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Standard XII
Chemistry
Nomenclature of Coordination Compounds
What Are Grou...
Question
What Are Group
2
Cations?
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Solution
Cations:
It is defined as positively charged ions that migrate towards the cathode.
Cation is a word derived from the Greek word
kation
which means ‘to go down.
It has more protons than electrons, which gives it a net positive charge.
The number of electrons lost gives the positive group.
Group
II
Cations:
Group 2 Cations produce insoluble sulfides.
It can be precipitated by adding an acidic solution of Hydrogen Sulfide
H
2
S
.
Examples of Group 2 Cations:
Mercuric ion
Hg
2
+
Lead (II) ion
Pb
2
+
Cupric ion
Cu
2
+
Bismuth ion
Bi
3
+
Cadmium ion
Cd
2
+
Arsenic ion
As
3
+
Antimony (III) ion
Sb
3
+
Tin or Stannic ion
Sn
4
+
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