Question

most met react with dilute mineral acid to give hydrogen gas what is characteristic test of hydrogen gas​

Answer 1

Answer:

Let us first understand what a metal is. Metals will easily lose their electrons and will form the cations. Metals can produce hydrogen gas with hydrochloric acid only when the metal will be able to replace the hydrogen atom from the HCl. In order to replace the hydrogen atom from the HCl gas, the metals should be placed above the hydrogen atom in the reactivity series of metals. Metals which cannot replace hydrogen will be placed below the hydrogen atom in the reactivity series. Less reactive metals such as Silver, copper and Gold will be placed below the hydrogen atom in the reactivity series and therefore they do not produce hydrogen gas. Certain metals like Aluminium, magnesium and Zinc are highly reactive and they produce hydrogen gas with hydrochloric acid.

Let us see one example.

Mg+2HCl→MgCl2+H2

Hence copper is the metal which does not produce the hydrogen gas.

Explanation:

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Answer 2

Metal:-

• Metals lose their electrons easily and create cations. Metals can only make hydrogen gas from hydrochloric acid if they are able to replace the hydrogen atom in the HCl.

• Metals should be positioned above the hydrogen atom in the reactivity sequence of metals to replace the hydrogen atom from the HCl gas.

• Metals that cannot replace hydrogen in the reactivity series will be positioned below the hydrogen atom.
• Silver, copper, and gold are less reactive metals that are placed below the hydrogen atom in the reactivity series and hence do not form hydrogen gas.

• Aluminum, magnesium, and zinc are highly reactive metals that create hydrogen gas when exposed to hydrochloric acid.

Let's have a look at an example.

Mg+2HCl→MgCl2+H2

As a result, copper is the only metal that does not create hydrogen gas.