The properties of several unknown solids were measured. Classify these solids

melting-point

#1

The properties of several unknown solids were measured. Classify these solids.

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Concepts and reason
In the given list of solids, identify the solids which do not conduct electricity and then classify them based on their stability.
Then, identify the solids which conduct electricity in liquid state only and the solid which conducts electricity in all the states.

Fundamentals
A chemical bond is an attraction between atoms that results in the formation of a chemical compound. The bond may be formed by the transfer of electron from on atom to another or by sharing of electrons between the atoms. This bond formation results in the decrease in the overall potential energy of the resulting bond.
Ionic bond: This type of bond is formed when the transfer of electron takes place from one atom to another. This type of bond is generally formed between a metal and a non-metal. The less electronegative loses the electron and the more electronegative gains the electron.
Covalent bond: This type of bond is formed by the sharing of electrons between the atoms. This type of bond is formed between two same non-metals. There is no electronegativity between the bonding atoms.
Metallic bond: this type of bond is present in the metals present in the periodic table.
Molecular solids: These solids are formed by the collection of solids which are held by intermolecular forces.

Answer:

The solids that do not conduct electricity are as follows:

Covalent solid with melting point image.
Molecular solid with melting point image.

Explanation:
Covalent and molecular solids do not contain free ions for the free movement. Due to the unavailability of the free ions, these solids do not conduct electricity.
Covalent solids are extremely stable, due to which these solids have very high melting point.
Molecular solids are not very stable. So, their melting point is not very high.

The solid that conducts electricity in the liquid state, but not in solid state is ionic solid.
The solid that conducts electricity in the solid state is metallic solid.
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Explanation:
The ionic solids conduct electricity in the liquid state but not in solid state because in liquid state, the ionic solid contains free ions. These free ions conduct electricity in the liquid state.
The metallic solids conduct electricity in all the states due to the presence of free ions.