What is the energy gap between valence band and conduction band in crystal of insulators
a. Both the bands are overlapped with each other
b. Very small
c. Infinite
d. Very large
Ans. d
Explanation : When insulators (non metal atoms) interact to form a solid their atomic orbitals mix to form two bunches of orbitals separated by a large band gap. Electrons cannot therefore be promoted to an empty level, where they could move freely.
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dm-3 sucrose solution at 20 ° C (molar gas constant, R = 8.314 JK -1 mol -1 ; 1 dm-3 = 0.001 m3 ) a. 4870 Pa b. 4.87 Pa c. 0.00487 Pa d. 0.33 Pa Ans. a (17)
