NTA Abhyas 2020
- Exam
- NTA Abhyas
- Year
- 2020
- Subject
- Chemistry
- Chapter
- Solid State
NTA Abhyas 2020 · Chemistry · Solid State
In a hypothetical solid, C atoms are found to form cubical...
In a hypothetical solid, C atoms are found to form cubical close-packed lattice. A atoms occupy all tetrahedral voids and B atoms occupy all octahedral voids.
A and B atoms are of appropriate size, so that there is no distortion in the CCP lattice of C& atoms. Now, if a plane as shown in the following figure is cut, then the cross section of this plane will look like
A and B atoms are of appropriate size, so that there is no distortion in the CCP lattice of C& atoms. Now, if a plane as shown in the following figure is cut, then the cross section of this plane will look like
Options
- A
- B
- C
- D
Correct answer
C.
Step-by-step solution
From figure, it is clear that 4 corners and 2 face centers lie on the shaded plane. Therefore, there will be six C atoms, and atoms (marked A) in TVs do not touch other.
Fig (i) is not possible; four atom marked C.
Fig. (ii) is not possible, atoms A in TVs are not shown in figure.
Fig. (iii) is possible, since atoms A in TVs are not touching each other. There are four atoms A on two body diagonals contained in shades plane.
Fig (iv) is not possible, since atoms A in TVs are touching each other.
Fig (i) is not possible; four atom marked C.
Fig. (ii) is not possible, atoms A in TVs are not shown in figure.
Fig. (iii) is possible, since atoms A in TVs are not touching each other. There are four atoms A on two body diagonals contained in shades plane.
Fig (iv) is not possible, since atoms A in TVs are touching each other.