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

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

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

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

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

answer is C.

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Detailed Solution

Nobel 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 $3 H C l + 1 H N O_{3} = a q u a - r e g i a$

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