S.N.
|
Formula
|
Name
of acids
|
Oxidation
No. of N
|
1
|
H2N2O2
or HNO
|
Hyponitrous acid
|
+1
|
2
|
H4N2O4 or H2NO2
|
Hydroxynitrous
acid
|
+2
|
3
|
HONO
or HNO2
|
Nitrous
acid
|
+3
|
4
|
HOONO
|
Pernitrous acid
|
+4
|
5
|
HNO3
|
Nitric
acid
|
+5
|
6
|
HNO4
|
Pernitric acid
|
+6
|
(1) Hyponitrous acid (H2N2O2):
Hyponitrous acid is a chemical compound
with formula H2N2O2 or HON=NOH. Hyponitrous acid is a weak acid in aqueous
solution and decomposes to N2O and water. It is an isomer of nitramide [H2N−NO2].
Hyponitrous
acid forms two series of salts, the hyponitrites containing the [ON=NO]2− anion,
and the "acid
hyponitrites" containing the [HON=NO]−anion.
(2) Nitrous acid (HNO2):
Nitrous acid
(HNO2) is a weak and monobasic acid known only in solution and
in the form of nitrite (NO2−) salts. Nitrous
acid is used to make diazonium salts from amines. The resulting diazonium
salts are reagents in azo coupling reactions to give azo dyes.
(3) Nitric acid (HNO3):
Nitric acid is also known as aqua fortis
(meaning strong water) which was given by alchemists.
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