Q.

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

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a

NO

b

N2

c

N2O3

d

N2O5

answer is A.

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Detailed Solution

Au+4H(+)+NO3(-)+4Cl(-)→AuCl42(-)+NO+2H2O3Pt+16H(+)+4NO3(-)+18Cl(-1)→3PtCl62(-)+4NO+8H2OSo Aquaregia is used to dissolve Au, Pt Here, NO gas releases.
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Aqua regia is used for dissolving noble metals (Au, Pt, etc.). The gas evolved in this process is :