# A metal has a fcc lattice. The edge length of the unit cell is 404 pm. The density of the metal is 2.72 g cm–3. The molar mass of the metal is: (NA Avogadro's constant = 6.02 × 1023 mol–1) 1. 30 g mol–1 2. 27 g mol–1 3. 20 g mol–1 4. 40 g mol–1

Subtopic:  Density & Packing Fraction |
74%
From NCERT
AIPMT - 2013
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A metal crystallizes with a fcc lattice. The edge of the unit cell is 408 pm. The diameter of the metal atom is:

1. 288 pm

2. 408 pm

3. 144 pm

4. 204 pm

Subtopic:  Density & Packing Fraction |
73%
From NCERT
AIPMT - 2012
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Lithium metal crystallizes in a body-centered cubic crystal. If the length of the side of the unit cell of lithium is 351 pm, the atomic radius of the lithium will be:

1. 240.8 pm

2. 151.8 pm

3. 75.5 pm

4. 300.5 pm

Subtopic:  Introduction & Crystal System |
84%
From NCERT
AIPMT - 2009
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If 'a’ stands for the edge length of the cubic systems: simple cubic, body-centered cubic, and face-centered cubic, then the ratio of radii of the spheres in these systems will be respectively:

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

2. $\frac{1}{2}\mathrm{a :}$ $\sqrt{3}\mathrm{a}$ $:$ $\frac{1}{\sqrt{2}}\mathrm{a}$

3. $\frac{1}{2}\mathrm{a :}$ $\frac{\sqrt{3}}{2}\mathrm{a}$ $:$ $\frac{\sqrt{2}}{2}\mathrm{a}$

4. $1\mathrm{a :}$ $\sqrt{3}\mathrm{a}$ $:$ $\sqrt{2}\mathrm{a}$

Subtopic:  Voids, Radius Ratio & Coordination Number |
86%
From NCERT
AIPMT - 2008
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The appearance of colour in solid alkali metal halides is generally due to:

1. F-centres.

2. Schottky defect.

3. Frenkel defect.

4. Interstitial positions.

Subtopic:  Imperfections in Solids & Semiconductors |
80%
From NCERT
AIPMT - 2006
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The ionic radii of A+ and B- ions are 0.98 x10-10 m and 1.81 x10-10 m. The coordination number of each ion in AB is:
1. 8
2. 2
3. 6
4. 4
Subtopic:  Voids, Radius Ratio & Coordination Number |
70%
NEET - 2016
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The incorrect statement among the following is -

 1 Density decreases in case of crystals with Schottky's defect. 2 NaCl(s) is insulator, silicon is semiconductor, silver is conductor, quartz is piezo electric crystal. 3 Frenkel defect is favoured in those ionic compounds in which sizes of cations and anions have large difference. 4 $$Fe_{0.98}O$$ has non stoichiometric metal excess defect.
Subtopic:  Imperfections in Solids & Semiconductors |
53%
From NCERT
NEET - 2017
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If NaCl is doped with ${10}^{-5}$ mol% of $SrC{l}_{2}$, the number of cation vacancies will be -

1. $6.02×{10}^{16}$

2. $6.02×{10}^{18}$

3. $6.02×{10}^{20}$

4. 2$×6.02×{10}^{23}$

Subtopic:  Density & Packing Fraction |
59%
From NCERT
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The unit cell dimensions of a cubic lattice (edges a, b, c and the angles between them, α, β, γ) are :

1. a = b = c,

2. a = b c,

3. a = b = c,

4. a c,

Subtopic:  Introduction & Crystal System |
94%
From NCERT
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The formula of nickel oxide with metal deficiency defect in its crystal is $N{i}_{0.98}O$. The crystal contains  ions. The fraction of nickel existing as $N{i}^{2+}$ ions in the crystal is-

1. 0.96

2. 0.04

3. 0.50

4. 0.31

Subtopic:  Density & Packing Fraction |
75%
From NCERT
NEET - 2019
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