Aqua regia is used for dissolving noble metals

Question:

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

  1. $\mathrm{N}_{2}$

  2. $\mathrm{N}_{2} \mathrm{O}_{3}$

  3. NO

  4. $\mathrm{N}_{2} \mathrm{O}_{5}$


Correct Option: , 3

Solution:

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

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