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Chemistry
With reference to aqua regia, choose the correct option(s)
Q. With reference to aqua regia, choose the correct option(s)
2783
224
JEE Advanced
JEE Advanced 2019
The p-Block Elements - Part2
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A
Aqua regia is prepared by mixing cone. HCI and cone.
H
N
G
3
in 3:1 (v/v) ratio
81%
B
Reaction of gold with aqua regia produces an anion having Au in +3 oxidation state
69%
C
Reaction of gold with aqua regia produces
N
O
2
in the absence of air
44%
D
The yellow colour of aqua regia is due to the presence of NOCI and
C
l
2
56%
Solution:
(
1
)
A
u
+
H
N
O
3
+
4
H
Cl
→
A
u
C
l
4
Θ
+
H
3
O
+
+
NO
+
H
2
O
(
2
)
Aqua regia
=
3
H
Cl
(conc.)
+
H
N
O
3
(conc.)
(
3
)
A
u
C
l
4
Θ
is produced
(
4
)
Yellow colour of aqua regia is due to it's decomposition into
NOCl
(orange yellow) and
C
l
2
(greenish yellow).