I goes all gloppy and odd
When iron powder is added to hydrochloric acid, a chemical reaction takes place which produces hydrogen gas and iron(II) chloride. The iron powder dissolves in the acid and the hydrogen gas is released as bubbles. The iron chloride formed remains in solution.
You would add iron oxide (rust) to sulfuric acid to produce iron sulfate and water in a chemical reaction.
When iron (Fe) is added to hydrochloric acid (HCl), the iron reacts with the acid to form iron (II) chloride (FeCl2) and hydrogen gas (H2). This is a single displacement reaction in which the more reactive iron displaces the hydrogen from the acid.
When dilute hydrochloric acid is added to an iron rod, a chemical reaction occurs where the iron reacts with the acid to form soluble iron chloride and hydrogen gas is released. This reaction is represented by the equation: Fe(s) + 2HCl(aq) -> FeCl2(aq) + H2(g). The iron rod will start to dissolve, producing bubbles of hydrogen gas and a solution of iron chloride.
If you add the same quantity of an acid and a base it will become neutral.i.e forms salt and water
When you add iron filings to nitric acid, you will observe a chemical reaction where the iron reacts with the nitric acid to produce iron nitrate and release nitrogen dioxide gas. It's a redox reaction in which the iron is oxidized and the nitric acid is reduced.
Nothing
It will neutralize the mix.
It will die , dump
When you add iron fillings to sulfuric acid, a chemical reaction occurs that results in the formation of iron sulfate and hydrogen gas. The iron sulfate typically appears as a green solution, while bubbles of hydrogen gas are released. This reaction is exothermic, meaning it produces heat.
A gentle abrasive, like tooth paste and cotton wool, will do that. However if you insist on acid, you can add to the cotton wool any acid, because the tarnish is silver sulphide and the acid will convert it to hydrogen sulphide, a gas
The pH remain unchanged.