Class XII Chemistry Chapter 1 The Solid State NCERT Solution is given below.
Question
1.13:
Explain how much portion of an atom located at (i) corner and (ii) body-centre of a cubic unit cell is part of its neighbouring unit cell.
Answer
(i)An atom located at the corner of a cubic unit cell is shared by eight adjacent unit cells.
Therefore, 1/8 th portion of the atom is shared by one unit cell.
(ii)An atom located at the body centre of a cubic unit cell is not shared by its neighbouring unit cell. Therefore, the atom belongs only to the unit cell in which it is present i.e., its contribution to the unit cell is 1.
Explain how much portion of an atom located at (i) corner and (ii) body-centre of a cubic unit cell is part of its neighbouring unit cell.
Answer
(i)An atom located at the corner of a cubic unit cell is shared by eight adjacent unit cells.
Therefore, 1/8 th portion of the atom is shared by one unit cell.
(ii)An atom located at the body centre of a cubic unit cell is not shared by its neighbouring unit cell. Therefore, the atom belongs only to the unit cell in which it is present i.e., its contribution to the unit cell is 1.
Question
1.14:
What is the two dimensional coordination number of a molecule in square close packed layer?
Answer
In square close-packed layer, a molecule is in contact with four of its neighbours.
Therefore, the two-dimensional coordination number of a molecule in square closepacked layer is 4.
What is the two dimensional coordination number of a molecule in square close packed layer?
Answer
In square close-packed layer, a molecule is in contact with four of its neighbours.
Therefore, the two-dimensional coordination number of a molecule in square closepacked layer is 4.
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