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प्रश्न
How will you identify the HCl gas using silver nitrate solution? Give reactions involved.
दीर्घउत्तर
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उत्तर
When hydrogen chloride (HCl) gas is passed through a solution of silver nitrate (AgNO3), a curdy white precipitate of silver chloride (AgCl) is formed.
To confirm the test, this white precipitate is treated with ammonium hydroxide (NH4OH). The precipitate completely dissolves in excess ammonium hydroxide to form a clear, soluble complex.
\[ \text{AgNO}_3 + \text{HCl} \longrightarrow \text{AgCl}\downarrow\text{ (white ppt.)} + \text{HNO}_3 \]
\[ \text{AgCl} + 2\text{NH}_4\text{OH} \longrightarrow [\text{Ag(NH}_3)_2]\text{Cl}\text{ (soluble)} + 2\text{H}_2\text{O} \]
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