Question

Aqua Regia is a mixture of $3:1$

• A. $\mathrm{HCl}:{\mathrm{HNO}}_3$
• B. ${\mathrm{HNO}}_3:\mathrm{HCl}$
• C. ${\mathrm{H}}_2{\mathrm{SO}}_4:{\mathrm{H}}_2{\mathrm{SO}}_4$
• D. ${\mathrm{HNO}}_3:{\mathrm{H}}_2{\mathrm{SO}}_4$

Answer 1

The correct option is A

$\mathrm{HCl}:{\mathrm{HNO}}_3$

1. Aqua Regia is a freshly prepared mixture of Hydrochloric acid$\mathbf{\left(}\mathbf{HCl}\mathbf{\right)}$ and Nitric acid$\mathbf{\left(}{\mathbf{HNO}}_{\mathbf{3}}\mathbf{\right)}$ in the molar ratio of $3:1$.
2. It can dissolve noble metals like Platinum$\mathbf{\left(}\mathbf{Pt}\mathbf{\right)}$, Gold$\mathbf{\left(}\mathbf{Au}\mathbf{\right)}$ etc.
3. It is a yellowish coloured liquid.

Thus, Aqua Regia is a mixture of hydrochloric acid$\mathbf{\left(}\mathbf{HCl}\mathbf{\right)}$ and nitric acid$\mathbf{\left(}{\mathbf{HNO}}_{\mathbf{3}}\mathbf{\right)}$ in the molar ratio of $3:1$. So, the correct option is A.