KCl is an electrovalent compound, while HCl is a covalent compound. But, both conducts electricity in their aqueous solution. Explain.

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Solution

KCl is an electrovalent compound consisting of K⁺ and Cl^- ions bonded to form a crystal lattice. In water, KCl dissociates into K⁺ and Cl^- ions which are free to move. Due to this, its aqueous solution conducts electricity.

HCl is a covalent compound but in water it forms HCl acid consisting of H⁺ and Cl^- ions which conducts electricity.

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Magnesium chloride is an ionic compound while hydrogen chloride is a covalent compound. But both form ions in their aqueous solutions. Explain

Explain the following :

(a) Electrovalent compounds conduct electricity in molten or aqueous state.

(b) Electrovalent compounds have a high melting point and boiling point while covalent compounds have low melting and boiling points.

H C l

H C l

H^{+}

C l^{-}

Explain the following :

(a) Electrovalent compounds conduct electricity in molten or aqueous state.

(b) Electrovalent compounds have a high melting point and boiling point while covalent compounds have low melting and boiling points.

(d) Atoms combine by transfer and sharing of electrons (s).

(e) An element has atoms with different mass number.

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