = 2CrCl3 + 3H2
CrCl3 + 3NaOH = 3NaCl + Cr(OH)3 
Cr(OH)3 + NaOH = NaCrO2 + 2H2O
2Cr(OH)3 = Cr2O3 + 3H2O