Question
With reference to aqua regia , choose the correct option(s).
JEE Advanced
Chemistry
p Block Elements (Group 15, 16, 17 & 18)
2019
JEE Advanced 2019 (Paper 2)
JEE Advanced Chemistry Question (2019) — Solution
Options
- A. Reaction of gold with aqua regia produces N O 2 in the absence of air
- B. Aqua regia is prepared by mixing conc. H C l and conc. H N O 3 in 3 : 1 v / v ratio
- C. Reaction of gold with aqua regia produces an anion having A u in + 3 oxidation state
- D. The yellow colour of a q u a r e g i a is due to the presence of N O C l and C l 2
Answer
D. The yellow colour of a q u a r e g i a is due to the presence of N O C l and C l 2
Step-by-step solution
Aqua regia is 3 past HCl and 1 part H N O 3 3 HCl + HNO 2 → NOCl + Cl 2 + 2 H 2 O Yellow colour is due to NOCl and  Cl 2 Au + Aqua Regia → HAuCl 4 +3 O.S of Au
Related: Chemistry — p Block Elements (Group 15, 16, 17 & 18) · All PYQ Banks