Solid State Test

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Solid State Test - 80

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Weekly Quiz Competition

Question 1
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Choose the correct statement about the given figures.

A
$$(II)$$ represents solid state while $$(III)$$ represent liquid state.

B
$$(II)$$ represents solid state while $$(III)$$ represent solid state.

C
$$(I)$$ represents solid state while $$(III)$$ represent liquid state.

D
$$(I)$$ represents solid state while $$(III)$$ represent solid state.

Solution

Answer is option (B).
In liquids state water molecules are hydrogen bonded while in solid state water molecules are arranged in tetrahedral manner with open cage structure.
Question 2
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Complete the given table:

A
$$A$$ - Impurity Defect ; $$B$$ - Stoichiometric Defect ; $$C$$ - Non-Stoichiometric Defect ; $$D$$ - Anion Excess Defect

B
$$A$$ - Stoichiometric Defect ; $$B$$ - Non-Stoichiometric Defect ; $$C$$ - Impurity Defect ; $$D$$ - Metal Excess Defect

C
$$A$$ - Non-Stoichiometric Defect ; $$B$$ - Stoichiometric Defect ; $$C$$ - Impurity Defect ; $$D$$ - Cation Defect

D
$$A$$ - Impurity Defect ; $$B$$ - Stoichiometric Defect ; $$C$$ - Metal Excess Defect ; $$D$$ - Non-Stoichiometric Defect
Question 3
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Which is the effect represented by the given figure?

A
Schottky defect

B
Frenkel defect

C
Vacancy defect

D
Interstitial defect

Solution

In Frenkel defect, the smaller cation is dislocated from its normal position to an interstitial site.
Hence, Option "B" is the correct answer.
Question 4
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Amorphous solids are:

A
isotropic and supercooled liquids

B
anisotropic and supercooled liquids

C
isoenthalpic and superheated liquids

D
isotropic and superheated solids

Solution

Amorphous solids have an irregular arrangement of constituent particles. They have the same physical properties in all directions due to irregular arrangement. Hence the amorphous solids are isotropic. Here the constituent particles (atoms, molecules or ions) are scattered and disordered.

Due to irregular arrangement, they process fluidity like liquids. The structure of amorphous solids is similar to that of liquids. This type of solid melts over a range of temperatures. Hence these are also called pseudo solids or supercooled liquids.

So the correct option is A.
Question 5
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The crystal system of a compound with unit cell parameters,
$$a = 0.328 \,nm, b = 0.328 \,nm, c = 0.527 \,nm$$ and $$\alpha = \beta = \gamma = 90^\circ$$ is :

A
Cubic

B
Tetragonal

C
Monoclinic

D
Rhombohedral
Question 6
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The body centered cubic cell of chromium has a length of $$0.288 \,nm.$$ Calculate the density of chromium $$(g / cm^3)$$ : (Atomic weight : $$Cr = 52.0$$)

A
$$6.80$$

B
$$7.60$$

C
$$6.60$$

D
$$7.23$$
Question 7
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Dopping of $$AgCl$$ crystals with $$CdCl_{2}$$ results in:

A
Schottky defect

B
Frenkel defect

C
Substitutional cation vacancy

D
Formation of F-centres

Solution
Question 8
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Directions For Questions

Ionic lattice has two major points defects, (1) Schottky (2) Frenkel defects. Schottky defects occurs due to the cation-anion pair's missing from the lattice sites. Frenkel defects occurs when an ion leaves its lattice site and fits into an interstitial space. The neutrality of the crystal is being maintained and we considered all losses from interstitial positions.

...view full instructions

Structure shown here represents :

A
Schottky defect

B
Frenkel defect

C
Both defects

D
None of these

Solution
Question 9
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The radius of a divalent cation $$A^{2+}$$ is $$94 \,pm$$ and that of a divalent anion $$B^{2-}$$ is $$146 \,pm$$. The compound $$AB$$ has a/an :

A
Rock salt structure

B
Zinc blende structure

C
Antifluorite structure

D
Caesium chloride like structure

Solution
Question 10
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The fraction of volume occupied by atoms in a face centered cubic unit cell is :

A
$$0.32$$

B
$$0.48$$

C
$$0.68$$

D
$$0.74$$

Solution

$$\text { Answer: }-\text { (d) } 0.74 \\$$
$$\text { Radius of face centered cube }=\dfrac{\sqrt{2} q}{4} \\$$
$$\text { No. of atoms } / \text { unit }=4$$

Paking fraction $$=\dfrac{\dfrac{4}{3} \pi r^{3}}{a^{3}}=\dfrac{\dfrac{4}{3} \pi\left(\dfrac{\sqrt{2} a}{4}\right)^{3}}{a^{3}}=\dfrac{\pi \sqrt{2}}{6}$$

$$=0.74$$
$$=74 \%$$