Crystalline and Amorphous Solid

Q. Which one of the following allotropc forms of carbon is isomorphous with crystalline silicon?

1. Graphite
2. Coal
3. Coke
4. Diamond

Q. Which among the following will show anisotropy?

Q. Which among the following can be categorized as a crystalline solid?

1. Glass
2. Carbon black
3. Resin
4. Silver

Q. Position of octahedral voids in fcc structure is:

Q.

The structure of solids is studied by :-

1. X-rays

2. $\gamma$-rays

3. Cosmic rays

4. Infrared rays

Q. Which of the following is not a characteristic of a crystalline solid?

1. Definite and characteristic heat of fusion.
2. Isotropic nature.
3. A regular periodically repeated pattern of arrangement of constituentparticles in the entire crystal.
4. A true solid

Q. At ${100}^{\circ }C,$ copper $\left(Cu\right)$ has fcc unit cell structure with cell edge length of $x\stackrel{\circ }{A}$ . what is the approximate density of Cu $\left(\text{in g}c{m}^{-3}\right)$ at this temperature? [Atomic mass of $Cu$ $=63.55u]$
(JEE Main 2019)

1. $\frac{422}{x^3}$
2. $\frac{211}{x^3}$
3. $\frac{105}{x^3}$
4. $\frac{205}{x^3}$

Q.

Which of the following are properties of Crystalline solids?

1. They have a sharp melting point

2. They are anisotropic in nature

3. The arrangement order of particles is of long range order

4. It consists of a large number of small crystals each of which has the same regular pattern or arrangement of particles.

Q. An element (at. Wt. = 50) crystallises in FCC lattice, with a = 0.50 nm. What is the density of the unit cell if it contains 0.25% Schottky defects? $(use{N}_A=6\times {10}^{23})$ (a = Edge length of the unit cell)

1. $2.0\text{g/cc}$
2. $2.66\text{g/cc}$
3. $3.06\text{g/cc}$
4. None of these

Q. The total number of octahedral void(s) per atom present in a cubic close packed structure is:
(AIPMT 2012)

Q. Which of the following is true regarding amorphous solids?

1. do not undergo clean cleavage when cut with a knife
2. undergo clean cleavage when cut with knife
3. posses sharp melting points
4. posses orderly arrangement over long distances

Q.

A crystalline solid

[Kerala CET (Med.) 2003]

1. Changes abruptly from solid to liquid when heated

2. Has no definite melting point

3. Undergoes deformation of its geometry easily

4. Has an irregular 3-dimensional arrangements

5. Softens slowly

Q. A compound of formula $A_2{B}_3$ has the hcp lattice. Which atom forms the hcp lattice and what fraction of tetrahedral voids is occupied by the other atoms?
(JEE Main 2019)

1. $\text{hcp lattice - A,}\frac{1}{3}\text{Tetrahedral voids- B}$
2. $\text{hcp lattice - B,}\frac{1}{3}\text{Tetrahedral voids- A}$
3. $\text{hcp lattice - A,}\frac{2}{3}\text{Tetrahedral voids- B}$
4. $\text{hcp lattice - B,}\frac{2}{3}\text{Tetrahedral voids- A}$

Q.

Amorphous solids are

1. Solid substance in real sense

2. Liquid in real sense

3. Supercooled liquid

4. Substance with definite melting point

Q. Choose the correct option(s)
Crystalline solids do not have/show:

Q. Which of the following is true regarding absorption and adsorption?

1. In adsorption, the substance is concentrated only at the surface and does not penetrate through the surface.
2. In absorption, the substance is concentrated only at the surface and does not penetrate through the surface.
3. (a) and (c) above.
4. In absorption, the substance is uniformly distributed throughout the bulk of the solid.

Q. Match the following:
$\begin{array}{cc}ColumnI& ColumnII\\ 1.Diamond& i.Crystalline\\ 2.Coke& ii.Amorphous\\ 3.Rubber& \\ 4.Plastic& \end{array}$

1. 1-(i), 2-(i), 3-(ii), 4-(ii)

2. 1-(ii), 2-(i), 3-(i), 4-(i)

3. 1-(i), 2-(ii), 3-(ii), 4-(ii)

4. None of these