KEAM 2019 Physics and Chemistry Paper

Question : 105 of 120

Marks: +1, -0

The edge length of a solid possessing cubic unit cell is 2√2r (structure I), based on hard sphere model, which upon subjecting to a phase transition, a new cubic structure (structure II) having an edge length of 4√3r is obtained, where r is the radiusof the hard sphere. Which of the following statements is true?

Density of the structure II is lower than structure I
Density of structure II is higher than structure I
The pore volume in structure I is 1.2 times higher than that of structure II
The pore volume of both the structures are equal
The octahedral voids in structure I is transformed into tetrahedral voids in structure II

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