Chemical Bonding and Molecular Structure Test - 6

Phosphorus has the electronic configuration 1s² 2s² 2p⁶ 3s² 3p³. It needs three electrons to attain the stable noble gas configuration of argon.

The smaller is the cation, the greater is its polarising power and hence, the larger is its covalent character. Thus, the covalent character decreases down the group as the size of a cation increases.
The correct order of covalent character will be LiCl > NaCl > KCl > RbCl > CsCl.

Both CuSO₄.5H₂O and NH₄Cl have all three types of bonds.
There is an ionic bond between the Cu⁺² and SO₄^-2 ions, where as the formation of SO₄^-2 involves covalent and coordinate bonding.
Moreover, four water molecules form coordinate bonds with the central Cu⁺² ion.
There is an ionic bond between the NH₄⁺ and Cl^- ions, where as the formation of NH₄⁺ involves covalent and coordinate bonding.

Alkali and alkaline earth metal salts are strongly ionic. AgCl is not an alkali or alkaline earth metal salt.
Therefore, it is least ionic.

NaF is ionic as the high electronegativity difference of sodium and fluorine creates a strong ionic bond between them. That's why it has the highest melting point.

Electrovalent or ionic compounds can conduct electricity only in molten state. They do not conduct electricity in solid state because the ions are not free to move.

Bond angle decreases with increase in the number of lone pairs on the central atom.
Thus, the correct order of bond angles is CO₂ > CH₄ > NH₃ > H₂O.

This option is correct because in the case of CH₃F, magnitude of charge is the highest, but in the case of CH₃Cl, the charge is almost the same as that of CH₃F, but the separation between the charges overpowers.
Hence, the magnitude of dipole moment of CH₃Cl is greater than that of CH₃F.
Hence, the correct order is CH₃I < CH₃Br < CH₃F < CH₃Cl.