Question

covalent bond is absent in......
a)H2O
b)HCL
c)Na2O
d)NH3​

Answer 1

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Answer...

Covalent bond is absent c) Na2O

As sodium is a metal , it will only form ionic bond. While rest other central atom are non metals .

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Answer 2

Answer: The correct answer is (C) Na2O.

A covalent bond is absent in Na2O.

Explanation:

It is an ionic compound as its constituent elements,i.e. sodium and oxygen are metal and non-metal respectively.

The rest of the compounds such as H2O, HCl and NH3 are covalent in nature as the bond is formed between two non-metals in each of them.

A covalent bond is formed when there's sharing of electrons between two elements whereas ionic bonds are formed by transfer of valence electrons between two elements.