Cr->CrCl3->Cr(OH)3->Cr2O3->Cr

Question

Cr->CrCl3->Cr(OH)3->Cr2O3->Cr

Answer 1

2Сr+6HCL=2CrCl3 + 3H2

CrCl3+3NaOH(конц)=Cr(OH)3 + 3NaCl

 

2Cr(OH)3 ---t---> Cr2O3 + 3H2O

Cr2O3 + 2Al = Al2O3 + 2Cr