Q51 / 180 · AIIMS 2019 (25 May) · Chemistry

The number of tetrahedral voids present in 0.5 mole of $h c p$ crystal structure are

  • A
    $3.6 \times 10^{23}$
  • B
    $9 \times 10^{23}$
  • Correct answer
    C
    $3.6 \times 10^{24}$
  • D
    $6.02 \times 10^{23}$

Solution

For hcp, $Z=6$ $\therefore$ Tetrahedral voids $=2 Z=2 \times 6=12$ Tetrahedral voids present in $0.5 \mathrm{~mol}=12 \times 0.5 \mathrm{~mol}$ $=6 N_A=6 \times 6.02 \times 10^{23}=3.6 \times 10^{24}$

Hence, the correct answer is option: 'C'.

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