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Question

Aqua regia is prepared by mixing concentrated HCland concentrated HNO3in the ratio:


A

1:3

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B

1:4

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C

3:1

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D

3:2

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Solution

The correct option is C

3:1


The explanation for the correct option:

(C) Aqua regia: It is a yellow-orange or red-colored fuming liquid.

  • Aqua regia is a mixture of concentrated Hydrochloric acid, (HCl) and Nitric acid, (HNO3) in a ratio of 3:1.

Uses of Aqua regia:

  • It can dissolve noble metals such as Gold (Au)and Platinum(Pt).
  • Aqua regia is mainly used for the manufacture of Chloroauric acid (HAuCl4)
  • It is used as an electrolyte in the Wohlwill process to refine gold to the purity of 99.999%.

Hence, option (C) is correct.


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