Question

Из числа перечисленных формул выпишите формулы только оксидов и определите в них степени окисления элементов. Cu2O,LiOH,H2SiO, Al(OH)3,NaOH,P2O2, Ca(NO2)2, Na2SO3, BaO,KOH, Zn(OH)2, HNO2, CrO2, H3PO4, MN2O7, Fe(OH)3, Fe (OH)2.

Answer 1

Cu2O (+1;-2)
BaO (+2;-2)
P2O2 (+1;-1)
CrO2 (+2;-1)
Mn2O7 (+7;-2)

Answer 2

Formulas of Oxides and their Oxidation States:

Here are the formulas of the compounds mentioned and their oxidation states:

1. Cu2O: This is copper(I) oxide. The oxidation state of copper in this compound is +1. [[1]] 2. LiOH: This is lithium hydroxide. It is not an oxide, but a hydroxide. The oxidation state of lithium in this compound is +1. [[2]] 3. H2SiO: This is not a valid chemical formula. It seems to be missing some elements or subscripts. 4. Al(OH)3: This is aluminum hydroxide. It is not an oxide, but a hydroxide. The oxidation state of aluminum in this compound is +3. [[3]] 5. NaOH: This is sodium hydroxide. It is not an oxide, but a hydroxide. The oxidation state of sodium in this compound is +1. [[4]] 6. P2O2: This is not a valid chemical formula. It seems to be missing some elements or subscripts. 7. Ca(NO2)2: This is calcium nitrite. It is not an oxide, but a nitrite. The oxidation state of calcium in this compound is +2. [[5]] 8. Na2SO3: This is sodium sulfite. It is not an oxide, but a sulfite. The oxidation state of sodium in this compound is +1. [[6]] 9. BaO: This is barium oxide. The oxidation state of barium in this compound is +2. [[7]] 10. KOH: This is potassium hydroxide. It is not an oxide, but a hydroxide. The oxidation state of potassium in this compound is +1. [[8]] 11. Zn(OH)2: This is zinc hydroxide. It is not an oxide, but a hydroxide. The oxidation state of zinc in this compound is +2. [[9]] 12. HNO2: This is nitrous acid. It is not an oxide, but an acid. The oxidation state of nitrogen in this compound is +3. [[10]] 13. CrO2: This is chromium(IV) oxide. The oxidation state of chromium in this compound is +4. [[11]] 14. H3PO4: This is phosphoric acid. It is not an oxide, but an acid. The oxidation state of phosphorus in this compound is +5. [[12]] 15. Mn2O7: This is manganese(VII) oxide. The oxidation state of manganese in this compound is +7. [[13]] 16. Fe(OH)3: This is iron(III) hydroxide. It is not an oxide, but a hydroxide. The oxidation state of iron in this compound is +3. [[14]] 17. Fe+(OH)2: This is not a valid chemical formula. It seems to be missing some elements or subscripts.

Please note that some of the formulas provided are not valid or complete. If you have any further questions or need clarification, feel free to ask!