Noble metals like gold and platinum are soluble in which of the following mixtures?

Question

Noble metals like gold and platinum are soluble in which of the following mixtures? (A) 1: 1 mixture of conc. HNO3 and conc. H2SO4 (B) 1: 3 mixture of conc. HCl and conc. HNO3 (C) 1: 3 mixture of conc. HNO3 and conc. HCl (D) 1: 3 mixture of conc. H2SO4 and conc. HCl

Tardigrade Admin · Accepted Answer

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

Q. Noble metals like gold and platinum are soluble in which of the following mixtures?

$1 : 1$ mixture of conc. $H N O_{3}$ and conc. $H_{2} S O_{4}$

$1 : 3$ mixture of conc. $H Cl$ and conc. $H N O_{3}$

$1 : 3$ mixture of conc. $H N O_{3}$ and conc. $H Cl$

$1 : 3$ mixture of conc. $H_{2} S O_{4}$ and conc. $H Cl$

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. $3 H Cl + 1 H N O_{3} =$ aqua-regia

Q. Noble metals like gold and platinum are soluble in which of the following mixtures?

1:1 mixture of conc. HNO3​ and conc. H2​SO4​

1:3 mixture of conc. HCl and conc. HNO3​

1:3 mixture of conc. HNO3​ and conc. HCl

1:3 mixture of conc. H2​SO4​ and conc. HCl

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. 3HCl+1HNO3​= aqua-regia

$1 : 1$ mixture of conc. $H N O_{3}$ and conc. $H_{2} S O_{4}$

$1 : 3$ mixture of conc. $H Cl$ and conc. $H N O_{3}$

$1 : 3$ mixture of conc. $H N O_{3}$ and conc. $H Cl$

$1 : 3$ mixture of conc. $H_{2} S O_{4}$ and conc. $H Cl$

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. $3 H Cl + 1 H N O_{3} =$ aqua-regia