# Explain the brown ring test with the help of the chemical equation.

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Hint: The molecular formula of nitric acid is $\text{N}{{\text{O}}_{3}}$. The compound is highly corrosive and can be detected through the organic tests in the laboratory. Aqua fortis is another name for the nitric acid.

$\text{2HN}{{\text{O}}_{3}}\text{ + 3}{{\text{H}}_{2}}\text{S}{{\text{O}}_{4}}\text{ + 6FeS}{{\text{O}}_{4}}\to \text{ 3F}{{\text{e}}_{2}}{{\left( \text{S}{{\text{O}}_{4}} \right)}_{3}}\text{ + 2NO + 4}{{\text{H}}_{2}}\text{O}$