Question

The lattice energies of the oxides of Mg, Ca, Sr
and Ba follow the order
(1) CaO < Sro < BaO > MgO
(2) CaO > BaO < Sro > MgO
(3) MgO > CaO > Sro > BaO
(4) BaO > Sro > CaO > MgO​

Answer 1

Answer:

longer the Bond length, easy to break

Bond length MgO<CaO<SrO<BaO

lattice enthalpy MgO>CaO>SrO>BaO

Answer 2

Answer:

The lattice energies of the oxides of Mg, Ca, Sr and Ba follow the order MgO>CaO>SrO>BaO.

Explanation:

• The energy required to transform one mole of an ionic solid into gaseous ionic components is known as lattice energy.
• It may also be described as the amount of energy required to split one mole of an ionic crystal into gaseous ions in a vacuum through the use of an endothermic process.
• The strength of ionic bonding in an ionic substance is measured by the lattice energy. It provides information on ionic materials' volatility, solubility, and hardness, along with other things.
• The distance between the ions is inversely proportional to the lattice energy of an ionic molecule.
• The greater the distance between the ions in a lattice, the less the electrostatic forces that keep them together, and hence the lower the lattice energy.
• Since the bond length is in the sequence MgO<CaO<SrO<BaO, the lattice enthalpy is in the order MgO>CaO>SrO>BaO.
• The ionic lattice of smaller atoms has lower interatomic distances and greater binding forces. As a result, the ionic solid's lattice energy increases as the size of the component ions decreases.

#SPJ3