Question

1) Cr->Cr2O3->CrCl3->Cr(OH)3->Cr2(SO4)3

Answer 1

4Cr + 3O2 = 2Cr2O3

Cr2O3 + 6HCl = 2CrCl3 + 3H2O

CrCl3 + 3AgOH = Cr(OH)3 + 3AgCl

2Cr(OH)3 + 3H2SO4 = Cr2(SO4)3 + 6H2O