Question

Степень окисления азота HNO3, NaNO3, Na2O, NH4H2PO4, N2, NH4OH. 2) в каких соединениях хром проявляет как окислительные так и вост. Свойства K2CrO7, Cr, KCrO2, Cr2O3 и почему ?

Answer 1

1)Cтепени окисдения азота по порядку  +5 , +5 , +1, +1, 0, -3,
2) KCrO2 , Cr2O3
потому что хром находится в промежуточной степени окисления (+3),а значит может как отдавать электроны,так и принимать их

Answer 2

Oxidation States of Nitrogen Compounds:

The oxidation state of an element in a compound refers to the hypothetical charge that the atom would have if all its bonds were 100% ionic. Here are the oxidation states of nitrogen in the given compounds:

1. HNO3 (nitric acid): The oxidation state of nitrogen in HNO3 is +5. [[1]] 2. NaNO3 (sodium nitrate): The oxidation state of nitrogen in NaNO3 is +5. [[2]] 3. Na2O (sodium oxide): Nitrogen is not present in Na2O, so it does not have an oxidation state in this compound. 4. NH4H2PO4 (ammonium dihydrogen phosphate): The oxidation state of nitrogen in NH4H2PO4 is -3. [[3]] 5. N2 (nitrogen gas): The oxidation state of nitrogen in N2 is 0. [[4]] 6. NH4OH (ammonium hydroxide): The oxidation state of nitrogen in NH4OH is -3. [[5]]

Oxidizing and Reducing Properties of Chromium Compounds:

Chromium can exhibit both oxidizing and reducing properties depending on the compound it is present in. Let's look at the oxidation states of chromium in the given compounds and discuss their properties:

1. K2CrO7 (potassium dichromate): The oxidation state of chromium in K2CrO7 is +6. Potassium dichromate is a strong oxidizing agent and can easily donate oxygen atoms or accept electrons from other substances, thereby causing them to be reduced. It is commonly used in laboratory settings for various oxidation-reduction reactions. [[6]] 2. Cr (chromium metal): The oxidation state of chromium in its elemental form (Cr) is 0. Chromium metal is not particularly reactive and does not exhibit strong oxidizing or reducing properties. 3. KCrO2 (potassium chromite): The oxidation state of chromium in KCrO2 is +2. Potassium chromite is a reducing agent and can easily donate electrons to other substances, thereby causing them to be oxidized. It is used in various industrial processes, such as the production of pigments and dyes. [[7]] 4. Cr2O3 (chromium(III) oxide): The oxidation state of chromium in Cr2O3 is +3. Chromium(III) oxide is not a strong oxidizing or reducing agent. It is commonly used as a pigment and in the production of refractory materials. [[8]]

In summary, the oxidation state of nitrogen varies depending on the compound, ranging from +5 to -3. Chromium can exhibit both oxidizing and reducing properties depending on the compound it is present in. Potassium dichromate (K2CrO7) is a strong oxidizing agent, while potassium chromite (KCrO2) is a reducing agent. Chromium metal (Cr) and chromium(III) oxide (Cr2O3) do not exhibit strong oxidizing or reducing properties.