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4. Chemical bonding and molecular structure — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry4. Chemical bonding and molecular structure1 Mark
MCQ
An ionic compound $A^+ B^-$ is most likely to be formed when
  • A
    the ionization energy of $A$ high and electron affinity of $B$ is low
  • ✓
    the ionization energy of $A$ is low and electron affinity of $B$ is high
  • C
    both, the ionization energy of $A$ and electron affinity of $B$ are high
  • D
    both, the ionization energy of $A$ and electron affinity of $B$ are low
✓

Answer

Correct option: B.
the ionization energy of $A$ is low and electron affinity of $B$ is high
b
The ionization energy $(IE)$ is defined as the amount of energy required to remove the most loosely bound electron of an isolated gaseous atom to form a cation. Electron affinity of an atom or molecule is defined as the amount of energy released when an electron is added to a neutral atom or molecule in the gaseous state to form a negative ion. When the ionization energy is low and electron affinity is high, more will be the tendency to form an ionic bond.

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