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(a) What are intrinsic semi-conductors? Give an example. (b) What is the distance between Na + and Cl ions in NaCl crystal if its

(a) What are intrinsic semi-conductors? Give an example.
(b) What is the distance between Na⁺ and Cl^– ions in NaCl crystal if its density is 2.165 g cm^-3? [Atomic Mass of Na = 23u, Cl = 35.5u; Avogadro’s number = 6.023 × 10²³]

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