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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
Solid $NaCl$ is a bad conductor of electricity since
  • A
    In solid $NaCl$ there are no ions
  • B
    Solid $NaCl$ is covalent
  • ✓
    In solid $NaCl$ there is no motion of ions
  • D
    In solid $NaCl$ there are no electrons
✓

Answer

Correct option: C.
In solid $NaCl$ there is no motion of ions
c
A substance can only conduct electricity if it contains charged particles (electrons or ions) that are free to move around. In solid sodium chloride, there are ions but these ions are locked into the ionic lattice and are unable to move.

$NaCl$ (common salt) is solid in state and solid ions or compounds don't conduct electricity. It needs to be either melted, molten or dissolved in a solution (i.e. water) first. Only then will the electrons be free to move to either the Cathode $(-ve)$ or to the Anode $(+ve)$. In a liquid state the electrons are free enough to move.

Hence, solid $NaCl$ is a bad conductor of electricity because its ions cannot move freely.

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