Which is the incorrect statement?

  • Option 1)

    FeO0.98 has non stoichiometric metal deficiency defect.

  • Option 2)

    Density decreases in case of crystals with Schottky's defect.

  • Option 3)

    NaCl(s) is insulator, silicon is semiconductor, silver is conductor, quartz is piezo electric crystal.

  • Option 4)

    Frenkel defect is favoured in those ionic compounds in which sizes of cation and anions are almost equal.

 

Answers (1)

As we learnt in

Crystalline solid -

Solid in which constituent particles are arranged in a definite regular order upto infinite array in three dimension. It is anisotropic and have sharp melting point.

- wherein

Ex. NaCl, diamond

 

Frenkel defect is shown by ionic substances in which there is a large difference in the size of ions. Here, the smaller ion occupies an interestitial site creating a vacancy.


Option 1)

FeO0.98 has non stoichiometric metal deficiency defect.

Incorrect option

Option 2)

Density decreases in case of crystals with Schottky's defect.

Incorrect option

Option 3)

NaCl(s) is insulator, silicon is semiconductor, silver is conductor, quartz is piezo electric crystal.

Incorrect option

Option 4)

Frenkel defect is favoured in those ionic compounds in which sizes of cation and anions are almost equal.

correct option

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