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Classification of solids and crystal lattices

36 questions on Classification of solids and crystal lattices from the Solid State chapter: 7 NEET level, 14 JEE Main, 15 JEE Advanced. Each one opens with its answer and solution.

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Which of the following is a molecular solid? NEET level
The coordination number of an atom in a cubic close packed (ccp) structure is NEET level
Which statement about amorphous solids is correct? NEET level
The number of atoms present per unit cell of a body-centred cubic (bcc) lattice of identical atoms is NEET level
A sample of 5.4 g of aluminium (M=27 g mol^-1, ccp structure) is considered. Using N_A = 6.022x10^23 mol^-1, find the number of tetrahedral voids in the sample,... JEE Main level
Which of the following statements about crystal systems are correct? JEE Main level
A crystal has a=bneq c with alpha=beta=gamma=90 deg. The crystal system is JEE Main level
Among Cu, KCl, SiC and solid argon, the solid with the highest melting point is JEE Main level
The number of tetrahedral voids present in 2 mol of a hexagonal close packed solid is (take N_A=6.022x10^23) JEE Main level
According to the radius-ratio rule (limiting ratios 0.225, 0.414, 0.732), which ion pair is expected to have coordination number 8 for the cation? Radii (pm): JEE Main level
Which statement about quartz and quartz glass is correct? JEE Main level
In an oxide, O^2- ions form a ccp lattice of cell edge 408 pm. Atoms A (molar mass 24) occupy one-eighth of the tetrahedral voids and atoms B (molar mass 27) oc... JEE Advanced level
A rock-salt type unit cell has cations M at the corners and face centres and anions X at the edge centres and the body centre. All ions lying on one body diagon... JEE Advanced level
Which of the following statements about close-packed structures are correct? JEE Advanced level
Using the radius-ratio limits (0.225-0.414 for CN 4, 0.414-0.732 for CN 6, 0.732-1.000 for CN 8), which of the following predictions are correct? (Radii in pm.) JEE Advanced level
Anions X form a ccp lattice containing N anions. Cations A occupy some of the voids. Which of the following formula assignments are correct? JEE Advanced level
In a crystal, atoms A form an fcc lattice, atoms B occupy three-quarters of the tetrahedral voids and atoms C occupy half of the octahedral voids. The simplest ... JEE Advanced level
A salt MX has r(M^+)=100 pm and r(X^-)=181 pm. Using the radius-ratio rule (and sqrt2=1.414, sqrt3=1.732), the coordination number of M and the unit cell edge l... JEE Advanced level
Which of the following is a covalent (network) solid? NEET level
Which of the following is a characteristic of amorphous solids? NEET level
The total number of Bravais lattices in three dimensions is NEET level
A crystal has unit cell parameters a=bneq c and alpha=beta=gamma=90 deg. The crystal system is JEE Main level
Assertion (A): Ionic solids are hard and brittle. Reason (R): Ionic solids are held by strong electrostatic forces and a shift of layers brings ions of like cha... JEE Main level
The number of atoms per unit cell of an end-centred (base-centred) cubic-type cell with atoms at 8 corners and at the centres of two opposite faces is JEE Main level
A solid is very hard, has a very high melting point and does not conduct electricity either in the solid state or in the molten state. It is most likely a JEE Main level
A 5.0 g sample of an element (M=40 g mol^-1) has a bcc structure. Use N_A = 6.022x10^23 mol^-1. The number of unit cells in the sample is xx10^22. Find x (two d... JEE Main level
An element of molar mass 130 g mol^-1 crystallises in a simple cubic lattice with edge 360 pm. Use N_A = 6.022x10^23 mol^-1. Calculate its density in g cm^-3 (t... JEE Main level
Which statements are correct? JEE Main level
A cubic unit cell has atoms Z at six corners and atoms W at the two remaining corners (adjacent along one edge). Atoms X are at the centres of all six faces. Th... JEE Advanced level
In a NaCl-type crystal the anions (radius R) form an fcc lattice and touch each other along the face diagonal. Cations of radius exactly (sqrt2-1)R fill all the... JEE Advanced level
A metal changes from the fcc form to the bcc form on heating, with no change in the atomic radius. The ratio of the density of the bcc form to that of the fcc f... JEE Advanced level
X-ray data show that an fcc metal (M=27 g mol^-1) has an edge of 405 pm, but its measured density is 2.66 g cm^-3 because some lattice sites are vacant. Use N_A... JEE Advanced level
A bcc metal (M=56 g mol^-1) has atomic radius 125 pm. Use N_A = 6.022x10^23 mol^-1. Using sqrt3=1.732, calculate its density in g cm^-3 (two decimals). JEE Advanced level
Which of the following correspondences between a crystal system and its unit cell parameters are correct? JEE Advanced level
Which statements about the number of particles per unit cell are correct? JEE Advanced level
A metal has atomic radius 150 pm. Taking sqrt2=1.414 and sqrt3=1.732, which statements are correct? JEE Advanced level