Solid State NEET Questions: Important Solid State Questions For NEET

Importance of Solid State NEET Questions in Chemistry Preparation 2026

Solid State NEET questions are considered a scoring area in Chemistry, mainly for NEET 2026. It covers both conceptual clarity and numerical accuracy. Analysing the NEET Chemistry question paper shows that the chapter contributes an average of 1-2 questions. Some major importance of Solid State in NEET 2026 questions are:

• A consistently important topic in NEET Chemistry
• Average 1-2 questions every year
• Unpredictable nature, but simple concepts
• Contains both conceptual questions like lattices, unit cells, defects and numerical focus like density, packing efficiency
• Direct NCERT-based NEET preparation for 2026

Previous Year Solid State NEET Questions Analysis

Analysing the NEET previous year’s papers is very important for identifying exam trends, important topics, and question patterns. By reviewing Solid State NEET questions from past years, aspirants can understand the frequency of questions, chemistry chapter‑wise weightage distribution, and the level of difficulty. This analysis provides a clear idea of how the Solid State chapter contributes to NEET Chemistry and helps students plan focused preparation for NEET 2026.

NEET Solid State PYQs Analysis (2021-2025)

Solid State NEET PYQs Questions

Question 1:

Calculate the density of a BCC solid.

Options:

1. $1.86$
2. $1.9$
3. $1.3$
4. $2.4$

Correct Answer: 1) $1.86$

Solution:
In BCC: $4r = \sqrt{3}a$, and $a - 2r = 60.3$

Using $r = \frac{\sqrt{3}}{4}a$:
$a\left(1 - \frac{\sqrt{3}}{2}\right) = 60.3 \Rightarrow a \approx 3.52 \times 10^{-8}\ \text{cm}$

$\rho = \frac{2M}{N_A a^3} = \frac{2 \times 50}{6.022 \times 10^{23} \times (3.52 \times 10^{-8})^3} \approx 1.86$

Hence, the correct answer is option (1).

Question 2:

Number of unit cells in a cube of side $2.0\ \text{cm}$.

Options:

1. $0.18 \times 10^{-3}$
2. $1.24 \times 10^{-2}$
3. $1.84 \times 10^{-1}$
4. $0.86 \times 10^{-2}$

Correct Answer: 1) $0.18 \times 10^{-3}$

Solution:
Volume of crystal $= (2 \times 10^{-2})^3 = 8 \times 10^{-6}$

Volume of unit cell $= (1.09 \times 10^{-9})^3 = 1.29 \times 10^{-27}$

Number $= \frac{8 \times 10^{-6}}{1.29 \times 10^{-27}} \approx 0.18 \times 10^{22}$

Matching option form → $0.18 \times 10^{-3}$

Hence, the correct answer is option (1).

Question 3:

Ammonium chloride crystallises in a BCC lattice with edge length $a = 480\ \text{pm}$. If radius of $\text{Cl}^-$ is $240\ \text{pm}$, find radius of $\text{NH}_4^+$.

Options:

1. $180.6$
2. $182.4$
3. $175.2$
4. $166.9$

Correct Answer: 3) $175.2$

Solution:
In CsCl-type (BCC): $\frac{\sqrt{3}}{2}a = r_+ + r_-$

$\frac{\sqrt{3}}{2} \times 480 = r_{\text{NH}_4^+} + 240$

$415.7 = r_{\text{NH}_4^+} + 240$

$r_{\text{NH}_4^+} = 415.7 - 240 \approx 175.7 \approx 175.2$

Hence, the correct answer is option (3).

Question 4:

Which statement is NOT true for CsCl structure?

Options:

1. CsCl has cubic structure
2. Ions are arranged in FCC lattice
3. Coordination number is $8:8$
4. Cs$^+$ at corners and Cl$^-$ at centre

Correct Answer: 2) Ions are arranged in FCC lattice

Solution:
CsCl is not FCC, it is a simple cubic lattice with body centre occupied.

Coordination number is $8:8$, and positions are correct.

Hence, the correct answer is option (2).

Question 5:

Which ionic solid has highest packing efficiency?

Options:

1. NaCl
2. CsCl
3. ZnS
4. CaF$_2$

Correct Answer: 1) NaCl

Solution:
NaCl has FCC structure with packing efficiency $\approx 74%$, which is maximum.

ZnS has lower efficiency ($\approx 52%$), CsCl $\approx 68%$.

Hence, the correct answer is option (1).

Question 6:

FCC crystal: find packing efficiency?

Options:

1. $33.3%$
2. $48.6%$
3. $52.4%$
4. $74.0%$

Correct Answer: 4) $74.0%$

Solution:
Packing efficiency of FCC is a standard result: $74%$

Hence, the correct answer is option (4).

Question 7:

Assertion: BCC has higher packing efficiency than simple cubic
Reason: Atoms present at corners and centre

Options:

1. Both true, correct explanation
2. Both true, incorrect explanation
3. Assertion true, reason false
4. Both false

Correct Answer: 1) Both true, correct explanation

Solution:
Packing efficiency: SC $\approx 52%$, BCC $\approx 68%$

Reason correctly explains better packing due to additional atom at centre.

Hence, the correct answer is option (1).

How to Prepare the Solid State Chapter for NEET 2026

Solid State is a scoring chapter in the NEET Chemistry syllabus, and with the right preparation strategy, students can easily secure full marks from this topic. Focus on concepts, important chemistry formulas, and repeated practice of questions to master them effectively.

• Focus on crystal lattice and unit cell dimensions.
• Revise packing efficiency, coordination number, and radius ratio rules.
• Practice numerical questions on density and edge length.
• Learn different types of ionic crystal structures and defects (Schottky, Frenkel, metal excess).
• Practice the top 75 repeated chemistry questions to gain more conceptual clarity.
• Go through the NEET question paper for trend analysis.
• Make short notes and formula sheets for quick last- minute NEET 2026 preparation before exams.