Question

Odd one out of hydrogen sodium potassium carbon

Answer 1

Carbon is odd one as it forms covalent compounds whereas others form ionic compounds.

Answer 2

The odd one between hydrogen, sodium, potassium, and carbon is carbon.

This is because carbon forms the covalent compounds whereas all other three forms ionic compounds.  

Carbon is a non-metal and forms a compound with combination of another non-metal after sharing the valence.o

In ionic compounds, the uniqueness of the atoms is maintained.