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191.

AgBr can show both Schottky and Frenkel defect. State True or False

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192. In the crystal structures of sodium chloride, the arrangement of CI^– ions is bcc.

False

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193. In hcp and ccp structures, only 68% of the total space is filled by atoms.

False

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194. Dimagnetic substances are strongly attracted by magnetic field.

False

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195. The size of an octahedral hole is less than that of tetrahedral hole.

False

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196. When electrons are trapped in the crystal in the anionic vacancy, the defect is known as F-centres.

True

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197. On doping Ge metal with a little of In (Indium) we get p-type semi-conductor.

True

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198. In the CaF₂ structure, the coordination number of cations and anions are respectively 4 and 8.

True

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199. The number of atoms in a face-centred cubic unit cell is:

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200. Schottky defect generally appears in

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