The lattice site in a pure crystal cannot be occupied by ..................

(a) molecule (b) ion (c) electron (d) atom

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Solution

Answer: (c) electron

Each point in a lattice is known as lattice point which is either atom or molecule or ion which are joined together by a straight line to bring out the geometry of lattice in pure crystal constituents are arranged in fixed stoichiometric ratio.

Hence, the existence of free electrons is not possible it is possible on in case of imperfection in solid.

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Schottky defect is observed in crystals when .....................

(a) some cations move from their lattice site to interstitial sites

(b) equal number of cation and anions are missing from the lattice

(d) some impurity is present in the lattice

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