Answer is (3)
- Sodium Nitrate.
Normally ionic bonds can be seen between
metals and non-metals while covalent
bonds present between
non-metals. Another thing that determines the bond nature is electronegativity
value of the atoms.
If the electronegativity difference
is high, then that bond tends to be an ionic bond.
Sodium nitrate consists of Na⁺ and NO₃⁻ ions. Hence, the bond
between Na⁺ and NO₃⁻ is an ionic
bond.
NO₃⁻ is made from N and O. Both are non-metallic
atoms. The electronegativities of N and O are 3.0 and 3.5 respectively. Hence, there is no
big difference between
electronegativity values (3.5 - 3.0 = 0.5). Hence, the bond
between N and O is a covalent
bond.
