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ICSE Class 10 Answered

How does aqua regia dissolves Gold and Platinum?  
Asked by kartikmangaliya22.10spicertl | 27 May, 2020, 21:55: PM
answered-by-expert Expert Answer
Nitric acid (1 part by volume) mixed with conc. hydrochloric acid (3 parts by volume) produces a mixture called aqua regia.
 
HNO3 + 3HCl → NOCl + 2H2O + 2[Cl]
 
Aqua regia contains nascent chlorine and reacts with noble metals such as gold and platinum to produce chlorides.
 
Pt + 4[Cl] → PtCl4
Au +3[Cl] → AuCl3
Answered by Ramandeep | 27 May, 2020, 22:01: PM

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