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Solid State · Question 45

AIPMT 2001MCQEasy📈 Topic in 12% papers+4−1
1

When Zn converts from melted state to its solid state, it has hcp structure, then find the number of nearest atoms.

  1. 6
  2. 8
  3. 12
  4. 4

Answer

(3) 12

Solution

As per NCERT, in hexagonal close packing (hcp) each sphere is in contact with 6 spheres in its own layer, 3 spheres in the layer above and 3 spheres in the layer below.

⇒ Number of nearest neighbours (coordination number) = 6 + 3 + 3 = 12

∴ Each Zn atom in the hcp structure has 12 nearest atoms.

Answer: (3)

Out of syllabusAIPMT 2001

Keep practising — Solid State

2

The cations and anions are arranged in alternate form in

  1. metallic crystal
  2. ionic crystal
  3. covalent crystal
  4. semi-conductor crystal
AIPMT 2000
3

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
4

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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