Chemistry Class Twelve

Skip Navigation Links.


 

Solid State

NCERT Exercise Solution (part 3)

Question – 1.11 – Silver crystallizes in fcc lattice. If edge length of the cell is 4.07 x 10– 8 cm and density is 10.5 g cm– 3. Calculate the atomic mass of silver.

Solution:

class 12 solid state ncert exercise solution10
class 12 solid state ncert exercise solution11
class 12 solid state ncert exercise solution12

Question – 1.12 - A cubic solid is made of two elements P and Q. Atoms of Q are at the corners of the cube and P at the body-centre. What is the formula of the compound? What are the coordination numbers of P and Q?

Solution:

Given, Atoms of Q are at the corners of the cube and P at the body-centre.

class 12 solid state ncert exercise solution13

Number of atoms of P in one unit cell = 1

class 12 solid state ncert exercise solution14

Question – 1.13 - Niobium crystallises in body-centred cubic structure. If density is 8.55 g cm–3, calculate atomic radius of niobium using its atomic mass 93 u.

Solution:

class 12 solid state ncert exercise solution15
class 12 solid state ncert exercise solution16
class 12 solid state ncert exercise solution17

Thus atomic radius of niobium = 14.31 nm

Question – 1.14 - If the radius of the octahedral void is r and radius of the atoms in close packing is R, derive relation between r and R.

Solution:

class 12 solid state ncert exercise solution18

In the given figure, let an sphere having centre ‘O’ is fitted in the octahedral void.

As given, radius of the sphere fitted in the octahedral void = r

And radius of the atoms in close packing = R

class 12 solid state ncert exercise solution19

This is the required relation between r and R.


Previous            Next
Solid State - Introduction
Solid State - Crystal Lattice
Solid State - Close Packing Structure
Solid State - Efficiency of Close Packing Structure - 1
Solid State - Efficiency of Close Packing Structure - 2
Solid State - Imperfections in Solids - Crystal Defects
Solid State - Electrical and Magnetic Properties
Solid State - NCERT In Text Solution 1
Solid State - NCERT In Text Solution 2
Solid State - NCERT In Text Solution 3
Solid State - NCERT Exercise Solution (Part 1)
Solid State - NCERT Exercise Solution (Part 2)
Solid State - NCERT Exercise Solution (Part 4)
Solid State - NCERT Exercise Solution (Part 5)

 
                 Aesop's Fables - Story for kids
Skip Navigation Links
googlesitemapwizard.com Sitemap Generator