Question

Fe > Fe3O4 > FeCl3 > Fe2(SO4)3 > Fe(OH)3 > K [Fe(OH)4 > Fe2O3

Answer 1

Ответ:

3Fe+2O2=Fe3O4

Fe3O4 + 8HCl → FeCl2 + 2FeCl3 + 4H2O

2FeCl3+3H2SO4=Fe2(SO4)3+6HCl

Fe2(SO4)3+6NaOH=3Na2SO4+2Fe(OH)3

Fe(OH)3+KOH=K[Fe(OH)4]

2K[Fe(OH)4]=Fe2O3 + 2KOH + 3H2O

Answer 2

The given sequence represents a list of compounds involving iron (Fe) arranged in order of increasing oxidation states or complexity:

Fe > Fe3O4 > FeCl3 > Fe2(SO4)3 > Fe(OH)3 > K[Fe(OH)4] > Fe2O3

Let's break down each compound in the sequence:

1. Fe: This represents elemental iron, where iron has an oxidation state of 0.
2. Fe3O4: This compound is known as magnetite and consists of a mixture of Fe2+ and Fe3+ ions. It has a more complex structure than elemental iron.
3. FeCl3: This compound is iron(III) chloride, where iron has an oxidation state of +3 and exists as Fe3+ ions.
4. Fe2(SO4)3: This compound is iron(III) sulfate, which contains iron in the +3 oxidation state. It consists of Fe3+ ions and sulfate (SO4)2- ions.
5. Fe(OH)3: This compound is iron(III) hydroxide, where iron has an oxidation state of +3. It consists of Fe3+ ions and hydroxide (OH-) ions.
6. K[Fe(OH)4]: This compound is potassium tetrakis(hydroxido)ironate(III), where iron has an oxidation state of +3. It contains the Fe(OH)4- complex ion, with potassium (K+) as a counterion.
7. Fe2O3: This compound is iron(III) oxide or hematite, where iron has an oxidation state of +3. It consists of Fe3+ ions and oxide (O2-) ions.

In this sequence, as you move from left to right, the oxidation state of iron generally increases or the compounds become more complex, except for the transition from Fe2(SO4)3 to Fe(OH)3, where the complexity increases while the oxidation state remains the same.