. Consider four statements. I. Inside crystal, because of differenc...

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. Consider four statements.
I. Inside crystal, because of difference of position, each electron has different energy; this makes energy bands in crystals.
II. Energy levels of valence electrons are included in valence band.
III. Energy level above the valence band is conduction band.
IV. In metals, conduction band and valence band overlap.
Correct statements are
(a) I and II
(b) I, II and IV
(c) II and III
(d) I, II, III and IV
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