Lattice Energy

Q.

Which of the following substance has the highest melting point?

1. BaO

2. MgO

3. KCl

4. NaCl

Q.

Which compound will show the highest lattice energy?

1. RbF

2. CsF

3. KF

4. NaF

Q.

Define lattice energy?

Q. The magnitude of the lattice energy of a solid increases if

1. The charges on both the ions are small
2. The size of the ions are small
3. The size of the ions are large
4. The ions are of equal size

Q. Which of the following is not true for $NaCl$ and $MgO$?

1. $NaCl$ has higher lattice energy than $MgO$.
2. Magnesium oxide has a higher melting point than sodium chloride.
3. Magnesium oxide is used to prevent and treat low levels of magnesium in the blood.
4. The lattice energy associated with $MgO$ is higher as compared to $NaCl$.

Q. Assertion: Lattice energy of $CaO$ is higher than that of $NaCl$.

Reason: The lattice energy of an ionic compund is directly proportional to the product of the charges of ions.

1. Both the assertion and the reason are true and the reason is the correct explanation of the assertion
2. Both the assertion and the reason are true but the reason is not the correct explanation of the assertion
3. The assertion is true but the reason is false
4. Both the assertion and the reason are false

Q. In a crystal, cations and anions are held together by:

1. Electron
2. Electrostatic force
3. Nuclear force
4. Covalent bond

Q. For two ionic compounds XY and AB, the data of their lattice energy and hydration energy is given as:
$\begin{array}{ccc}\text{Compound}& \text{Lattice energy (kJ/mol)}& \text{Hydration energy(kJ/mol)}\\ XY& 400& 1000\\ AB& 600& 2000\end{array}$
What will be the correct order of solubility in water?

1. AB > XY
2. XY > AB
3. XY = AB
4. Can't be predicted

Q. Ionic compounds having a higher lattice energy than solvation energy are readily soluble

1. True
2. False

Q. Sodium sulphate is soluble in water whereas Barium sulphate is sparingly soluble because:

1. The hydration energy of sodium sulphate is more than its lattice energy
2. The lattice energy of Barium sulphate is more than its hydration energy
3. The lattice energy has no role to play in solubility
4. The hydration energy of sodium sulphate is less than its lattice energy

Q. Which of the following statements is incorrect regarding lattice energy?

1. Greater is the charge on the ions, more is the lattice energy.
2. Lattice energy is inversely proportional to the size of an ion.
3. Lattice energy for $KCl$ is greater than $CaC{l}_2$.
4. Formation of ionic bond depends upon the ionisation energy of cation, electron gain energy of anion and lattice energy.