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Solid State · Question 46

AIPMT 2000MCQEasy📈 Topic in 0% papers+4−1
1

The cations and anions are arranged in alternate form in

  1. metallic crystal
  2. ionic crystal
  3. covalent crystal
  4. semi-conductor crystal

Answer

(2) ionic crystal

Solution

In an ionic crystal (e.g. NaCl), the constituent particles are positive and negative ions.

⇒ Each cation is surrounded by anions and each anion by cations, so the ions alternate in the lattice and are held by electrostatic attraction.

∴ Metallic crystals contain positive kernels in a sea of electrons, and covalent / semiconductor crystals contain atoms joined by covalent bonds.

Answer: (2)

AIPMT 2000

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2

Cations and anions combine in a crystal to form the following type of compound

  1. ionic
  2. metallic
  3. covalent
  4. dipole-dipole
Out of syllabusAIPMT 2000
3

In a cubic crystal, A-atoms are placed at every corner and B-atoms at the centre of every face. The formula of the compound is

  1. AB
  2. AB3
  3. A2B2
  4. A2B3
Out of syllabusAIPMT 2000

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