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Q.

Consider the following statements.
I. Impurity defects arise when foreign atoms are present at the lattice site in place of host atoms or at the vacant interstitial sites.
Il. Addition of impurities alters the properties of the crystal.
III. Doping is the process of adding impurities to a crystalline substance so as to change its properties.
  Which of the above statement(s) is/are correct?

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a

I and II

b

I and III

c

II and III

d

I, Il and III

answer is D.

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Detailed Solution

All the given statements are true.

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Consider the following statements.I. Impurity defects arise when foreign atoms are present at the lattice site in place of host atoms or at the vacant interstitial sites.Il. Addition of impurities alters the properties of the crystal.III. Doping is the process of adding impurities to a crystalline substance so as to change its properties.  Which of the above statement(s) is/are correct?