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JEE Main levelSingle correct optionDifficulty 2 of 3ss027

The correct increasing order of packing efficiency is

  1. Adiamond cubic < simple cubic < bcc < ccp
  2. Bsimple cubic < bcc < diamond cubic < ccp
  3. Csimple cubic < diamond cubic < bcc < ccp
  4. Ddiamond cubic < bcc < simple cubic < ccp

Answer: A

The packing efficiencies are about 34% for diamond cubic, 52.4% for simple cubic, 68% for bcc and 74% for ccp. The open diamond structure (CN 4) is the loosest.
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