States of Matter

1

How many unit cells are present in a cube-shaped ideal crystal of NaCl of mass 1.00 g? [Atomic masses: Na = 23, Cl = 35.5]

  1. 2.57 × 1021
  2. 1.28 × 1021
  3. 1.71 × 1021
  4. 5.14 × 1021
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2

In a compound, atoms of element Y form ccp lattice and those of element X occupy 2/3rd of tetrahedral voids. The formula of the compound will be

  1. X2Y
  2. X3Y4
  3. X4Y3
  4. X2Y3
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3

Lithium forms body centred cubic structure. The length of the side of its unit cell is 351 pm. Atomic radius of the lithium will be

  1. 75 pm
  2. 152 pm
  3. 240 pm
  4. 300 pm
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4

For an ideal gas, number of moles per litre in terms of its pressure P, gas constant R and temperature T is

  1. P/RT
  2. PT/R
  3. RT/P
  4. PRT
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