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  4. Aqua regia is used for dissolving noble metals (Au, Pt, etc). The gas evolved in this process is:

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Q. Aqua regia is used for dissolving noble metals (Au, Pt, etc). The gas evolved in this process is:

JEE MainJEE Main 2020The p-Block Elements - Part2

Solution:

$Au + HNO _{3}+4 HCl \rightarrow HAuCl _{4}+ NO +2 H _{2} O$