Chemistry 107 five following pictures show the December 15.2016 Final empty orbi

Question

Chemistry 107 five following pictures show the December 15.2016 Final empty orbitals. Which is of the bands page 15 of 19 the correct of Mo levels of ption of energy these five? gray shad Cl) (5) GaAs Ge doped Si doped diamond with As with Ga (a) (2) (c) Q) (5) (4) (5) (5) (4) (d) (3) (5) (4) (e) (1) (4) (5) 32. As temperature increases from 0 K (a) the electrical conductivity of a ceramic superconductor remains high until Teand then decreases sharply, the conductivity of a semiconductor decreases, and the conductivity of a metal (above Tc) decreases. (b) the electrical conductivity of a ceramic superconductor remains low until Te and then increases sharply, the conductivity o a semiconductor increases, and the conductivity of a metal (above Tc) decreases. (c) the electrical conductivity of a ceramic superconductor remains high until To and then a decreases sharply, the conductivity of a semiconductor increases, and the conductivity of metal (above Te) increases. (d) the electrical conductivity ofa ceramic superconductor remains high until Teand then a decreases sharply, the conductivity of a semiconductor increases, and the conductivity of metal (above Te) decreases. (e) the electrical conductivity ofa ceramic superconductor remains high until T. and then increases sharply, the conductivity of a semiconductor increases, and the conductivity of metal (above Tc) decreases.

Explanation / Answer

For Q 31:
Answer is Option D
Na (Sodium) is a highly unstable metal form which can easily donate electrons. Thus, its orbitals (filled and empty) have to be very close for easy electron transfer. Thus , option 2
GaAs, have both p(positive) and n(negative) type elements in it. Thus , option 3.
Ge doped with As. It has more n type Thus, option 1.
Si doped with Ga. It has more p type . Thus , option 5.
Diamond will have a very high energy requirment for electron transfer. Thus, the orbitals are as far as possible. Thus, option 4.

For Q 32:
Option C
Superconductor has its high electrical coductivity starting when the temerature is lowered below the critical temp called Tc.
Thus it has high electrical conductivity before Tc, but after (above) Tc, it falls sharply.
As for both semiconductors and metal conductors, conductivity increases with temperature.

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