Dimensions of Unit Cells, Class 12 Chemistry NCERT Solutions

1. There will be total 10 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying

1. If an element crystallizes as a simple cube, what is the volume of an element provided its density is 1.5 g/cm³ and atomic mass of the element is 63?

 69.7 x 10 ^-23 cm³

 6.97 x 10 ^-23 cm³

  .63 x 10 ^-23 cm³

 5.97 x 10 ^-23 cm³

Question 1 of 10

2. Mass of an atom in an unit cell is calculated by which of the following formula if M is the molar mass:

 A

 B

 C

 D

Question 2 of 10

3. In the frmula to calculate the density of a unit cell what is z ?

  Volume of unit cell.

 Number of atoms in a unit cell.

 Mass of atoms in a unit cell.

 Molar mass of unit cell.

Question 3 of 10

4. Volume of a body centred cubic unit cell is

 A

 B

 C

 D

Question 4 of 10

5. Density of a unit cell is equal to mass of unit cell divided by

 volume of 4 unit cells.

  volume of unit cell.

 volume of one molecule.

 volume of an atom.

Question 5 of 10

6. Volume of a face centred cubic unit cell is:

 A

 B

 C

 D

Question 6 of 10

7. The number of atoms (z) in simple cubic unit cell is

 one

  two

  three

 four

Question 7 of 10

8. X-ray diffraction studies show that copper crystallizes in an fcc unit cell with cell edge of 3.608 x 10^-8 cm. In a separate experiment, copper is determined to have a density of 8.92 g/cm³, calculate the atomic mass of copper.

 87.3 g/mol

 15.8 g/mol

 63.1 g/mol

 36.0 g/mol

Question 8 of 10

9. An element with bcc geometry has atomic mass 50 and edge length 290 pm. The density of unit cell will be

 8.16 g/cm³

 6.81 g/cm³

 68.1 g/cm³

 1.86 g/cm³

Question 9 of 10

10. Sodium atom crystallizes in bcc lattice with cell edge (a) = . The radius of sodium atom will be:

 A

 B

 C

 D

Question 10 of 10

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