Question

When any metal react with acid so the hydrogen gas is produced .Why?​

Answer 1

Explanation:

The general equation for a metal reacting with an acid is.

metal + acid → salt + hydrogen

Hydrogen is a colourless, odourless gas. So you may wish to confirm that the gas produced is indeed hydrogen.

In order to do this, run your experiment in a test tube. (E.g fill a small amount of acid, place some metal in, e.g magnesium) and place a bung inside the test tube to trap the gas.

Then, introduce a burning splint to the test tube. If a “Squeaky pop” occurs then you have confirmed that hydrogen is produced.