Crystal Lattice

Crystal Lattice MDCAT MCQs with answers

14 past paper MCQs on Crystal Lattice, from the Solids unit of MDCAT Chemistry. The year each question appeared is shown where known; tap “Show answer” for the correct option and a short solution.

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1.The smallest block which carries the whole information about a crystal structure is called the: (MDCAT 2022)

  1. cell
  2. unit cell
  3. crystal lattice
  4. crystal unit
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Correct answer: (b) unit cell

Repeating the unit cell in three dimensions builds the whole lattice.

2.In graphite the carbon atoms are arranged in which of the following structures? (MDCAT 2024)

  1. rhombic
  2. hexagonal
  3. tetragonal
  4. trigonal
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Correct answer: (b) hexagonal

Each layer of graphite is a sheet of hexagons of $sp^2$ carbon atoms.

3.In a unit cell of a crystal lattice the angle β is between faces: (UHS MDCAT 2025)

  1. a and b
  2. b and c
  3. c and a
  4. not specified
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Correct answer: (c) c and a

By convention $\alpha$ lies between b and c, $\beta$ between c and a, and $\gamma$ between a and b.

4.The shape of the crystal lattice depends upon: (NUMS MDCAT 2025)

  1. Size of particles
  2. Nature of particles
  3. Arrangement of particles
  4. Size of unit cell
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Correct answer: (c) Arrangement of particles

The lattice is defined by how the particles are ordered in space.

5.The smallest repeating pattern from which the lattice is built in a crystalline solid is called (SZABMU MDCAT 2025)

  1. Crystallite
  2. Amorphous region
  3. Unit cell
  4. Crystal lattice
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Correct answer: (c) Unit cell

The unit cell is the smallest block whose repetition builds the whole lattice.

6.Q.81 A small building block which belongs to whole information about crystal structure is called? (UHS MDCAT 2023)

  1. Cell
  2. Unit Cell
  3. Crystal lattice
  4. Crystal unit
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Correct answer: (b) Unit Cell

The unit cell is the smallest block that carries the whole pattern of the crystal.

7.Which statement correctly describes the structure of sodium chloride crystal? (NUMS MDCAT 2023)

  1. Each sodium ion is surrounded by six chloride ions and each chloride ions surrounded by six sodium ions
  2. The crystal is face centered cubic structure
  3. Each sodium ion is surrounded by 3 chloride ions and each chloride ion surrounded by 3 sodium ions
  4. Inter molecular forces are present between two oppositely charges ions
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Correct answer: (a) Each sodium ion is surrounded by six chloride ions and each chloride ions surrounded by six sodium ions

Each ion in rock salt is at the centre of an octahedron of six of the other kind.

8.Co-ordination number of Na is: (NUMS MDCAT 2023)

  1. 10
  2. 9
  3. 8
  4. 12
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Correct answer: (c) 8

Sodium is body centred cubic, so each atom has eight nearest neighbours.

9.Position of atoms in molecular crystals can be determined by: (PMC MDCAT 2022)

  1. X-rays analysis
  2. Spectroscopic analysis
  3. Spectrometric analysis
  4. Combustlon analysis
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Correct answer: (a) X-rays analysis

X-ray diffraction is what reveals the arrangement of the atoms in a crystal.

10.What shapes does diamond and NaCl unit cells possess? (PMC MDCAT 2022)

  1. NaCl monoclinic and diamond cubic
  2. NaCl cubic and diamond rhombic
  3. Both are cubic
  4. Both are rectangular
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Correct answer: (c) Both are cubic

Both crystallize in the cubic system.

11.The array of points which shows the atoms ions or molecule arrangements in a crystal is called. (PMC MDCAT 2022)

  1. Crystal system
  2. Crystal lattice
  3. Crystal array
  4. Crystallography
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Correct answer: (b) Crystal lattice

The regular array of points representing the particles is the crystal lattice.

12.The smallest part of the crystal lattice has all the properties of the entire crystal, this is called: (PMC Practice 2021)

  1. Unit
  2. Unit cell
  3. Unit crystal
  4. All of these options are correct
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Correct answer: (b) Unit cell

The smallest block that carries the whole pattern of the crystal is the unit cell.

13.Lattice points are also called? (PMC Practice 2021)

  1. Space lattice
  2. Crystal lattice
  3. Lattice sites
  4. Lattice location
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Correct answer: (c) Lattice sites

The points of the lattice at which the particles sit are the lattice sites.

14.In the NaCl crystal, chloride ions present at the face center are distributed in: (PMC Practice 2021)

  1. One Unit Cell
  2. 8 Unit Cells
  3. 4 Unit Cells
  4. 2 Unit Cells
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Correct answer: (d) 2 Unit Cells

An ion on a face is shared between the two cells that meet at it.

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