Choose the correct statements out of the following

Options

A. Quartz is a three dimensional silicate
B. There is no effect of density on the solid having Frenkel defect
C. Group 14 elements doped with group 13 elements produce n-type semi conductors
D. Ferrimagnetic substances possess large magnetic moment

Answer

To solve the question of identifying the correct statements, we will evaluate each statement one by one.

### Step 1: Evaluate Statement 1
**Statement:** Quartz is a three-dimensional silicate.

**Solution:** This statement is correct. Quartz is indeed a three-dimensional silicate. In quartz, the silicon and oxygen atoms are arranged in a three-dimensional network, which is characteristic of silicate minerals.

### Step 2: Evaluate Statement 2
**Statement:** There is no effect of density on the solid having the Frenkel defect.

**Solution:** This statement is also correct. In a Frenkel defect, a cation is displaced from its lattice site to an interstitial site. This means that while the position of the ions changes, the total number of ions (and thus the mass) remains the same. Therefore, the density of the solid does not change as a result of the Frenkel defect.

### Step 3: Evaluate Statement 3
**Statement:** Group 14 element doped with group 13 element produces n-type semiconductor.

**Solution:** This statement is incorrect. When a group 14 element (like silicon or germanium) is doped with a group 13 element (which is trivalent), it creates "holes" in the crystal lattice, leading to the formation of a p-type semiconductor. The charge carriers in this case are the holes, not electrons, which are characteristic of n-type semiconductors.

### Step 4: Evaluate Statement 4
**Statement:** Ferrimagnetic substances possess a large magnetic moment.

**Solution:** This statement is incorrect. Ferrimagnetic substances do not necessarily possess a large magnetic moment. In contrast, ferromagnetic substances exhibit a large magnetic moment due to the parallel alignment of magnetic moments. Ferrimagnetic materials have opposing magnetic moments that partially cancel each other out, resulting in a smaller net magnetic moment.

### Conclusion
Based on the evaluations:
- **Correct Statements:** Statement 1 and Statement 2
- **Incorrect Statements:** Statement 3 and Statement 4

### Final Answer
The correct statements are:
1. Quartz is a three-dimensional silicate.
2. There is no effect of density on the solid having the Frenkel defect.

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