Solid State Test

Result

Solid State Test - 79

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Weekly Quiz Competition

Question 1
1 / -0

The yellow colour or $$ZnO$$ and conducting nature produced in heating is due to

A
Metal excess of defects due to interstitial cation

B
Extral positive ions present in an interstitial site

C
Trapped electrons

D
All

Solution
Question 2
1 / -0

Packing fraction in 2D-hexagonal arrangement of identical spheres is

A
$$\cfrac { \pi }{ 3\sqrt { 2 } } $$

B
$$\cfrac { \pi }{ 3\sqrt { 3 } } $$

C
$$\cfrac { \pi }{ 2\sqrt { 3 } } $$

D
$$\cfrac { \pi }{ 6 } $$

Solution
Question 3
1 / -0

Directions For Questions

The density of crystalline $$CsCl$$ is $$3.5g/{ cm }^{ 3 }$$.
$$\left[ Cs=132.5,Cl=35.5,{ N }_{ A }=6\times { 10 }^{ 23 },{ \left( 4.3 \right) }^{ 3 }=80 \right] $$

...view full instructions

The volume effectively occupied by a single $$CsCl$$ ion pair in the crystal is?

A
$$48ml$$

B
$$8\times { 10 }^{ -23 }ml$$

C
$$3.2\times { 10 }^{ -22 }ml$$

D
$$2\times { 10 }^{ -23 }ml$$

Solution
Question 4
1 / -0

The density of crystalline $$CsCl$$ is $$3.988\ g/cc$$. The volume effectively occupied by a single $$CsCl$$ ion pair in the crystal is

A
$$7.014\times 10^{-23} cc$$

B
$$2.81\times 10^{-22} cc$$

C
$$6.022\times 10^{-23} cc$$

D
$$3.004\times 10^{-23} cc$$

Solution

In $$BCC$$ only one ion pair will be present in unit cell

$$d= \cfrac{ZM}{VN_A}$$

$$d = \dfrac {2\times 168.4}{6.023\times 10^{23} \times a^{3}} = 3.988\ g/cc$$

$$a^{3} = \dfrac {1\times 168.4}{6.023\times 3.988\times 10^{23}} = 7.011\times 10^{-23} cc$$.

Option A is correct.
Question 5
1 / -0

The crystal with $$a= b \neq c, \alpha = \beta =\gamma =90^o$$ is:

A
cubic

B
orthorhombic

C
tetragonal

D
hexagonal
Question 6
1 / -0

Which of the following characteristic features match(es) with the crystal systems: cubic and tetragonal

A
Both have the cell parameters; $$a=b=c$$ and $$\alpha =\beta =\gamma$$

B
Both belong to different crystal systems

C
Both have only two crystallographic angles of $$90^o$$

D
Both belong to same crystal system

Solution
Question 7
1 / -0

The percentage packing efficiency of the two dimensional arrangement of sphere for plane ABCDEF shown below is :

A
$$90.64\%$$

B
$$74.05\%$$

C
$$68.02\%$$

D
$$78.54\%$$

Solution
Question 8
1 / -0

In $$AgBr$$ crystal, the ion size lies in the order $$Ag^{+} < < Br^{-}$$. The $$AgBr$$ crystal should have:

A
Defectless (perfect) crystal

B
Schottky defect only

C
Frenkel defect only

D
Both Schottky and Frenkel defects

Solution

$$AgBr$$ exhibits Frenkel defect due to large difference in the size of $$Ag^{+}$$ and $$Br^{-}$$ ions.
Question 9
1 / -0

In a closed packed structure, if $$r$$ is the radius of the spherical void and $$R$$ is the radius of the spheres forming voids, the critical $$r /R$$ value of the tetrahedral void is equal to

A
$$0.155$$

B
$$0.255$$

C
$$0.414$$

D
$$0.732$$

Solution
Question 10
1 / -0

The crystal lattice of ice is mostly formed by :

A
ionic forces

B
covalent bonds

C
intramolecular H-bonds

D
covalent as well as H-bonds

Solution

Ice has hydrogen bonding and covalent bond, and intermolecular hydrogen bonds are weaker than Covalent bonds. H-O are covalent bonds. H-O are intermolecular hydrogen bonding also with other neighbouring atoms.