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Close packing, voids and radius ratio

37 questions on Close packing, voids and radius ratio from the Solid State chapter: 8 NEET level, 15 JEE Main, 14 JEE Advanced. Each one opens with its answer and solution.

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Which stacking sequence of close-packed layers corresponds to cubic close packing (ccp)? NEET level
In a close-packed structure of N identical spheres, the number of tetrahedral voids is NEET level
The coordination number of an atom in hexagonal close packing (hcp) is NEET level
A radius ratio r_+/r_- in the range 0.414 to 0.732 corresponds to which coordination number and void? NEET level
Anions of radius 181 pm form a ccp lattice. The radius of the largest sphere that fits into an octahedral void (take r_void/r = 0.414) is, in pm, JEE Main level
A close-packed solid contains 0.25 mol of atoms. Using N_A=6.022x10^23 mol^-1, the number of tetrahedral voids present is JEE Main level
In an ionic solid the cation radius is 95 pm and the anion radius is 181 pm. Using the ranges 0.225-0.414 (CN 4), 0.414-0.732 (CN 6) and 0.732-1.0 (CN 8), the c... JEE Main level
Anions X form a ccp lattice and cations B occupy two-thirds of the octahedral voids. The formula of the compound is JEE Main level
The radius of an anion is 146 pm. Taking r_void/r_anion = 0.225 for a tetrahedral void in close packing, find the radius of the void in pm (nearest integer). JEE Main level
A metal crystallises in ccp (fcc) with edge length 410 pm. Taking sqrt2=1.414, find the radius in pm of the largest sphere that fits in an octahedral void (void... JEE Main level
Which statements about close packing of identical spheres are correct? JEE Main level
Anions X form a ccp lattice. Cations A occupy half of the tetrahedral voids and cations B occupy half of the octahedral voids. The formula is JEE Advanced level
In a rock-salt type crystal MX of edge length 540 pm the anions are in contact along the face diagonal. Taking sqrt2=1.414, the radius of the cation in pm is JEE Advanced level
A ccp lattice of anions contains 0.35 mol of anions. Cations occupy one-fourth of the tetrahedral voids and one-half of the octahedral voids. Using N_A=6.022x10... JEE Advanced level
Anions in a ccp lattice touch along the face diagonal of a cell with edge 565 pm. Take sqrt2=1.414, r_oct/r=0.414 and r_tet/r=0.225. Find, in pm (nearest intege... JEE Advanced level
Using the limiting ranges: CN 3 for 0.155-0.225, CN 4 for 0.225-0.414, CN 6 for 0.414-0.732, CN 8 for 0.732-1.0, which statements are correct? JEE Advanced level
In one unit cell of an fcc (ccp) lattice, which statements are correct? JEE Advanced level
A ccp lattice contains 0.5 mol of atoms, N_A=6.022x10^23 mol^-1. Which statements are correct? JEE Advanced level
The packing efficiency of a cubic close packed (face-centred cubic) arrangement of identical spheres is NEET level
In a close packed structure of N identical atoms, the number of tetrahedral voids is NEET level
A close packed structure with the repeating layer sequence ABABABldots is called NEET level
The coordination number of an atom in a body centred cubic (bcc) lattice is NEET level
The ratio of the packing efficiency of a bcc lattice to that of a simple cubic lattice (identical spheres) is closest to JEE Main level
Anions of radius 200 pm form a ccp lattice. The radius of the largest sphere that fits exactly into a tetrahedral void is closest to JEE Main level
In a compound the anion X forms a ccp lattice and the cation M occupies two-thirds of the octahedral voids. The formula of the compound is JEE Main level
For the same atomic radius, the ratio of the unit cell edge of an fcc metal to that of a bcc metal is JEE Main level
An element crystallises in the fcc lattice with unit cell edge 400 pm. Taking sqrt2=1.414, calculate the atomic radius in pm (nearest integer). JEE Main level
A metal of molar mass 50.0 g mol^-1 crystallises in a bcc lattice with edge 300 pm. Use N_A = 6.022x10^23 mol^-1. Calculate its density in g cm^-3 (two decimals... JEE Main level
A sample of 5.4 g of aluminium (M=27 g mol^-1) is a ccp crystal. Use N_A = 6.022x10^23 mol^-1. The number of tetrahedral voids in the sample is xx10^22. Find x ... JEE Main level
Which of the following statements about cubic close packing (ccp) of identical spheres are correct? JEE Main level
In a spinel-type oxide the oxide ions form a ccp lattice. Cation A occupies one-eighth of the tetrahedral voids and cation B occupies one-half of the octahedral... JEE Advanced level
Identical spheres of radius R form an fcc lattice and smaller spheres of radius exactly (sqrt3/2-1)R are placed in every tetrahedral void. Take pi=3.14. The fra... JEE Advanced level
A metal of molar mass 100 g mol^-1 crystallises in the fcc lattice and has density 12.0 g cm^-3. Use N_A = 6.022x10^23 mol^-1. Taking sqrt2=1.414, calculate the... JEE Advanced level
A metal of atomic mass 24 g mol^-1 has an hcp structure. The hexagonal unit cell contains 6 atoms and its volume is 24sqrt2 r^3 for the ideal c/a ratio. For r=1... JEE Advanced level
Consider the voids in an fcc unit cell of edge a. Which statements are correct? JEE Advanced level
For identical spheres of radius r arranged in simple cubic (sc), bcc and fcc lattices, which statements are correct? JEE Advanced level
Which statements comparing hcp and ccp arrangements of identical spheres are correct? JEE Advanced level