CBSE Class 12 Chemistry Solid State Worksheet

Comprehension Based

Paragraph–I

A gold single crystal has a cubic shape and the dimension of the cube is, a = 1.000cm. When irradiated with Cu Ka X-rays(λ =154.05pm) at the angle θ of 10.89° is gives a well-defined first-order diffraction pattern. The atomic weight of Au is MAu = 196.97g mol–1.

Question. How many gold mass are in the cube?
a. 5.904×10²²
b. 5.904×10²⁰
c. 5.904×10¹⁸
d. 5.904×10¹⁶
Answer : A

Question. What is the mass of the unit cell of gold?
a. 1.308x10⁻¹⁹
b. 1.308x10⁻²¹
c. 1.308x10⁻¹⁷
d. 1.308x10⁻¹⁵
Answer : B

Question. What is the density of gold?
a. 29.31g / cm³
b. 26.29g / cm³
c. 14.21g / cm³
d. 19.31g / cm³
Answer : D

Paragraph–II
A spinel is an important class of oxides consisting of two types of metal ions with the oxide ions arranged in ccp layers. The normal spinel has non-eight of the tetrahedral holes occupied by one type of metal ion and one-half of the octahedral holes occupied by another type of metal ion.

Question. Type of hole occupied by Al3+ ions is:
a. tetrahedral
b. octahedral
c. both a. and b.
d. none of these
Answer : B

Question. Type of hole occupied by Mg2+ ions is:
a. tetrahedral
b. octahedral
c. both (a) and (b)
d. none of thes
Answer : A

Match the Column

Question. Match the crystal system/unit cells listed in Column-I with their characteristics features in Column-II:

a. A→1,4; B→2; C→2; D→2,3
b. A→2; B→2; C→3,4; D→4
c. A→1; B→3,4; C→2,3; D→4
d. A→3; B→1,2; C→3,4; D→2
Answer : A

Question. Match the statement of Column I with those in Column II:

a. A→1,2,3,4; B→1,2,4; C→1,2,4; D→1,2,3
b. A→1,4; B→1,2; C→1,2,4; D→1,2,3
c. A→2,3,4; B→2,4; C→1,2,4; D→1,2,3
d. A→4; B→2,4; C→1,4; D→1,3
Answer : A

Question. Match the statement of Column I with those in Column II:

a. A→2; B→1,3; C→4; D→2,3
b. A→1,3; B→1,2; C→2; D→3
c. A→2,3; B→1,4; C→2; D→2,3
d. A→3,4; B→4; C→2,3; D→3
Answer : C

Question. Match the statement of Column I with those in Column II:

a. A→4; B→5; C→1; D→2; E→6; F→3
b. A→3; B→5; C→2; D→4; E→1; F→6
c. A→5; B→4; C→2; D→1; E→6; F→3
d. A→6; B→3; C→1; D→5; E→2; F→4
Answer : A
 

Integer

Question. The structure of diamond and silicon is same and can be described as atoms taking corners faces of a cube and also taking position of alternate tetrahedral voids. What is the

Answer : 145

Question. The crystal of a solid is square packing of identical spheres in each layer and spheres of one layer are placed just above the voids made by spheres in previous layer. 
The packing efficiency of such crystal (in %) is:
[π = 3.15, √2 = 1.4]

Answer : 75

Question. AB crystallizes in a rock salt structure with A : B = 1 : 1. The shortest distance between A and B is Y^1/3 nm. The formula mass of AB is 6.023 Y amu where Y is any arbitrary constant. The density in kg m^–3 ?
Answer : 5

Question. If the radius of Mg²⁺ ion, Cs⁺ ion, O^2–ion, S2– ion and Cl^– ion are 0.65Å, 1.69Å, 1.40Å, 1.84Å and 1.81Å respectively.
Find the value of x + y − z where x,y,z=co-ordination numbers of the cations in the crystals of MgS, MgO and CsCl ?
Answer : 2

Question. The two ions A+ and B– have radii 88 and 200 pm respectively. In the closed packed crystal of compound AB, the co-ordination number of A⁺ is:
Answer : 6

Question. A compound AB crystallizes in rock salt structure. The ionic radius of A+ and B– are 60 pm and 100 pm respectively and if atomic masses of A and B are 200 and 120 respectively then calculate the value of x if density of the crystal = x/3.2 gm/cm³. Given 1 amu 1.6 x 10^-24 gm?
Answer : 200

Question. The average total number of ions in sphalerite structure per unit cell if there is a Shottky defects of (1) anion per unit cell:
Answer : 6

Question. A metal ‘M’ having atomic mass 31.25 crystallizes in cubic close packing and it shows “Schottky defects”. If the edge length of the cubic lattice is 500 pm and density of the metal is 1.6075 gm/ml then the number of moles of metal atom ‘M’ missing litre of the crystal. Given 1 amu 1.67 x 10^-24 gm
Answer : 2

Question. X-ray analysis of a Mn – Si alloy with 75 atomic percent of Mn showed that the unit cell is cubic and the lattice parameter, a = 2.86Å. The density of the alloy is 6.85 g/c.c. The total number of atoms in the unit cell is:
(Mutliply your answer by 10)
Answer : 5

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