218. (v21-126-11) Nomalum metall sulfat eritmasi sovutilganda 0,4 mol kristallogidrat hosil boldi, uning tarkibida suvsiz tuzning massa ulushi 64 % ga teng, kristallizatsion suvning massasi suvsiz tuzning massasidan 28 g ga kam. Nomalum metallni toping.
A) Fe B)AI
C) Cu
D) Cr