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Aqua regia is used for dissolving noble metals (Au, Pt, etc.). The gas evolved in this process is:

Chemistry

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18/09/2020 10:23 am

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aditi07

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Aqua regia is used for dissolving noble metals (Au, Pt, etc.). The gas evolved in this process is:

(1) N₂

(2) NO

(3) N₂O₅

(4) N₂O₃

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1 Answer

18/09/2020 10:33 am

nikhil04

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Correct answer: (2) NO

Explanation:

Aqua regia is HNO₃ : HCl

1 : 3

HNO₃ + 3HCl → 2H₂O + NO + 3[Cl]

(i) Au + 3[Cl] → AuCl₃ + HCl → HAuCl₄

(ii) Pt + 4[Cl] → PtCl₄ + HCl → H₂PtCl₆

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