Question:

Which of the following statement(s) is/are correct?

Updated On: Jun 14, 2022
  • The coordination number of each type of ion in CsCl crystal is 8
  • A metal that crystallises in bcc structure has a coordination number of 12
  • A unit cell of an ionic crystal shares some of its ions with other unit cells
  • The length of the unit cell in NaCl is 552 pm. $ (r_{Na^+} = 95pm; r_{Cl^-} = 181pm $
Hide Solution
collegedunia
Verified By Collegedunia

The Correct Option is D

Solution and Explanation

(a) The unit cell of CsCl has bcc arrangement of ions in which each ion has eight oppositely charged ions around it in the nearest neighbours as
shown below :
(b) In bcc, coordination number of atom is 8
(c) In an unit cell, a comer is shared in eight unit cells and a face centre is shared between two adjacent unit cells.
(d) In NaCI unit cell; $ 2(r_{Na^+} + r_Cl^- ) = a $ $ \Rightarrow \, \, \, a = 2(95 + 181) = 552pm $ Hence, a, c, d are correct.
Was this answer helpful?
0
0

Questions Asked in JEE Advanced exam

View More Questions

Concepts Used:

Solid State

Solids are substances that are featured by a definite shape, volume, and high density. In the solid-state, the composed particles are arranged in several manners. Solid-state, in simple terms, means "no moving parts." Thus solid-state electronic devices are the ones inclusive of solid components that don’t change their position. Solid is a state of matter where the composed particles are arranged close to each other. The composed particles can be either atoms, molecules, or ions. 

Solid State

Types of Solids:

Based on the nature of the order that is present in the arrangement of their constituent particles solids can be divided into two types;

  • Amorphous solids behave the same as super cool liquids due to the arrangement of constituent particles in short-range order. They are isotropic and have a broad melting point (range is about greater than 5°C).
  • Crystalline solids have a fixed shape and the constituent particles are arranged in a long-range order.