Verified Solution • 2025–26 Session moderate

QAIPMT-2003-Ch-2673: NEET 2003 Chemistry - Class 12 AIPMT-2003-Ch-2673 Solution: The pyknometric density of sodium chloride crystal is \(2.165…

The pyknometric density of sodium chloride crystal is 2.165×103 kg m−32.165\times10^3\ \text{kg m}^{-3} while its X-ray density is 2.178×103 kg m−32.178\times10^3\ \text{kg m}^{-3}. The fraction of unoccupied sites in sodium chloride crystal is

Multiple Choice Options

  • A 5.96
  • B 5.96×10−25.96\times10^{-2}
  • C 5.96×10−15.96\times10^{-1}
  • D 5.96×10−35.96\times10^{-3}

Step-by-Step Verified Solution

Molar volume from pyknometric density = M 2.165 _ 10 3 m 3 Molar volume from X-ray density = M 2.178 _ 10 3 m 3 Volume unoccupied = M 10 3 ( 1 2.165 _ 1 2.178 ) m 3 Fraction unoccupied = ( 0.013 M _ 10 _ 3 2.165 _ 2.178 ) ( M _ 10 _ 3 2.165 ) = 5.96 _ 10 -3

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