Chemistry · p-Block Elements (Group 15-18)

JEE Advanced 2019 — Paper 2 — Question 17

With reference to aqua regia, choose the correct option(s)

Option A:
The yellow colour of aqua regia is due to the presence of NOCl and $\mathrm{Cl}_{2}$
Correct
Option B:
Aqua regia is prepared by mixing conc. HCl and conc. $\mathrm{HNO}_{3}$ in $3: 1(\mathrm{v} / \mathrm{v})$ ratio
Correct
Option C:
Reaction of gold with aqua regia produces an anion having Au in +3 oxidation state
Correct
Option D:
Reaction of gold with aqua regia produces $\mathrm{NO}_{2}$ in the absence of air

Answer: A, B, C

$\mathrm{Au}+\mathrm{HNO}_{3}+3 \mathrm{HCl} \longrightarrow \mathrm{HAuCl}_{4}+\mathrm{NO}+\mathrm{H}_{2} \mathrm{O}$

Yellow colour of aqua - regia is due to NOCl and $\mathrm{Cl}_{2}$ .

In aqua regia HCl and $\mathrm{HNO}_{3}$ are in 3:1 molar ratio

Answer key and solution verified before publishing.

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