Solid State Test

Result

Solid State Test - 9

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Weekly Quiz Competition

Question 1
1 / -0

Amorphous form of silica is

A
tridymite

B
cristobalite

C
fumed silica

D
asbestos

Solution

Fumed silica, also known as pyrogenic silica because it is produced in a flame, consists of microscopic droplets of amorphous silica fused into branched, chainlike, three-dimensional secondary particles which then agglomerate into tertiary particles.

Tridymite is a high-temperature polymorph of silica and usually occurs as minute tabular white or colorless pseudo-hexagonal crystals.
The mineral cristobalite is a high-temperature polymorph of silica that has the same chemical formula as quartz, SiO₂, but a distinct crystal structure.
Asbestos is a set of six naturally occurring silicate minerals, which exist in the form of long, thin fibrous crystals.
Question 2
1 / -0

In a face centered cubic lattice, a unit cell is shared equally by how many unit cells?

A
2

B
4

C
6

D
8

Solution

Each unit cell shared by 6 unit cells.
Question 3
1 / -0

The particles, when placed in adjacent rows, show a horizontal as well as vertical alignment and form squares. This type of packing is known as

A
hexagonal close packing

B
square close packing

C
cubic close packing

D
Both 2 and 3

Solution

When building the three dimensional lattice, the centres of the spheres are aligned vertically as well as horizontally. This packing is then known as square close packing.
Question 4
1 / -0

Find the respective coordination numbers of cations and anions in calcium fluoride structure.

A
4 and 4

B
4 and 8

C
8 and 4

D
6 and 6

Solution

Simple ionic structures are described by two coordination numbers, one for each type of ion. Calcium fluoride (CaF₂) is an (8, 4) structure, meaning that each cation Ca²⁺ is surrounded by eight F^- anion neighbours, and each anion F^- by four Ca²⁺.
Question 5
1 / -0

The coordination number of barium ions (Ba²⁺) in barium fluoride (BaF₂) is 8. What must be the coordination number of fluoride ions?

A
2

B
4

C
8

D
6

Solution

The coordination number of barium ions tells us that it is surrounded by eight fluoride ions (charge 8 ×(–1) = –8). In order to balance out the eight negative charges, we need four barium ions (charge 4 ×(+2) = +8). Hence, the coordination number of the fluoride ions must be 4.