Question

7. Which of the following have sharp melting point in solids : (a) Plastic (b) Rubber (c) Glass (d) Diamond​

Answer 1

Answer:

The solid which have a sharp melting point is diamond as it is crystalline in nature i.e.option(D).

Explanation:

There are two types of solid:-

(i) Crystalline solids:- Solid in which constituent particles are arranged in a definite regular order up to an infinite array in three dimensions. It is anisotropic and has a sharp melting point.

Example-NaCl, Diamond.

(ii)Amorphous solid- Solid in which constituent particles are arranged in a definite irregular order. It is isotropic and has no sharp melting point.

Example-Plastic, glass.

Let's categorize the options into crystalline and amorphous solid,

(a)Plastic-this is an amorphous solid

(b)Rubber-this is an amorphous solid

(c)Glass-this an amorphous solid

(d)Diamond-this is a crystalline solid

Hence, the solid which have a sharp melting point is diamond as it is crystalline in nature i.e.option(D).

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Answer 2

Answer:

Correct option is (d) Diamond

Thus, among the given options, diamond has the sharpest melting point in solids.

Explanation:

There are two types solids:

(i) Crystalline solids - These types of solid have definite shape and geometrical form. They are rigid and incompressible and have sharp and definite melting point.

Examples: Rock, quartz, sodium chloride.

(ii) Amorphous solids - These types of solid do not have definite geometrical shape and they melt over a wide range of temperature.

Examples: Gel, wax, rubber.

Now among the give options:

Amorphous solids : Plastic, Rubber, Glass

Crystalline solids : Diamond

Hence, among the given options, diamond has the sharpest melting point in solids as it is a crystalline solid.