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Saturday, May 23, 2020
A metal crystallizes into two cubic phases, face centered cubic (fcc) and body centered cubic (bcc), whose unit cell lengths are 3.5 A° and 3.0 A°, rcspcctively. Calculate the ratio of densities of fcc and bcc. (IIT-JEE 1999)
A metallic element crystallizes into a lattice containing a sequence of layers ABABAB....Any packing of spheres leaves out voids in the lattice. What percentage by volume of this lattice is empty space? ( IIT-.IEF 2006)
The sequence ABABAB... indicates hcp unit cell. Now, there are 6 atoms per unit cell and volume of the umt cell is 24√2 r3.Thus, the packing fraction is:
The coordination number of Al in the crystalline state of AlCl3 is .... (IIT-JEE 2009)
AlCl3 exist in CCP unit cell with 6 co-ordinate layer structure and coordination number of Al is (6)
The number of hexagonal faces that are present in truncated octahedron is .... (IIT-JEE 2011)
The number of hexagonal faces that are present in truncated octahedron is (6) this can seen if given fig.
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