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Question

Gold dissolves in aqua regia to give:

A
H[AuCl4]
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B
AuNO3
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C
H2[AuCl6]
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D
Au(NO3)3
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Solution

The correct option is A H[AuCl4]
Aqua regia is a strong acid which is formed by mixing concentrated nitric acid and concentrated hydrochloric acid in a 1:3 ratio.

When gold is dissolved in aqua regia, the following reaction occurs:
Au (s)+3NO3 (aq.)+6H+ (aq.)Au3+ (aq.)+3NO2 (g)+3H2O (l)

Au3+(aq.)+Cl(aq.)[AuCl4](aq.)

The formed complex reacts with a proton to form chloroauric acid.

H++[AuCl4]H[AuCl4]

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