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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 so called because they do not alter the stochiometry of the crystal in both Schottky and Frenkel defects. They are called intrinsic defects because it is due to the deviation from regular arrangement of constituent particles with in the crystal and no external substance is added.
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Stoichiometric defect is also known as

What type of stoichiometric defects are noticed in crystals?

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. Which of the following defect, if present, lowers the density of the crystal ?

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. In a crystal some ions are missing from normal sites. This is an example of

Schottky defect is-

Which stoichiometric defect in crystals increses the density a solid?

Give reasons : (i) In stoichiometric dfects. NaCl exhibits Schottky defect and not Frenkel defect. (iii) Ferrimagnetic substances show better magnetism than antiferromagnetic substances.

In an ideal crystal, the entropy of the constituents at absolute zero temperature (0K) is zero. However, the crystals generally suffer from certain defects also called imperfections They may be both electronic and atomic in nature. The atomic imperfections may be stoichiometric (Schottky and Frenkel defects) or non-stoichiometric (metal excees and metal deficiency defects). In addition to these, there are impurity defects which are caused by the addition of certain impurities of metals and this is known as dopping. The dopping leads to semi conductors which may be either n-type or p-type in nature. Which of the following is correct ?

In an ideal crystal, the entropy of the constituents at absolute zero temperature (0K) is zero. However, the crystals generally suffer from certain defects also called imperfections They may be both electronic and atomic in nature. The atomic imperfections may be stoichiometric (Schottky and Frenkel defects) or non-stoichiometric (metal excees and metal deficiency defects). In addition to these, there are impurity defects which are caused by the addition of certain impurities of metals and this is known as dopping. The dopping leads to semi conductors which may be either n-type or p-type in nature. Zinc oxide (ZnO) is white when cold and yellow when hot. It is due to the development of :

CENGAGE CHEMISTRY ENGLISH-NCERT BASED EXERCISE-Short Answer Type Questions
  1. Why NiO and FeO are nonstroichiometric with the formula Ni(0.98)O and ...

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  2. Why the defectsof the crystalline solids are called thermodynamic defe...

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  3. Why stoichiometric defects are also called intrinsic defects?

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

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  5. why is Frenkel defects not found in pure alkali metal halides ?

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  6. why does table salt ,NaCl sometimes appear yellow in colour?

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  7. How do the electrical conductivity and resistivity of metallic conduct...

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  8. What is energy gap in bond theory?

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  9. What is photo voltaic cell?

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  10. What happens when ferrimagnetic Fe(3)O(4) is heated to 850 K?

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  11. What happens when ferromagnetic substance is heated to high temperatur...

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  12. Which type of defect is product when NaCl is dopped with AlCl(3)?

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  13. Which point defect lowers the density of a crystal?

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  14. At what temperature range most of the metals becomes superconductors

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  15. What is curie temperature?

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

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

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

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  19. What are the types of lattice imperfection found in crystals?

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  20. What is dislocation in the crystals

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