JEE Chemistry The Solid State MCQs Set 24

Download JEE MCQs for JEE Chemistry: The Solid State

Access targeted multiple-choice questions for The Solid State designed to align with the latest JEE academic syllabus for JEE Chemistry. These objective practice sets help students evaluate their conceptual understanding and improve exam readiness.

Chapter-wise Objective Questions: The Solid State

Access the complete set of multiple-choice questions for The Solid State below. This focused format allows students to isolate specific topics for thorough review and uninterrupted practice alongside official JEE textbooks.

Multiple Choice Questions

Question 1: If the radius ratio is in the range 0.414 to 0.732, the coordination number will be:
(a) 2
(b) 4
(c) 6
(d) 8
Show Answer & Explanation

Answer: (c) 6

Explanation:
1. This range corresponds to octahedral voids with coordination number 6.
2. Answer: (c)

Teacher's Note:
1. Use the standard relations of the crystal lattice.
2. Check the answer against the known values for each lattice.

Question 2: In the NaCl crystal the r+/r− ratio is:
(a) 0.4
(b) 0.98
(c) 1.0
(d) 0.52
Show Answer & Explanation

Answer: (d) 0.52

Explanation:
1. r(Na+) = 95 pm and r(Cl−) = 181 pm, so the ratio is about 0.52.
2. Answer: (d)

Teacher's Note:
1. Use the standard relations of the crystal lattice.
2. Check the answer against the known values for each lattice.

Question 3: Which of the following statements is incorrect about the rock salt type structure?
(a) It has an fcc arrangement of Na+
(b) Na+ and Cl− ions have a coordination number of 6 : 6
(c) A unit cell of NaCl consists of four NaCl units
(d) All halides of alkali metals have rock salt type structure
Show Answer & Explanation

Answer: (d) All halides of alkali metals have rock salt type structure

Explanation:
1. CsCl, CsBr and CsI adopt the CsCl type structure, so (d) is incorrect.
2. (a), (b) and (c) are true.
3. Answer: (d)

Teacher's Note:
1. Use the standard relations of the crystal lattice.
2. Check the answer against the known values for each lattice.

Question 4: In sodium chloride, Cl− ions form a ccp arrangement. Which site do Na+ ions occupy in this structure?
(a) Cubic
(b) Tetragonal
(c) Octahedral
(d) Trigonal bipyramidal
Show Answer & Explanation

Answer: (c) Octahedral

Explanation:
1. Na+ ions fill all octahedral voids, giving 6 : 6 coordination.
2. Answer: (c)

Teacher's Note:
1. Use the standard relations of the crystal lattice.
2. Check the answer against the known values for each lattice.

Question 5: The positions of Cl− ions in the NaCl structure are:
(a) Corners of the cube
(b) Centres of faces of the cube
(c) Corners as well as centres of the faces of the cube
(d) Edge centres of the cube
Show Answer & Explanation

Answer: (c) Corners as well as centres of the faces of the cube

Explanation:
1. Cl− forms an fcc lattice: corners and face centres.
2. Answer: (c)

Teacher's Note:
1. Use the standard relations of the crystal lattice.
2. Check the answer against the known values for each lattice.

Question 6: The tetrahedral voids formed by the ccp arrangement of Cl− ions in the rock salt structure are:
(a) Occupied by Na+ ions
(b) Occupied by Cl− ions
(c) Occupied by either Na+ or Cl− ions
(d) Vacant
Show Answer & Explanation

Answer: (d) Vacant

Explanation:
1. Na+ fills only the octahedral voids; all tetrahedral voids remain vacant.
2. Answer: (d)

Teacher's Note:
1. Use the standard relations of the crystal lattice.
2. Check the answer against the known values for each lattice.

Question 7: The structure of MgO is similar to NaCl. The coordination number of Mg is:
(a) 2
(b) 6
(c) 4
(d) 8
Show Answer & Explanation

Answer: (b) 6

Explanation:
1. Rock salt structure gives 6 : 6 coordination.
2. Answer: (b)

Teacher's Note:
1. Use the standard relations of the crystal lattice.
2. Check the answer against the known values for each lattice.

Question 8: A unit cell of CsCl consists of:
(a) One CsCl unit
(b) Two CsCl units
(c) Four CsCl units
(d) Eight CsCl units
Show Answer & Explanation

Answer: (a) One CsCl unit

Explanation:
1. Cs+ at the body centre (1) and Cl− at corners (8 × 1/8 = 1): one formula unit.
2. Answer: (a)

Teacher's Note:
1. Use the standard relations of the crystal lattice.
2. Check the answer against the known values for each lattice.

Question 9: TlCl has a structure similar to CsCl. The coordination number of Tl+ is:
(a) 4
(b) 6
(c) 10
(d) 8
Show Answer & Explanation

Answer: (d) 8

Explanation:
1. CsCl type structure has 8 : 8 coordination.
2. Answer: (d)

Teacher's Note:
1. Use the standard relations of the crystal lattice.
2. Check the answer against the known values for each lattice.

