Saloni took a piece of burning charcoal and collected the gas evolved in a test tube.

How will she find the nature of the gas?

• In the test tube where the gas is collected, Saloni needs to add some water.
• She must cover the tube and shake it vigorously.
• She will now use both red and blue litmus to test the solution.
• When blue litmus turns red, it indicates that the gas is acidic.

Chemical reaction:

$$\begin{gathered} \mathrm{C}\left(\mathrm{s}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\to {\mathrm{CO}}_2\left(\mathrm{g}\right) \\ \mathrm{Carbon}\mathrm{Oxygen}\mathrm{Carbon}\mathrm{dioxide} \end{gathered}$$