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question_answer1)
The formula for determination of density of unit cell is
A)
\[\frac{{{a}^{3}}\times {{N}_{o}}}{N\times M}g\,c{{m}^{-3}}\] done
clear
B)
\[\frac{N\times M}{{{a}^{3}}\times {{N}_{o}}}g\,c{{m}^{-3}}\] done
clear
C)
\[\frac{{{a}^{3}}\times M}{N\times {{N}_{o}}}g\,c{{m}^{-3}}\] done
clear
D)
\[\frac{M\times {{N}_{o}}}{{{a}^{3}}\times N}g\,c{{m}^{-3}}\] done
clear
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question_answer2)
Potassium fluoride has \[NaCl\] type structure. What is the distance between \[{{K}^{+}}\] and \[{{F}^{-}}\] ions if cell edge is \[a\,\,cm\]
A)
\[2a\,\,cm\] done
clear
B)
\[a/2\,\,cm\] done
clear
C)
\[4a\,\,cm\] done
clear
D)
\[a/4\,\,cm\] done
clear
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question_answer3)
An element occurring in the \[bcc\] structure has \[12.08\times {{10}^{23}}\] unit cells. The total number of atoms of the element in these cells will be [MP PET 1994]
A)
\[24.16\times {{10}^{23}}\] done
clear
B)
\[36.18\times {{10}^{23}}\] done
clear
C)
\[6.04\times {{10}^{23}}\] done
clear
D)
\[12.08\times {{10}^{23}}\] done
clear
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question_answer4)
If an atom is present in the centre of the cube, the participation of that atom per unit cell is
A)
\[\frac{1}{4}\] done
clear
B)
1 done
clear
C)
\[\frac{1}{2}\] done
clear
D)
\[\frac{1}{8}\] done
clear
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question_answer5)
For an ionic crystal of the general formula \[AX\] and coordination number 6, the value of radius ratio will be [MP PMT 1993]
A)
Greater than 0.73 done
clear
B)
In between 0.73 and 0.41 done
clear
C)
In between 0.41 and 0.22 done
clear
D)
Less than 0.22 done
clear
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question_answer6)
The number of spheres contained (i) in one body centred cubic unit cell and (ii) in one face centred cubic unit cell, is
A)
In (i) 2 and in (ii) 4 done
clear
B)
In (i) 3 and in (ii) 2 done
clear
C)
In (i) 4 and in (ii) 2 done
clear
D)
In (i) 2 and in (ii) 3 done
clear
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question_answer7)
\[CsBr\] crystal has \[bcc\] structure. It has an edge length of \[4.3\,\,{AA}.\] The shortest interionic distance between \[C{{s}^{+}}\] and \[B{{r}^{-}}\]ions is [IIT 1995]
A)
\[1.86\,\,{AA}\] done
clear
B)
\[3.72\,\,{AA}\] done
clear
C)
\[4.3\,\,{AA}\] done
clear
D)
\[7.44\,\,{AA}\] done
clear
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question_answer8)
In octahedral holes (voids)
A)
A simple triangular void surrounded by four spheres done
clear
B)
A bi-triangular void surrounded by four spheres done
clear
C)
A bi-triangular void surrounded by six spheres done
clear
D)
A bi-triangular void surrounded by eight spheres done
clear
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question_answer9)
Bragg's law is given by the equation [MP PMT 1995, 2002]
A)
\[n\lambda =2\theta \sin \theta \] done
clear
B)
\[n\lambda =2d\sin \theta \] done
clear
C)
\[2n\lambda =d\sin \theta \] done
clear
D)
\[n\frac{\theta }{2}=\frac{d}{2}\sin \theta \] done
clear
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question_answer10)
The number of atoms in \[100\,\,g\] of an \[fcc\] crystal with density \[d=10\,\,g/c{{m}^{3}}\] and cell edge equal to \[100\,\,pm,\]is equal to [CBSE PMT 1994; KCET 2002]
A)
\[4\times {{10}^{25}}\] done
clear
B)
\[3\times {{10}^{25}}\] done
clear
C)
\[2\times {{10}^{25}}\] done
clear
D)
\[1\times {{10}^{25}}\] done
clear
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question_answer11)
In the crystals of which of the following ionic compounds would you expect maximum distance between centres of cations and anions [CBSE PMT 1998]
A)
\[LiF\] done
clear
B)
\[CsF\] done
clear
C)
\[CsI\] done
clear
D)
\[LiI\] done
clear
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question_answer12)
The number of unit cells in \[58.5\,g\] of \[NaCl\] is nearly [MP PMT 2000, 01]
A)
\[6\times {{10}^{20}}\] done
clear
B)
\[3\times {{10}^{22}}\] done
clear
C)
\[1.5\times {{10}^{23}}\] done
clear
D)
\[0.5\times {{10}^{24}}\] done
clear
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question_answer13)
How many unit cells are present in a cube-shaped ideal crystal of \[NaCl\] of mass \[1.00\,g\] [Atomic masses: \[Na=23,\,Cl=35.5]\] [AIEEE 2003]
A)
\[2.57\times {{10}^{21}}\] unit cells done
clear
B)
\[5.14\times {{10}^{21}}\] unit cells done
clear
C)
