Question

give reasons:
i. Hydrogen chloride can be termed as a polar covalent compound.
ii. Covalent compounds exist as gases liquids or soft solids
iii. Electrovalent compounds have high boiling point
iv. There is no change in atomic number when an atom forms ion
v. Aqueous solutions of electrovalent compounds conduct electricity.

Answer 1

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Answer 2

Explanation:

1) chlorine being more electro negative attracts the shared pair of electrons towards itself as a result hydrogen acquires partial positive charge and chlorine gets partial negative charge. Thus, hydrogen chloride can be termed as a polar covalent compound.

2)Covalent compounds have strong covalent bonds between the atoms in a molecule, but the intermolecular forces (Vander Waal's forces) are weak. Hence, covalent compounds are gaseous if molecules are less and liquid or soft solids if molecules are more.

3).The more energy needed, the higher the melting point or boiling point . Since the electrostatic forces of attraction between oppositely charged ions are strong, their melting and boiling points are high.

4)When an atom forms an ion by loss or gain of electrons, the number of electrons revolving around the nucleus changes. But the total number of protons remains the same. Hence, the atomic number of the element does not changes when it forms ion

5)Electrovalent compounds in the solid state do not conduct electricity because movement of ions in the solid state is not possible due to their rigid structure. But these compounds conduct electricity in the molten state. ... Thus, the ions move freely and conduct electricity.