a) Saloni needs to add water and shake the test tube afterwards test it with litmus paper and the litmus will turn red that will confirm that the gas is acidic.
b) [tex]\mathrm{C}+\mathrm{O}_{2} \rightarrow \mathrm{CO}_{2}[/tex]
[tex]$\mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O} \longrightarrow \mathrm{H}_{2} \mathrm{CO}_{3}$[/tex]
What is a litmus test?
A litmus test is a test which is conducted to check the presence of acid and base in a chemical solution . A litmus paper is used which is made from a particular species of lichens. A litmus will turn to blue color when exposed to a base and to red color when exposed to an acid.
In the Given question, Charcoal contains carbon, when it is burned it reacts with oxygen present in the atmosphere to form Carbon dioxide and later when this carbon dioxide reacts with water, it is converted into carbonic acid gas. The acidic nature of the compound is proved later with the litmus test.
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