Question 10: The coordination numbers of Zn2+ and S2− ions in the zinc blende (ZnS) type structure are:
(a) 4 : 4
(b) 6 : 6
(c) 8 : 8
(d) 4 : 8
Show Answer & Explanation

Answer: (a) 4 : 4

Explanation:
1. Zn2+ occupies half the tetrahedral voids of an fcc S2− lattice; each ion has 4 neighbours: 4 : 4.
2. Answer: (a)

Teacher's Note:
1. Use the standard relations of the crystal lattice.
2. Check the answer against the known values for each lattice.

Question 11: The number of formula units in a unit cell of fluorite (CaF2) is:
(a) 2
(b) 4
(c) 6
(d) 8
Show Answer & Explanation

Answer: (b) 4

Explanation:
1. Ca2+ forms fcc (4 per cell) and F− fills 8 tetrahedral voids: 4 CaF2 units.
2. Answer: (b)

Teacher's Note:
1. Use the standard relations of the crystal lattice.
2. Check the answer against the known values for each lattice.

Question 12: 4 : 4 coordination is found in:
(a) ZnS
(b) CuCl
(c) AgI
(d) All of these
Show Answer & Explanation

Answer: (d) All of these

Explanation:
1. ZnS, CuCl and AgI all adopt the zinc blende structure with 4 : 4 coordination.
2. Answer: (d)

Teacher's Note:
1. Use the standard relations of the crystal lattice.
2. Check the answer against the known values for each lattice.

Question 13: The radius of Na+ is 95 pm and that of Cl− is 181 pm. The coordination number of Na+ will be:
(a) 4
(b) 6
(c) 8
(d) 12
Show Answer & Explanation

Answer: (b) 6

Explanation:
1. r+/r− = 95/181 = 0.525, in the range 0.414 to 0.732.
2. Coordination number 6.
3. Answer: (b)

Teacher's Note:
1. Use the standard relations of the crystal lattice.
2. Check the answer against the known values for each lattice.

Question 14: The ionic radii of Rb+ and I− are 1.46 and 2.16 Å respectively. The most probable type of structure exhibited by it is:
(a) CsCl type
(b) NaCl type
(c) ZnS type
(d) CaF2 type
Show Answer & Explanation

Answer: (b) NaCl type

Explanation:
1. Radius ratio = 1.46/2.16 = 0.676, between 0.414 and 0.732.
2. Octahedral coordination: NaCl type.
3. Answer: (b)

Teacher's Note:
1. Use the standard relations of the crystal lattice.
2. Check the answer against the known values for each lattice.

Question 15: A binary solid (A+B−) has a rock salt structure. If the edge length is 400 pm and the radius of the cation A+ is 75 pm, the radius of the anion B− is:
(a) 100 pm
(b) 125 pm
(c) 250 pm
(d) 325 pm
Show Answer & Explanation

Answer: (b) 125 pm

Explanation:
1. Along the edge: a = 2(r+ + r−).
2. 400 = 2(75 + r−), so r− = 125 pm.
3. Answer: (b)

Teacher's Note:
1. Use the standard relations of the crystal lattice.
2. Check the answer against the known values for each lattice.

Question 16: A solid XY has a bcc structure. If the distance of closest approach between the two atoms is 173 pm, the edge length of the cell is:
(a) 200 pm
(b) √3/√2 pm
(c) 142.2 pm
(d) √2 pm
Show Answer & Explanation

Answer: (a) 200 pm

Explanation:
1. In the CsCl-type (bcc) arrangement the closest distance is half the body diagonal: √3 a/2.
2. a = 2 × 173/√3 = 200 pm.
3. Answer: (a)

Teacher's Note:
1. Use the standard relations of the crystal lattice.
2. Check the answer against the known values for each lattice.

Question 17: If the distance between Na+ and Cl− ions in a NaCl crystal is 'a' pm, the length of the cell edge is:
(a) 2a pm
(b) a/2 pm
(c) 4a pm
(d) a/4 pm
Show Answer & Explanation

Answer: (a) 2a pm

Explanation:
1. Na+-Cl− contact is along the edge: edge = 2(r+ + r−) = 2a.
2. Answer: (a)

Teacher's Note:
1. Use the standard relations of the crystal lattice.
2. Check the answer against the known values for each lattice.

Question 18: Potassium fluoride has the NaCl-type structure. The distance between K+ and F− if its cell edge is 'a' cm is:
(a) 2a cm
(b) a/2 cm
(c) 3a cm
(d) a/4 cm
Show Answer & Explanation

Answer: (b) a/2 cm

Explanation:
1. Edge = 2(r+ + r−), so the interionic distance is a/2.
2. Answer: (b)

Teacher's Note:
1. Use the standard relations of the crystal lattice.
2. Check the answer against the known values for each lattice.

