Answer
a) form covalent bond.
b) form ionic bond.
c) form covalent bond.
d) form ionic bond.
Work Step by Step
Metals have the tendency to emit electron and form cation. On the other hand, non metals have the tendency to accept that electron and form anion. That's how ionic bond is formed and the compound becomes ionic compound. If both the elements are non metal they can share electrons to form covalent bond rather than emit or accept the complete electron. That's how covalent compound is formed.
a) carbon and hydrogen both are non metal. So, they will form covalent bond.
b) sodium is metal and sulfur is non metal. So, they will form ionic bond.
c) hydrogen and oxygen both are non metal. So, they will form covalent bond.
d) magnesium is metal and bromine is non metal. So, they will form ionic bond.
