See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

Effective number of carbon atoms present at corners = 8 8 1  = 1 Effective number of carbon atoms present at face centers = 6 2 1  = 3 Effective number of carbon atoms present in tetrahedral holes = 8 × 2 1 = 4.  Total number of effective carbon atoms present in a unit cell of diamond is 8.