Answer :
The following statements correctly describe a polar covalent bond are :
a. The lattice energy of an ionic compound tends to decrease as ionic size increases.
b. NaCl is expected to have a higher lattice energy than NaBr.
The lattice energy is the amount of the energy required to convert one mole of an ionic solid to gaseous. The lattice energy increases as the ion charge increase and the ionic size decreases and the lattice energy decreases as the ionic size increases.
lattice energy ∝ charge on ion / ion size
The NaCl is expected to have a higher lattice energy than NaBr. as we move down the group ionic size increases and lattice energy decreases.
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