Aqua regia is used for dissolving noble metals (Au, Pt, etc.). The gas evolved in this process is :
Solution
Au + 4H<sup>+</sup> + NO<sub>3</sub><sup>-</sup> + 4Cl<sup>-</sup> $\to$ AuCl<sub>4</sub><sup>-</sup> + NO + 2H<sub>2</sub>O
<br><br> 3Pt + 16H<sup>+</sup> + 4NO<sub>3</sub><sup>-</sup> + 18Cl<sup>-</sup> $\to$ 3PtCl<sub>6</sub><sup>2-</sup> + 4NO + 8H<sub>2</sub>O
About this question
Subject: Chemistry · Chapter: p-Block Elements · Topic: Group 13: Boron Family
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