describe what happen when a piece of wet red litmus paper is passed through a hydrogen gas.
When a piece of wet red litmus paper is passed through a hydrogen gas, it does not undergo any visible changes. Red litmus paper is used as an indicator for acidity, and it doesn't react with gases like hydrogen.
However, if the same wet red litmus paper is passed through a gas that is acidic, such as hydrochloric acid (HCl), it would turn blue. This color change occurs because red litmus paper is red in its acidic form and turns blue in the presence of a base or alkaline substance. Hydrogen gas, in its pure form, is neither acidic nor basic, so it does not cause any color change in the red litmus paper.
To determine the nature of a gas, if it is acidic or basic, you can perform a different test called the pH test. It involves using pH paper or a pH indicator solution, which can provide a more accurate measurement of the acidity or alkalinity of a substance. The pH scale ranges from 0 to 14, with 7 being neutral, values below 7 indicating acidity, and values above 7 indicating alkalinity. Performing a pH test would be a more appropriate method to determine the acidic or basic nature of a gas like hydrogen.