Types of Unit Cell

Q. Select the incorrect statement in a CsCl crystal:(a) Cs forms a simple cubic lattice, Cl forms a simple cubic lattice(b) Cl occupies body centre of Cs(c) Cs occupies body centre of Cl(d) It is impossible for CI to occupy body centre of Cs because the body centre void of Cs issmaller than Cl ion size

Q. 14. Number of tetrahedral void(s) per atom present in cubic closed pack structure is: a) 2 b) 4 c) 8 d) 1

Q. in a closed packed structure of mixed oxides, the lattice is composed of oxide ions, 1/8th of tetrahedral voids are occupied by trivalent cation(A3+) and 1/4th of octahedral voidsare occupied by divalent cation (B2+). Find the formula of ox

Q. 20. Lithium crystallizes in a body-centered cubic lattice, how many next nearest neighbours does each Lithium has ? 1. 8 2. 6 3. 12 4. 4

Q. A forms FCC system keeping B at all edge centers and body center .If all the atoms present on one body diagonal plane are removed , molecular formula of the final crystal will be - A )AB B)A2B C)AB2 D)A2B3

Q. Consider the given statements S, 1: Space lattice is an abstract scaffolding for crystal structure S2:Cystal structure is obtained by placing motifsign an identical manner on the points of thespace lattice Which of the following is correct?(1) S, is true, S, is false(2) S, is false, S2 is true(3) S, and S2 are both true(4) S, and S2 are both false

Q. 47. Total number of tetrahedral and octahedral voids present inside the hexagonal close packing structure

Q. The fraction of total volume occupied by the atoms present in simple cube is

Q. What is central atom ?how to find it?

Q. The number of squares in a truncated octahedron are:

Q. An element crystallises in a face-centred cubic (fcc) unit cell with edge length $a$. The distance between the centres of two nearest octahedral voids in the crystal lattice is:
(JEE Main 2020)

1. $\frac{a}{\sqrt{2}}$
2. $a$
3. $\sqrt{2}a$
4. $\frac{a}{2}$

Q. a) what is lattice energy? b) what is lattice enthalpy in the formation of ionic bond? c) how packing of ions of opposite charges occur to form ionic solid?

Q. In sodium chloride, $C{l}^{-}$ ions form ccp arrangement. Which site will $N{a}^{+}$ ions occupy in this structure?

1. Trigonal bipyramidal
2. Cubic
3. Tetragonal
4. Octahedral

Q. Predict the general formula for the given unit cell.

1. $XYWZ$
2. $X_2{Y}_2{W}_{2}Z$
3. $X_3{Y}_3{W}_{2}Z$
4. $X_3{Y}_2{W}_{2}Z$

Q. 11 A given metal crystalises out with a cubic structure having edge lenght of 361pm. If there are four metal atom in one unit cell, what is the radius of one atom?

Q. How many space lattices (bravais lattices) are obtainable from the different crystal systems?

Q. Stacking of a second layer of sphere over the first layer of 2-D hexagonal close packing will result in formation of:

1. Both tetrahedral and octahedral voids
2. Only triangular voids
3. Only tetrahedral voids
4. Only octahedral voids

Q. What is the coordination number of hexagonal close packing (hcp) lattice?

1. 12
2. 8
3. 4
4. 6

Q. 43. In a crystalline solid, anions Y are arranged in ccp lattice and cations X are distributed in octahedral and tetrahedral voids.If all the octahedral voids are occupied, What is the formula of the solid?

Q. What is the distinguishing layer between hexagonal close packing and cubic close packing?

1. All of the above
2. First layer
3. Second layer
4. Third layer

Q. Crystals can be classified into....... basic crystal systems.

1. 3
2. 7
3. 4
4. 14

Q. Lithium forms body centred cubic structure. The length of the side of its unit cell is $360\text{pm}$. Atomic radius (in pm) of the lithium will be
(Given $\sqrt{3}=1.7$)

Q. How many space lattices (bravais lattices) are obtainable from the different crystal systems?

1. 4
2. 14
3. 8
4. 7

Q. 36. Total number of phosphorous atoms present in 105g of calcium phosphate is(approximately)

Q. Crystal system 'A' has all the edge lengths as same, $a=b=c$. Which of the following is the possible crystal system for the given crystal 'A'?

1. Both (a) and (b)
2. Rhombohedral
3. None of the above
4. Cubic

Q. What is the distinguishing layer between hexagonal close packing and cubic close packing?

1. First layer
2. Third layer
3. Second layer
4. All of the above

Q. In a simple cubic lattice of anions, the side length of the unit cell is $3.0\stackrel{o}{A}.$ The diameter of the void in the body centre is

1. $0.46\stackrel{o}{A}$
2. $2.2\stackrel{o}{A}$
3. $4.9\stackrel{o}{A}$
4. $1.7\stackrel{o}{A}$

Q. 2x 281=562 pm33. The coordination number of a metal crystallizing inhexagonal close packing structure is(a) 12(C) 8(b) 4(d) 6

Q.

What is coordination number/

Q. IP of Be is more than B. Why