Gold dissolves in aqua-regia forming:

Auric chloride

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Aurous chloride

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Chloroauric acid

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Aurous nitrate

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Solution

The correct option is C Chloroauric acid
Aqua regia is the mixture of concentrated hydrochloric acid and concentrated nitric acid in `1:3` ratio.

Gold dissolves in aqua-regia as,
`6HCl+3HNO_3 \rightarrow 2NO+4H_2O+3Cl_2`

$2 A u + 11 H C l + 3 H N O_{3} \to 2 H A u C l_{4} (c h l o r o a u r i c a c i d) + 3 N O C l + 6 H_{2} O$

$A u + 4 H C l + H N O_{3} \to H [A u C l_{4}] (c h l o r o a u r i c a c i d) + 2 H_{2} O + N O$

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