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Class 12 NEET Chemistry D And F Block Elements Questions
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© examsnet.com
Question : 72
Total: 108
The correct order of ionic radii of
Y
3
+
La
3
+
,
Eu
3
+
and
Lu
3
+
is(At. nos.
Y
=
39
,
La
=
57
,
Eu
=
63
,
Lu
=
71
)
(2002)
Y
3
+
<
La
3
+
<
Eu
3
+
<
Lu
3
+
Y
3
+
<
Lu
3
+
<
Eu
3
+
<
La
3
+
Lu
3
+
<
Eu
3
+
<
La
3
+
<
Y
3
+
La
3
+
<
Eu
3
+
<
Lu
3
+
<
Y
3
+
Validate
Solution:
On going from
La
3
+
to
Lu
3
+
, the ionic radius shrinks from
1.15
Å
to
0.93
Å
(lanthanide contraction). The radius of
La
3
+
is also larger than that of
Y
3
+
ion which lies immediately above it in periodic table.
© examsnet.com
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