\[1.28\times {{10}^{21}}\] unit cells done
clear
D)
\[1.71\times {{10}^{21}}\] unit cells done
clear
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question_answer14)
In the Bragg?s equation for diffraction of X-rays, n represents for [MP PMT 2000]
A)
Quantum number done
clear
B)
An integer done
clear
C)
Avogadro?s numbers done
clear
D)
Moles done
clear
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question_answer15)
In a face centred cubic cell, an atom at the face contributes to the unit cell [Karnataka (Engg./Med.) 2000; AFMC 2001]
A)
1/4 part done
clear
B)
1/8 part done
clear
C)
1 part done
clear
D)
1/2 part done
clear
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question_answer16)
The interionic distance for cesium chloride crystal will be [MP PET 2002]
A)
a done
clear
B)
\[\frac{a}{2}\] done
clear
C)
\[\frac{\sqrt{3}a}{2}\] done
clear
D)
\[\frac{2a}{\sqrt{3}}\] done
clear
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question_answer17)
Sodium metal crystallizes as a body centred cubic lattice with the cell edge 4.29 Å. What is the radius of sodium atom [AIIMS 1999]
A)
\[1.857\times {{10}^{-8}}cm\] done
clear
B)
\[2.371\times {{10}^{-7}}cm\] done
clear
C)
\[3.817\times {{10}^{-8}}cm\] done
clear
D)
\[9.312\times {{10}^{-7}}cm\] done
clear
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question_answer18)
For an ionic crystal of the type \[AB,\] the value of (limiting) radius ratio is 0.40. The value suggests that the crystal structure should be
A)
Octahedral done
clear
B)
Tetrahedral done
clear
C)
Square planar done
clear
D)
Plane triangle done
clear
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question_answer19)
Potassium has a \[bcc\] structure with nearest neighbour distance \[4.52\,\,{AA}.\] Its atomic weight is 39. Its density (in \[kg\,\,{{m}^{-3}}\]) will be [AIIMS 1991]
A)
454 done
clear
B)
804 done
clear
C)
852 done
clear
D)
908 done
clear
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question_answer20)
If the value of ionic radius ratio \[\left( \frac{{{r}_{c}}}{{{r}_{a}}} \right)\] is 0.52 in an ionic compound, the geometrical arrangement of ions in crystal is
A)
Tetrahedral done
clear
B)
Planar done
clear
C)
Octahedral done
clear
D)
Pyramidal done
clear
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question_answer21)
The number of atoms/molecules contained in one face centred cubic unit cell of a monoatomic substance is [CPMT 1989, 94; CBSE PMT 1989, 96; NCERT 1990; MP PET 1993; KCET 1999]
A)
1 done
clear
B)
2 done
clear
C)
4 done
clear
D)
6 done
clear
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question_answer22)
The number of atoms/molecules contained in one body centered cubic unit cell is
A)
1 done
clear
B)
2 done
clear
C)
4 done
clear
D)
6 done
clear
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question_answer23)
It the distance between \[N{{a}^{+}}\] and \[C{{l}^{-}}\] ions in sodium chloride crystal is \[X\]pm, the length of the edge of the unit cell is [KCET 2004]
A)
4X pm done
clear
B)
X/4 pm done
clear
C)
X/2 pm done
clear
D)
2X pm done
clear
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question_answer24)
The edge of unit cell of FCC \[Xe\] crystal is \[620\,pm\]. The radius of \[Xe\] atom is [MP PET 2004]
A)
219.25 Pm done
clear
B)
235.16 Pm done
clear
C)
189.37 Pm done
clear
D)
209.87 Pm done
clear
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question_answer25)
In orthorhombic, the value of \[a,\,b\] and \[c\] are respectively \[4.2{AA},\,8.6{AA}\] and \[8.3{AA}\]. given the molecular mass of the solute is \[155\,gm\,mo{{l}^{-1}}\] and that of density is \[3.3\,gm/cc\], the number of formula units per unit cell is [Orrisa JEE 2005]
A)
2 done
clear
B)
3 done
clear
C)
4 done
clear
D)
6 done
clear
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question_answer26)
A metal has bcc structure and the edge length of its unit cell is\[3.04{AA}\]. The volume of the unit cell in \[c{{m}^{3}}\] will be [Orrisa JEE 2005]
A)
\[1.6\times {{10}^{21}}c{{m}^{3}}\] done
clear
B)
\[2.81\times {{10}^{-23}}c{{m}^{3}}\] done
clear
C)
\[6.02\times {{10}^{-23}}c{{m}^{3}}\] done
clear
D)
\[6.6\times {{10}^{-24}}c{{m}^{3}}\] done
clear
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question_answer27)
In face centred cubic unit cell edge length is [DPMT 2005]
A)
\[\frac{4}{\sqrt{3}}r\] done
clear
B)
\[\frac{4}{\sqrt{2}}r\] done
clear
C)
\[2r\] done
clear
D)
\[\frac{\sqrt{3}}{2}r\] done
clear
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