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What is Schottky defect ?...

What is Schottky defect ?

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Missing of equal number of cations and anions from the crystal lattice is called Schottky defect.
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The number of Schottky defects (n) present in an ionic compound containing N ions at temperature T is given by n = Ne^(-E//2KT) , where E is the energy required to create n Schottky defects and K is the Boltzmann constant, If the mole fraction of Schottky defect in NaCl crystal at 2900 K is X , then calculate -ln(x) , Given: DeltaH of Schottky defect = 2 eV and K = 1.38 xx 10^(-23) J K^(-1) 1 eV = 1.608 xx 10^(-19) J

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SUNSTAR PUBLICATION-SUPPLEMENTARY EXAM QUESTION PAPER JULY - 2018-PART - D
  1. Write the IUPAC name of K(2)[Zn(OH)(4)].

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  2. a) Calculate the packing efficiency of particles in a body centred cub...

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  3. What is Schottky defect ?

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  4. 5.8 g of non - volatile, non - electrolyte solute was dissolved in 100...

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  5. Mention any two differences between ideal and non-ideal solutions.

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  6. Calculate the e.m.f. of the cell in which the following reaction takes...

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  7. State the Faraday's first law of electrolysis. How many Faraday of ele...

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  8. Derive an integrated rate equation for the rate constant of a zero ord...

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  9. Draw a graph of potential energy V/S reaction co - ordinates showing t...

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  10. Write any two characteristics of chemical adsorption.

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  11. What is Brownain movement ? What is the cause for it ?

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  12. What is homogenous catalysis? Give an example.

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  13. Write equations for the steps in S(N)1 mechanism of conversion of tert...

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  14. Explain Wurtz-Fitting reaction with equation.

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  15. CH(3)Cl + NaI overset("Dry acetone")rarr CH(3)I + NaCl. Name the above...

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  16. Write the mechanism of acid catalysed dehydration of ethanol to ethene...

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  17. How does anisole react with bromine in ethanoic acid ? Give equation.

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  18. Complete the following equations : (i) (iii) CH(3)COONa overset(N...

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  19. Explain esterification reaction with an example.

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  20. How is methylamine prepared by Hoffmann bromamide degradation reaction...

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