Lattice Enthalpy in Ionic Compounds

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Questions and Answers

What is lattice enthalpy?

The energy required to convert one mole of a solid ionic compound into liquid form
The energy required to form one mole of a solid ionic compound from its constituent ions
The energy released when one mole of a solid ionic compound is formed
The energy required to completely separate one mole of a solid ionic compound into gaseous constituent ions (correct)

Why is it not possible to calculate lattice enthalpy directly from the interaction of forces of attraction and repulsion only?

Because the lattice enthalpy is purely based on electrostatic forces
Because the lattice enthalpy is not affected by the crystal structure
Because the lattice enthalpy is influenced by the crystal geometry (correct)
Because the lattice enthalpy only depends on the type of ions present

How is bond length defined in a molecule?

As the distance between the outermost electrons of two bonded atoms
As the distance between the core and valence electrons of two bonded atoms
As the distance between the protons of two bonded atoms
As the distance between the nuclei of two bonded atoms (correct)

What is the covalent radius of an atom in a covalent bond?

The radius of an atom's core which is in contact with the core of an adjacent atom in a bonded situation (A) Signup and view all the answers

How are bond lengths typically measured?

By spectroscopic, X-ray diffraction, and electron-diffraction techniques (D) Signup and view all the answers

What does the van der Waals radius represent for an atom?

The overall size of the atom including its valence shell (D) Signup and view all the answers

Why does He2 molecule not exist?

Its bond order is zero, indicating instability (D) Signup and view all the answers

How is the electronic configuration of Li2 molecule different from Li atom?

Li2 has more electrons than Li (C) Signup and view all the answers

Why is C2 molecule diamagnetic?

It contains no electrons in antibonding molecular orbitals (C) Signup and view all the answers

How many electrons are present in O2 molecule based on the given text?

16 electrons (C) Signup and view all the answers

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