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JEE Main 20203 SeptemberMorning Shift

Exam: JEE Main
Year: 2020
Date: 3 September
Shift: Morning Shift
Subject: Chemistry
Chapter: p Block Elements (Group 15, 16, 17 & 18)

JEE Main 2020 · 3 September · Morning Shift · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Aqua regia is used for dissolving noble metals (Au, Pt, etc.). The...

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

Options

A $NO$
B ${N}_{2}{O}_{5}$
C ${N}_{2}$
D ${N}_{2}{O}_{3}$

Correct answer

A. $NO$

Step-by-step solution

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

$1: 3$

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

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

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

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