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JEE Main20203 Sep 2020Morning ShiftChemistryp Block Elements (Group 15, 16, 17 & 18)Actual

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

Options

  1. ANO
  2. BN 2 O 5
  3. CN 2
  4. DN 2 O 3

Correct answer

A. NO

Step-by-step solution

Aqua regia is HNO 3   :   HCl 1       :       3 HNO 3 + 3 HCl     →     2 H 2 O + NO + 3 Cl (i) Au + 3 Cl   →   AuCl 3 → HCl HAuCl 4 (ii) Pt + 4 Cl     →   PtCl 4   → HCl H 2 PtCl 6

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