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Why stoichiometric defects are also call...

Why stoichiometric defects are also called intrinsic defects?

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Stoichiometric defects are those defects in which the ratio of cations to anions remains the same as represented by the molecular formula
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Non-Stoichiometric defect

Stoichiometric defect is also known as

What type of stoichiometric defects are noticed in crystals?

Which stoichiometric defect does not change the density of the crystal?

Give reasons : In stoichiometric defects, NaCl exhibits Schottky defect and not Frenkel defect.

Assertion (A) Both Frenkel and Schottky defects are stoichiometric defects. Reason (R ) Both defects change the density of the crystalline solid.

Any deviation from the perfectly ordered arrangement constitutes a defect or imperfection. The compounds in which the number of irregularity are present in the arrangement of atoms or ions are called atomic imperfections or point defects. These may be stochiometric or non - stoichlometric. Stoichiometric defects are further classified into Schottky defects in which number of positive and negative ions are missing in equal ratio and Frenkel defects in which an ion leaves its correct lattice sites and occupies on interstitial site. Schottky defect is more common in ionic compounds with high co-ordination number and where the size of positive and negative ions are almost equal, while in Frenkel defects are common in ionic compounds, which have low co-ordination number and in which there is large difference in size between positive and negative ions. KBr shows, which of the following stoichiometric defects ?

PRADEEP-STATES OF MATTER: SOLID MATTER-ADDITIONAL QUESTIONS (VERY SHORT ANSWER )
  1. Silver crystallises with face - centred cubic unit cells .each side of...

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  2. Write expression for molar mass, M (in kg mol^(-1)) of a body-centred ...

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  3. Why stoichiometric defects are also called intrinsic defects?

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  4. What are interstitials in a crystal ?

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  5. Schottky defect.

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  6. Explain the term 'Dislocations ' in relation to crystals

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  7. Give the name of one solid which shows both Schottky and Frenkel defec...

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  8. What are non-stoichiometric compounds ?

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  9. In Frenkel defect

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  10. What other elements may be added to silicon to make electrons availabl...

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  11. Why does Frenkel defect not change the density of AgCl crystals ?

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  12. Mention one property which is caused due to the presence of F-centre i...

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  13. Name the compound that can be added to AgCl so as to produce cation va...

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  14. What are point defects ? Describe Schottky defects in crystals.

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  15. When NaCl crystal is doped with MgCl(2),the nature of defect produced ...

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  16. Why is potassium chloride sometimes violet instead of pure white ?

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  17. What is the difference between 13-15 and 12-16 compounds ?

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  18. f-centre is

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  19. Name the non-stoichiometric point defect responsible for the colour of...

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  20. Name the type of defect that occurs in the crystals of zinc sulphide.

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