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Chemistry
Noble metals like gold and platinum are soluble in which of the following mixtures?
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Q. Noble metals like gold and platinum are soluble in which of the following mixtures?
AP EAMCET
AP EAMCET 2019
A
$1 : 1$ mixture of conc. $HNO_3$ and conc. $H_2SO_4$
0%
B
$1 : 3$ mixture of conc. $HCl$ and conc. $HNO_3$
0%
C
$1 : 3$ mixture of conc. $HNO_3$ and conc. $HCl$
50%
D
$1 : 3$ mixture of conc. $H_2SO_4$ and conc. $HCl$
50%
Solution:
Nubel metal such as gold and platinum are soluble in aqua-regia which is a mixture of nitric acid and hydrochloric acid in molar ratio of $1: 3$.
i.e. $3 HCl +1 HNO _{3}=$ aqua-regia