1)Au +H2So4(к) 2)Mg+H2So4(р) 3)Ag+H2So4(p) 4)Cu

It looks like you're listing reactions involving various metals with sulfuric acid (H₂SO₄). Let me break down the reactions you presented: 1. **Gold (Au) + Concentrated sulfuric acid (H₂SO₄):** - Gold does not react with concentrated sulfuric acid due to its inertness. It is resistant to oxidation and will not dissolve in H₂SO₄. 2. **Magnesium (Mg) + Dilute sulfuric acid (H₂SO₄):** - This reaction proceeds readily. When magnesium reacts with dilute sulfuric acid, it produces magnesium sulfate (MgSO₄) and hydrogen gas (H₂). - **Balanced Reaction:** \[ Mg + H₂SO₄ \rightarrow MgSO₄ + H₂↑ \] 3. **Silver (Ag) + Dilute sulfuric acid (H₂SO₄):** - Silver does not react with dilute sulfuric acid in a significant way; it is relatively inert to it. However, in the presence of concentrated sulfuric acid and heat, it may participate in slower side reactions depending on the conditions. 4. **Copper (Cu) + Concentrated sulfuric acid (H₂SO₄):** - Copper reacts with concentrated sulfuric acid, but the reaction is not vigorous. It produces copper(II) sulfate (CuSO₄), sulfur dioxide (SO₂), and water. - **Balanced Reaction:** \[ Cu + 2H₂SO₄ \rightarrow CuSO₄ + SO₂↑ + 2H₂O \] If you need more information or additional reactions, feel free to ask!