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BITSAT 2013 Solved Question Paper
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© examsnet.com
Question : 45
Total: 150
The ions
O
2
–
,
F
–
,
N
a
+
,
M
g
2
+
and
A
l
3
+
are isoelectronic. Their ionic radii show :
A decrease from
O
2
–
to
F
–
and then increase from
N
a
+
to
A
l
3
+
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
+
Validate
Solution:
Amongst isoelectronic species, ionic radii of anion is more than that of cations. Further size of anion increase with increase in –ve charge and size of cation decrease with increase in + ve charge. Hence ionic radii decreases from
O
2
–
to
A
l
3
+
.
© examsnet.com
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