Question

Which of the following compounds are covalent?(a) H₂ (b) CaO (c) KCl (d) Na₂S

Answer 1

sol.H2 is a covalent, diatomic, molecule with a sigma covalent bond between two hydrogen atoms.
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Answer 2

$H_2$ is a covalent compound.

Explanation:

A covalent compound is formed when an element shares its valence electron with another element. This compound is formed between two non metals.  Example: $H_2$

An ionic compound is formed when an element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element and the element which accepts the electrons is known as electronegative element. This compound is formed between a metal and an non-metal. Example: $CaO$ , $KCl$ and $Na_2S$

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