21.What type of stoichiometric defect is shown by (i) ZnS, (ii) AgBr (iii) KCl
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22.Explain how vacancies are introduced in an ionic solid when a cation of higher valence is added as an impurity in it.
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23.Ionic solids, which have anionic vacancies due to metal excess defect, develop colour. Explain with the help of a suitale example.
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24.A group 14 element is to be converted into N-type semi-conductor by doping it with a suitable impurity. To which group should this impurity belong?
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25.What type of substances would make better permanent magnets, ferromagnetic or ferrimagnetic, justify your answer.
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26.how many the number of tetrahedral and octahedral voids are present in a cubic close packed structure of A spheres?
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27. What would be the number of tetrahedral and octahedral voids,In a face centred cubic unit cell (i.e., ccp structure) 4 atoms/ions are present?
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28.What type of point defect in a crystal of zinc sulphate?
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29.A cubic solid is made of two elements Y and Z. Atoms of Z are at the corners of the cube and Y at the body centre. What is the formula of the compound?
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30.MgO has rock salt type structure. What is the co-ordination number of each ion?
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