# Copper crystallizes into an fcc lattice with an edge length of 3.61 × 10−8 cm. The density of copper crystal will be -  1. 7.46 g cm-3 2. 9.67 g cm-3 3. 8.96 g cm-3 4. 5.63 g cm-3

Subtopic:  Density & Packing Fraction |
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Nickel oxide has the formula Ni0.98O1.00. The fraction of nickel existing as Ni3+ ions will be -

1. 0.041

2.  0.959

3. 0.736

4. 0.264

Subtopic:  Imperfections in Solids & Semiconductors |
65%
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A ferric oxide crystallizes in a hexagonal close-packed array of oxide ions with two out of every three octahedral holes occupied by ferric ions. The formula of the ferric oxide is-

1. FeO

2. Fe2O3

3. Fe3O4

4. Fe3O2

Subtopic:  Voids, Radius Ratio & Coordination Number |
72%
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A compound forms a hexagonal close-packed structure. The total number of voids in 0.5 moles

of the compound will be -

$1.$ $9.033$ $×$ ${10}^{23}$
$2.$ $3.011$ $×$ ${10}^{23}$
$3.$ $6.023$ $×$ ${10}^{23}$
$4.$ $8.024$ $×$ ${10}^{23}$

Subtopic:  Voids, Radius Ratio & Coordination Number |
53%
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A compound is formed by two elements M and N. The element N forms ccp and atoms of M occupy 1/3rd of tetrahedral voids. The formula of the compound would be -

1. MN

2. M3N4

3. M2N3

4. M3N2

Subtopic:  Voids, Radius Ratio & Coordination Number |
76%
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An element with a molar mass of 2.7 × 10-2 kg mol-1  and density  2.7 × 103 kg m-3  forms a unit cell with an edge length of 405 pm. The type of unit cell is-

1. Simple cubic cell.

2. Face-centered cubic cell.

3. Body-centered cubic cell.

4. None of the above.

Subtopic:  Density & Packing Fraction |
77%
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Silver crystallizes in fcc lattice. If the edge length of the cell is 4.07 × 10−8 cm and density is 10.5 g cm−3, the atomic mass of silver is -

1. 120.31 g ${\mathrm{mol}}^{-1}$

2. 107.9 g ${\mathrm{mol}}^{-1}$

3. 207.60 g ${\mathrm{mol}}^{-1}$

4. 138.52 g ${\mathrm{mol}}^{-1}$

Subtopic:  Density & Packing Fraction |
81%
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The packing efficiency of the face-centered cubic unit cell is:
(assuming that the atoms are touching each other)

1. 52.40 %

2. 68.04 %

3. 74 %

4. 79.06 %

Subtopic:  Density & Packing Fraction |
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Select the correct option based on statements below:

 Assertion (A): The stability of a crystal is reflected by the magnitude of its melting point. Reason (R): Greater the intermolecular forces of attraction, the higher will be the stability and melting point of the substance.

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 Both (A) and (R) are false.
Subtopic:  Introduction & Crystal System |
87%
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The pair having only molecular solids among the following is -

1. Brass and SiC

2. Ammonium phosphate (NH4)3PO4

3. SiC and plastic

4. Tetra phosphorus decaoxide (P4O10) and I2

Subtopic:  Introduction & Crystal System |
67%
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