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Free Solids MCQs with Answers

357 Solids MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.

Solids are classified by particle arrangement and bonding into crystalline, ionic and molecular forms. Questions cover crystal lattices, the shapes and properties of ionic crystals, and lattice energy, including how ion charge and ionic size affect the strength of attractions within an ionic solid.

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Crystalline SolidsShape of Ionic CrystalsIonic and Molecular CrystalsCrystal LatticeLattice Energy
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357 questions · page 13 of 18

241. The nature of Binding Force in Ionic Crystals is

  • A. Magnetic
  • B. Repulsive
  • C. Electrostatic
  • D. Weak

Explanation: An ionic crystal consists of ions bound together by electrostatic attraction.

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Correct answer: Electrostatic

242. NaCl and CsF have same geometry because they have the same _ ?

  • A. Ionization energy
  • B. Ionic radius ratio
  • C. Electron affinity
  • D. Bond length

Explanation: NaCl and CsF have the same geometry because they have the same ionic radius ratio.

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Correct answer: Ionic radius ratio

243. Coordination number of Na in NaCl is _

  • A. 4
  • B. 6
  • C. 8
  • D. 3

Explanation: In NaCl (sodium chloride), each Na ion is surrounded by six chloride (Cl) ions, and each Cl ion is surrounded by six sodium (Na) ions.

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Correct answer: 6

244. Brittleness of ionic solids is due to the fact that ions arrange themselves in a way to _ each other.

  • A. Attract
  • B. Compress
  • C. Repel
  • D. Overlap

Explanation: To an ionic compound when a force is applied, like charges in the lattice come together due to the force applied and repel each other…

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Correct answer: Repel

245. CI-Cl Bond distance is 5.63 A, while the NaCl bond distance is

  • A. Half of 5.63
  • B. Double to 5.63
  • C. 5.63
  • D. None of these

Explanation: Option A is correct since, in a chlorine molecule, chlorine exists as atoms.

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Correct answer: Half of 5.63

246. Cesium in cesium chloride has the coordination number:

  • A. 6
  • B. 8
  • C. 4
  • D. 5

Explanation: Cesium in cesium chloride has the coordination number 8.

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Correct answer: 8

247. In crystal structure of NaCl, the arrangement of Cl- ions is:

  • A. Face centered cubic
  • B. Body centered cubic
  • C. Simple Cubic
  • D. Hexagonal

Explanation: Option A is correct.The arrangement of Cl- ions in the crystal structure of NaCl is face centered cubic.

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Correct answer: Face centered cubic

248. The number of Cl- ions per unit cell of a simple cubic lattice at the corner is/are:

  • A. 1
  • B. 3
  • C. 4
  • D. 6

Explanation: - In a simple cubic lattice, each corner is shared by eight adjacent unit cells.- Each corner atom/ion contributes (1/8) to the unit cell…

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Correct answer: 1

249. Antifluorite structure is derived from fluorite structure by:

  • A. Heating fluorite crystal lattice
  • B. Subjecting fluorite structure to high pressure
  • C. Interchanging the positions of positive and negative ions in the lattice
  • D. Introducing the impurities to the lattice

Explanation: Since the CN of Fluorite and Antifluorite structure are same, hence by interchanging the positions of cation and anions lattice can be…

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Correct answer: Interchanging the positions of positive and negative ions in the lattice

250. A solid AB2 has fluorite type structure (CaF2). If all the atoms along one of the tetrad axes is removed, then formula of the solid will be:

  • A. A2B5
  • B. A3B8
  • C. A3B5
  • D. A5B8

Explanation: Following is the solution of this problem:

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Correct answer: A3B8

251. If the distance between Na+ and Cl- ions in NaCl crystal is 265 pm, then edge length of the unit cell will be:

  • A. 265 pm
  • B. 530 pm
  • C. 795 pm
  • D. 132.5 pm

Explanation: As we know, Edge length = 2 x distance between Na+ & Cl- Edge length = 2 x 265 = 530 pm Hence, option B is correct.

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Correct answer: 530 pm

252. X+Y- crystallizes in a bcc lattice in which the radius of X+ is 0.4 Å. If all the X+ ions are removed and another cation Z+ is inserted, what should be the maximum radius of the cation Z+ to crystallize in a fcc lattice with Y?

  • A. 0.548 Å
  • B. 0.010 Å
  • C. 0.400 Å
  • D. 0.226 Å

Explanation: Following is the solution of this question:

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Correct answer: 0.226 Å

253. NH4Cl crystallizes in a body-centred cubic lattice with edge length of unit cell equal to 387 pm. If the radius of the Cl− ion is 181 pm, radius of NH4+ ion is:

  • A. 154.1 pm
  • B. 92.6 pm
  • C. 366.3 pm
  • D. None of these

Explanation: In body centred cubic lattice, oppositely charged ions touch each other along the cube.

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Correct answer: 154.1 pm

254. Edge length M+X- (fcc structure) is 7.2 Å. Assuming M+ and X− contact along the cell edge, radius of X− ion is: (rM+=1.6 Å)

  • A. 2.0 Å
  • B. 5.6 Å
  • C. 2.8 Å
  • D. 3.8 Å

Explanation: Following is the solution of this problem:

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Correct answer: 2.0 Å

255. The coordination number of each ion in NaCl is:

  • A. 4
  • B. 8
  • C. 6
  • D. 10

Explanation: In NaCl, each Na+ ion surrounded by six Cl- ions and each Cl- ion is surrounded by six Na+ ions.

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Correct answer: 6

256. Predict the shape of CsCl having a radius ratio of 0.93:

  • A. Tetrahedral
  • B. Octahedral
  • C. Body-centered cubic
  • D. Hexagonal

Explanation: CsCl adopts a body-centered cubic (bcc) arrangement where each Cs⁺ ion is surrounded by 8 Cl⁻ ions and vice versa, giving a coordination…

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Correct answer: Body-centered cubic

257. A crystal system having all sides (a, b and c) unequal and angles α = β = γ = 90 is:

  • A. Cubic
  • B. Rhombohedral
  • C. Orthorhombic
  • D. Hexagonal

Explanation: This is correct because an orthorhombic system has all three sides unequal (a ≠ b ≠ c), but all angles are 90° (α = β = γ = 90°).

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Correct answer: Orthorhombic

258. A solid AB2 has a fluorite-type structure (CaF2). If all the atoms along one of the tetrad axes are removed, then the formula of the solid will be:

  • A. A2B5
  • B. A3B8
  • C. A3B5
  • D. A5B8

Explanation: Following is the solution of this problem:

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Correct answer: A3B8

259. If the distance between Na+ and Cl- ions in NaCl crystal is 265 pm, then the edge length of the unit cell will be:

  • A. 265 pm
  • B. 530 pm
  • C. 795 pm
  • D. 132.5 pm

Explanation: In the face-centered cubic (FCC). structure of NaCl, the edge length (a) of the unit cell is twice the distance between adjacent ions.

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Correct answer: 530 pm

260. An element 'A' has a face-centred cubic structure with edge length equal to 361 pm. The apparent radius of atom 'A' is :

  • A. 127.6 pm
  • B. 180.5 pm
  • C. 160.5 pm
  • D. 64 pm

Explanation: Following is the solution to this problem:

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Correct answer: 127.6 pm
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