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Standard XII
Biology
Conduction in Heart
What is 4 -fo...
Question
What is 4-fold axis and 2-fold axis?
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Solution
A four fold
rotoinversion
axis
is symbolized as . Note that an object possessing a
4
-
fold
rotoinversion
axis
will have two faces on top and two identical faces upside down on the bottom, if the
axis
is held in the vertical position
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Q.
Atoms A, B, C and D are present at corners, face centres, body centre and edge centres respectively. If atoms touching one of the 2-fold axis, 3-fold axis and 4-fold axis are removed, then total number of atoms remaining per unit cell is
X
+
1
4
.The value of X is
.
Q.
In the molecule
X
e
O
2
F
2
, there exists one
n
-fold axis of symmetry and in the molecule
X
e
O
2
F
4
, the number of
2
-fold axis of symmetry is
m
. The value of
m
+
n
is :
Q.
The molecule having three fold axis of symmetry is:
Q.
The molecule having three folds of axis of symmetry is:
Q.
Which of the following molecules has three-fold axis of symmetry?
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