Question

After some 20 years, you have become a scientist. You found two new solids X and Y. Some of the properties of these solids are:

With the given information, which of the following is true??

• A. X is most likely to be crystalline
• B. Y is most likely to be amorphous
• C. X is most likely to be amorphous
• D. Y is most likely to be crystalline

Answer 1

Answer: (A), (B)

The correct options are
A

X is most likely to be crystalline

B

Y is most likely to be amorphous

Let’s take a look at the properties of X and Y and try to match it with crystalline and amorphous solid.

$$\begin{array}{cc}Crystalline& Amorphous\\ \to \text{Has regular and repeating arrangement of particles (X has similar property})& \to \text{Irregular arrangement of particles (Y also have similar property)}\\ \to \text{Fixed melting point. (X has similar property)}& \to \text{Range of melting point (Y has similar property)}\\ \text{Anisotropic}& \to Isotropic\end{array}$$

Therefore, X is most likely to be a crystalline solid.

Y is most likely to be an amorphous solid.