No products in the cart.

Unit cell is the smallest portion …

CBSE, JEE, NEET, CUET

CBSE, JEE, NEET, CUET

Question Bank, Mock Tests, Exam Papers

NCERT Solutions, Sample Papers, Notes, Videos

Unit cell is the smallest portion of a crystal lattice which, when repeated in different directions, generates the entire lattice. Generally unit cell is considered as in cubic shape. A unit cell is characterised by six parameters. Unit cells can be broadly divided into two categories, primitive and centred unit cells. When constituent particles are present only on the corner positions of a unit cell, it is called as primitive unit cell (simple). When a unit cell contains one or more constituent particles present at positions other than corners in addition to those at corners, it is called a centred unit cell (bcc, fcc and ecc). In each cell, the contribution of constituent particles at the corner is 1/8 and at the face centre is 1/2 and at the edge centre is 1/4 and at the centre of body is whole constituent atom. Q.1. How many constituent particles are present in a simple cubic unit cell? (a) 1 (b) 2 (c) 3 (d) 4 (e) 5 Q.2. How many constituent particles are present in a body centred cubic unit cell? (a) 8 (b) 6 (c) 4 (d) 2 (e) 0 Q.3. How many constituent particles are present in a face centred cubic unit cell? (a) 0 (b) 8 (c) 6 (d) 3 (e) 4 Q.4. How many parameters are of a unit cell (a) 6 (b) 4 (c) 2 (d) 0 (e) 8 Q.5. A substance is made up of two elements X and Y and crystallize in fcc. If X is present at the corners and Y present at the face centres then what will be the formula of the substance? (a) XY (b) XY4 (c) X4Y (d) X3Y4 (e) XY3
  • 0 answers
http://mycbseguide.com/examin8/

Related Questions

myCBSEguide App

myCBSEguide

Trusted by 1 Crore+ Students

Test Generator

Test Generator

Create papers online. It's FREE.

CUET Mock Tests

CUET Mock Tests

75,000+ questions to practice only on myCBSEguide app

Download myCBSEguide App