Решите цепочку превращений : Cr-->CrCl3-->Cr (OH)3-->Cr2O3-->CrPO4
2Сr + 3Cl2 -> 2CrCl3 CrCl3 + 3NaOH -> Cr(OH)3 + 3NaCl 2Cr(OH)3 -> Cr2O3 + 3H2O Cr2O3 + 2H3PO4 -> 2CrPO4 + 3H2O
Cr + 3HCI += CrCl3 + H3
CrCl3 + 3NaOH -> Cr(OH)3 + 3NaCl 2Cr(OH)3 -> Cr2O3 + 3H2O Cr2O3 + 2H3PO4 -> 2CrPO4 + 3H2O