Crystal System and Bravais Lattice

Q. Assertion A particle present at the corner of face centered unit cell has 1/8 of its contribution of the unit cell Reason In any space lattice, the corner of the unit cell is always shared by the eight unit cells 1)A 2)B 3)C 4)D

Q. what are the number of atoms per unit cell and the number of nearest neighbours in a simple cubic structure

Q. Tetragonal crystal system has the following unit cell dimensions:

1. $a=b=c$ and $\alpha =\beta =\gamma ={90}^{\circ }$
2. $a=b\ne c$ and $\alpha =\beta ={90}^{\circ }$, $\gamma ={120}^{\circ }$
3. $a\ne b\ne c$ and $\alpha =\beta =\gamma ={90}^{\circ }$
4. $a=b\ne c$ and $\alpha =\beta =\gamma ={90}^{\circ }$

Q. 41. If A is filled in half of tetrahedral voids as well as octahedral voids in equal amount in a ccp lattice formed by oxide ion then formula of solid will be ?

Q. 0.2g of a gas X occupies a volume of 440 ml . If 0.1g of carbon dioxide occupies a volume of 320 ml at the same temperature & pressure . Gas X would be (1) O_2 (2) SO_2 (3) NO (4) C_4H_{10

Q. In a face-centered cubic lattice, a unit cell is shared equally by how many unit cells? (1)2 (2) 4 (3)6 (4) 8

Q. 6.If compound MX4 has mew=0 then most probable geometry is •trigonal bipyramidal •square bipyramidal •tetrahedral

Q. how square close packing gives rise to primitive cubic unit cell

Q. Which of the following defects in the crystals may lower the density?

1. Frenkel defect
2. Schottky defect
3. All of the above
4. Interstitial defect

Q. 18.A sampal of nitrogen occupies a volume of 350 cm3 at STP.Then, its volume at 550K and 0.5atm pressure is approximately (a) 1280 cm3 (b) 1409 cm3 (c) 1050 cm3 (d) 1428 cm3

Q.

Write a note on the introduction to geometry.

Q. In a face centered cubic lattice, a unit cell is shared equally by how many unit cells?

Q. One litre of carbon dioxide is passes through red hot coke. The volume becomes 1.4 litres at same temperature or pressure. Write the composition of the products .

Q. 7. What is the type of unit cell present in hcp (hexagonal closed packing) lattice?

Q. baloonA balloon blown up with 1 mole of gas has a volume of 480 mL at 14 C. At this stage, 15.(7/8)th of its maximum capacity. Suggest:(A) Will the halloon burst at 30^° C?it willof these(B) The minimum temperature at w(4)None(3) No, 44 C(2) Yes, 55^° C(1) No, 55^° C

Q. One litre of CO_2 is passed through red hot coke.The volume becomes 1.4 litres at sametemperature and pressure. The composition ofproducts is

Q. Match the following crystal system with their Bravais lattice

1. $\mathrm{Primitive},\mathrm{bcc},\mathrm{fcc}$
2. $\mathrm{Primitive},\mathrm{bcc},\mathrm{fcc},\mathrm{end}-\mathrm{centered}$
3. $\mathrm{Primitive}$
4. $\mathrm{End}\mathrm{centered},\mathrm{Primitive},$

Q. The volume of air needed for complete conversion of 100cc of NO to NO2 will be-1)500cc, 2)100cc, 3)250cc, 4)1250cc. 2NO(g)+O2(g)=2NO2(g) .

Q. What is RANK of end centered cube

Q. 17.When ZnO latticeis heated the formula of the lattice becomes (x>0)?

Q.

35 ML OF OXYGEN WERE COLLECTED AT 6 DEGREE CELCIUS AND 758 MM PRESSURE. CALCULATE ITS VOLUME AT NTP? WHAT IS THE VALUE OF T₂ HERE.

Q. The partial pressure of ethane over a saturated solution containing $6.56\times {10}^{-2}g$ of ethane in water is 1 bar. If the solution contains $5\times {10}^{-2}g$ of ethane, then what shall be the partial pressure of the gas ?

Assume: $n_{H_{2}O}>>n_{ethane}$

1. $0.2bar$
2. $1.55bar$
3. $0.76bar$
4. $2bar$

Q. Using vsepr theory, predict the geometry of XeF^+5 ion

Q. Calculate the volume at STP of 320 ml of gas collected over water at 760 mm pressure and 380 K temperature. Vapour pressure of water at 380 K is 48 mm

Q.

How many space lattices are obtainable from the different crystal systems

[MP PMT 1996; MP PET/PMT 1998]

1. 7

2. 14

3. 32

4. 230

Q. A 5 L flask containing N2 at 1 bar and 25°C is connected to a 4L flask containing N2 at 2 bar and 0°C. After the gases are allowed to mix keeping both flasks at their original temperature, what will be the pressure and amount of N2 in the 5L flask assuming ideal gas behaviour?

Q.

Match the following:

$\begin{array}{cc}ColumnI& ColumnII\\ 1.Hexagonal& \left(i\right)a=b=c\\ 2.Cubic& \left(ii\right)a\ne b\ne c\\ 3.Triclinic& \left(iii\right)a=b\ne c\\ 4.Monoclinic& \left(iv\right)\alpha =\beta =\gamma =90{}^{\circ }\\ 5.Tetragonal& \left(v\right)\alpha =\gamma =90{}^{\circ },\beta \ne 90{}^{\circ }\\ 6.Rhombohedral& \left(vi\right)\alpha \ne \beta \ne \gamma \ne 90{}^{\circ }\\ 7.Orthorhombic& \left(vii\right).\alpha =\beta =\gamma \ne 90{}^{\circ }\\ & \left(viii\right)\alpha =\beta =90{}^{\circ },\gamma =120{}^{\circ }\end{array}$

1. (1)–(iii), (viii); (2)–(i), (iv); (3)–(ii), (vi); (4)-(ii), (v); (5)–(iii), (iv); (6)–(i) (vii); (7)–(ii), (iv)

2. (1)–(ii), (vii); (2)–(i), (vii); (3)–(iii), (iv); (4)-(i), (v); (5)–(ii), (vi); (6)–(i) (vi); (7)–(i), (iv)

3. (1)–(ii), (vii); (2)–(i), (iv); (3)–(ii), (vi); (4)-(ii), (v); (5)–(ii), (iv); (6)–(i) (viii); (7)–(iii), (iv)

4. (1)–(ii), (vii); (2)–(i), (iv); (3)–(ii), (vi); (4)-(ii), (iv); (5)–(i), (viii); (6)–(iii) (iv); (7)–(iii), (vii)

Q. one litre of CO_{2 }is passed through red hot coke. the volume becomes 1.4 litres at same temperature and pressure.the composition of products i

Q. a gas occupied a volume of 84ml at -73 ?c and380 mm what would its volume be at 27?c and 570 mm pressure

Q. A given metal crystallizes out with a cubic structure having edge length of $361pm$. If there are four metal atoms in one unit cell, what is the radius of one atom?
(AIPMT 2015)

1. $80pm$
2. $108pm$
3. $127pm$
4. $40pm$