Aqua regia is used for dissolving noble metals (Au, Pt, etc.). The gas evolved in this process is : (A) N2 (B) NO (C) N2O5 (D) N2O3

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Question

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

(A) N2
(B) NO
(C) N2O5
(D) N2O3

Prashant Kotian · Accepted Answer

Correct answer: B. Aqua regia is HCl : : HNO3 HNO3 + 3HCl   2H2O + NO + 3[Cl] (i) Au + 3[Cl]   AuCl3   HCl HAuCl4 (ii) Pt + 4[Cl]   PtCl4   HCl H2PtCl6

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