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Solid State · Question 42

AIPMT 2004MCQEasy📈 Topic in 0% papers+4−1
1

A compound formed by elements X and Y crystallizes in a cubic structure in which the X atoms are at the corners of a cube and the Y atoms are at the face-centers. The formula of the compound is :-

  1. XY3
  2. X3Y
  3. XY
  4. XY2

Answer

(1) XY3

Solution

Atoms of X at 8 corners: 8 18 = 1

Atoms of Y at 6 face-centres: 6 12 = 3

⇒ X : Y = 1 : 3

∴ The formula of the compound is XY3.

Answer: (1)

Out of syllabusAIPMT 2004

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2

The pyknometric density of sodium chloride crystal is 2.165 103 kg m-3 while its X-ray density is 2.178 103 kg m-3. The fraction of unoccupied sites in sodium chloride crystal is

  1. 5.96
  2. 5.96 10-2
  3. 5.96 10-1
  4. 5.96 10-3
Out of syllabusAIPMT 2003
3

Number of atoms per unit cell in B.C.C. is

  1. 9
  2. 4
  3. 2
  4. 1
AIPMT 2002
4

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
Out of syllabusAIPMT 2001
5

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
6

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
7

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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