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Test Index
Class 11 NEET Chemistry Classification Of Elements And Periodicity In Properties
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© examsnet.com
Question : 34
Total: 51
The ions
O
2
−
,
F
−
,
N
a
+
,
M
g
2
+
and
A
l
3
+
are isoelectronic. Their ionic radii show
(2003)
a significant increase from
O
2
−
to
A
l
3
+
a significant decrease from
O
2
−
to
A
l
3
+
an increase from
O
2
−
to
F
−
and then decrease from
N
a
+
to
A
l
3
+
a decrease from
O
2
−
to
F
−
and then increase from
N
a
+
to
A
l
3
+
Validate
Solution:
Amongst isoelectronic ions, ionic radii of anions is more than that of cations. Further size of the anion increases with increase in -ve charge and size of cation decreases with increase in +ve charge. Hence, correct order is
O
2
−
>
F
−
>
N
a
+
>
M
g
2
+
>
A
l
3
+
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