Solid State Quiz - ICSE Class 12 Chemistry
Free practice quiz: Solid State (ICSE Class 12 Chemistry). 10 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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The ratio of radius of cation to radius of anion in a tetrahedral void is approximately:
- 0.155
- 0.225
- 0.414
- 0.732
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Answer: B. 0.225
The tetrahedral void in a close-packed structure is formed by four spheres. The radius ratio (cation radius/anion radius) for a cation to fit ideally into a tetrahedral void is approximately 0.225.
Which of the following is a characteristic feature of a simple cubic crystal structure?
- High packing efficiency
- Coordination number of 12
- Atoms only at the corners of the cube
- Atoms at corners and face centers
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Answer: C. Atoms only at the corners of the cube
A simple cubic crystal structure is defined by having atoms located only at the eight corners of the cubic unit cell. Each corner atom is shared by eight unit cells. This structure has a low packing efficiency (about 52%) and a coordination number of 6.
The radius ratio for a cation to fit into an octahedral void in a close-packed structure is approximately:
- 0.155
- 0.225
- 0.414
- 0.732
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Answer: C. 0.414
An octahedral void is formed by six spheres. The ideal radius ratio for a cation to fit into an octahedral void is approximately 0.414. If the ratio is between 0.414 and 0.732, it indicates that the cation fits into an octahedral void, but not perfectly.
What is the coordination number of a cation in a NaCl crystal (rock salt structure) if it is in an octahedral void?
- 4
- 6
- 8
- 12
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Answer: B. 6
In the rock salt structure (NaCl), the cations (Na+) and anions (Cl-) are arranged in an alternating face-centered cubic (FCC) lattice. Each cation is octahedrally coordinated by six anions, and each anion is octahedrally coordinated by six cations. Therefore, the coordination number is 6.
In a unit cell of a metal, if atoms are found at each corner and at the center of each face, the lattice is:
- Simple cubic
- Body-centered cubic (BCC)
- Face-centered cubic (FCC)
- Hexagonal close-packed (HCP)
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Answer: C. Face-centered cubic (FCC)
A unit cell with atoms at each of the 8 corners and at the center of each of the 6 faces is characteristic of a face-centered cubic (FCC) lattice.