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

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

Chemistryp Block Elements (Group 15, 16, 17 & 18)JEE MainJEE Main 2020 (03 Sep Shift 1)

Options:

A $NO$
B $N_{2} O_{5}$
C $N_{2}$
D $N_{2} O_{3}$

Solution:

1345 Upvotes Verified Answer

The correct answer is:

NO

Aqua regia is ${HNO}_{3} : HCl$

$1 : 3$

${HNO}_{3} + 3 HCl \to 2 H_{2} O + NO + 3 [Cl]$

(i) $Au + 3 [Cl] \to {AuCl}_{3} \overset{HCl}{\to} {HAuCl}_{4}$

(ii) $Pt + 4 [Cl] \to {PtCl}_{4} \overset{HCl}{\to} H_{2} {PtCl}_{6}$

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