Question 19: The density of crystalline sodium chloride is 5.85 g cm−3. The edge length of the unit cell is:
(a) 4.06 × 10−8 cm
(b) 1.32 × 10−14 cm
(c) 7.8 × 10−23 cm
(d) 9.6 × 10−24 cm
Show Answer & Explanation

Answer: (a) 4.06 × 10−8 cm

Explanation:
1. a3 = 4 × 58.5/(5.85 × 6.022 × 1023) = 6.64 × 10−23 cm3.
2. a = 4.05 × 10−8 cm ≈ 4.06 × 10−8 cm.
3. Answer: (a)

Teacher's Note:
1. Use the standard relations of the crystal lattice.
2. Check the answer against the known values for each lattice.

Question 20: A unit cell of sodium chloride has four formula units. The edge length of the unit cell is 0.6 nm. The density of sodium chloride is:
(a) 7.60 g cm−3
(b) 1.80 g cm−3
(c) 9.60 g cm−3
(d) 6.38 g cm−3
Show Answer & Explanation

Answer: (b) 1.80 g cm−3

Explanation:
1. a = 6 × 10−8 cm, a3 = 2.16 × 10−22 cm3.
2. ρ = 4 × 58.5/(6.022 × 1023 × 2.16 × 10−22) = 1.80 g cm−3.
3. Answer: (b)

Teacher's Note:
1. Use the standard relations of the crystal lattice.
2. Check the answer against the known values for each lattice.

Question 21: At zero kelvin, most ionic crystals possess:
(a) Frenkel defect
(b) Schottky defect
(c) Metal excess defect
(d) No defect
Show Answer & Explanation

Answer: (d) No defect

Explanation:
1. Point defects arise from thermal energy; at 0 K a perfect crystal is expected.
2. Answer: (d)

Teacher's Note:
1. Use the standard relations of the crystal lattice.
2. Check the answer against the known values for each lattice.

Question 22: As a result of a Schottky defect:
(a) There is no effect on the density
(b) The density of the crystal increases
(c) The density of the crystal decreases
(d) Any of the above three can happen
Show Answer & Explanation

Answer: (c) The density of the crystal decreases

Explanation:
1. Pairs of cations and anions leave the lattice, so mass falls at constant volume and density decreases.
2. Answer: (c)

Teacher's Note:
1. Use the standard relations of the crystal lattice.
2. Check the answer against the known values for each lattice.

Question 23: Frenkel defect is generally observed in:
(a) AgBr
(b) AgI
(c) ZnS
(d) All of these
Show Answer & Explanation

Answer: (d) All of these

Explanation:
1. Frenkel defect needs a small cation and large difference in ion sizes; AgBr, AgI and ZnS all show it.
2. Answer: (d)

Teacher's Note:
1. Use the standard relations of the crystal lattice.
2. Check the answer against the known values for each lattice.

Question 24: F-centres in an ionic crystal are:
(a) Lattice sites containing electrons
(b) Interstitial sites containing electrons
(c) Lattice sites that are vacant
(d) Interstitial sites containing cations
Show Answer & Explanation

Answer: (a) Lattice sites containing electrons

Explanation:
1. An F-centre is an anion vacancy (a lattice site) occupied by an electron.
2. Answer: (a)

Teacher's Note:
1. Use the standard relations of the crystal lattice.
2. Check the answer against the known values for each lattice.

Question 25: The correct statement regarding F-centre is:
(a) Electrons are held in the lattice site of crystals
(b) F-centre imparts colour to the crystal
(c) Conductivity of the crystal increases due to F-centre
(d) All the three above
Show Answer & Explanation

Answer: (d) All the three above

Explanation:
1. All three are true: trapped electrons occupy anion sites, absorb visible light (colour) and add some electrical conductivity.
2. Answer: (d)

Teacher's Note:
1. Use the standard relations of the crystal lattice.
2. Check the answer against the known values for each lattice.

Question 26: The coordination number in hcp is:
(a) 6
(b) 8
(c) 12
(d) 18
Show Answer & Explanation

Answer: (c) 12

Explanation:
1. hcp has coordination number 12.
2. Answer: (c)

Teacher's Note:
1. Use the standard relations of the crystal lattice.
2. Check the answer against the known values for each lattice.

Question 27: An alloy of copper, silver and gold is found to have copper constituting the fcc lattice. If silver atoms occupy the edge centres and gold is present at the body centre, the alloy has the formula:
(a) Cu4Ag2Au
(b) Cu4Ag4Au
(c) Cu4Ag3Au
(d) CuAgAu
Show Answer & Explanation

Answer: (c) Cu4Ag3Au

Explanation:
1. Cu in fcc: 4 per cell.
2. Ag at 12 edge centres: 12 × 1/4 = 3.
3. Au at body centre: 1.
4. Formula Cu4Ag3Au.
5. Answer: (c)

Teacher's Note:
1. Use the standard relations of the crystal lattice.
2. Check the answer against the known values for each lattice.

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Practice MCQs for JEE Chemistry The Solid State

JEE Chemistry The Solid State Objective Test Questions

Test your conceptual understanding of The Solid State with these targeted multiple-choice questions. Designed in alignment with the latest JEE curriculum for JEE Chemistry, these problem sets build accuracy and prepare students for objective exams.

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Each question includes structured solution keys mapped directly to standard JEE textbooks, helping students evaluate their reasoning and correct mistakes early in their revision.

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