First slide

Hydrogen chloride

Question

Aquaregia is used to dissolve noble metals. Aquaregia is

Easy

A

$1 part of conc . {HNO}_{3} + 3 parts of conc . HCl$
B

$1 part of conc . {HNO}_{3} + 1 part of conc . HCl$
C

$3 parts of conc . {HNO}_{3} + 1 part of conc . HCl$
D

$1 part of conc . {HNO}_{3} + 1 part of conc . H_{2} {SO}_{4}$

Solution

Aquaregia is 3 parts of conc. $HCl$ and 1 part of conc. ${HNO}_{3}$ .
It forms NOCl which liberates nascent chlorine;
Nascent chlorine is responsible for the dissolution of Au and Pt.

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