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!