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1. A material is made from Al, Ga, and As. The mole fraction of each element is 0.25, 0.26,and 0.49, respectively. This material would be
[A] ann-type semiconductor.
[B] a metallic conductor because Al is present.
[C] an insulator.
[D] ap-type semiconductor.
[E] None of these
2. Which of the compounds below is an example of a network solid?
3. Which of the statements a through d is incorrect?
[A] The binding forces in a molecular solid include London dispersion forces.
[B] Ionic solids have high melting points.
[C] Molecular solids have high melting points.
[D] Ionic solids are insulators.
[E] All of the statements a through d are correct.
4. At room temperature, CsF is expected to be
[A] A gas.
[B] A conducting solid.
[D] A liquid.[E] A soft solid.
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