Chemistry - Solid State - Quiz-4

The space lattice of graphite is

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Cubic
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Tetragonal
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Rhombic
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Hexagonal

The edge length of the cube is 400pm. Its body diagonal would be-

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500 pm
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693 pm
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600 pm
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566pm

A metallic element exists as a cubic lattice. Each edge of the unit cell is 2.88 $\overset{0}{A}$ . The density of the metal is 7.20 g $c m^{- 3}$ . How many unit cell will be present in 100 g of the metal -

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$6.85 \times 10^{2}$
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$5.82 \times 10^{23}$
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$4.37 \times 10^{5}$
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$2.12 \times 10^{6}$

Iron crystallizes in a b.c.c. system with a lattice parameter of 2.861 $\overset{0}{A}$ . Calculate the density of iron in the b.c.c. system (Atomic weight of Fe = 56, $N_{A} = 6.02 \times 10^{23} m o l^{- 1}$ )

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7.92g $m l^{- 1}$
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8.96g $m l^{- 1}$
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2.78g $m l^{- 1}$
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6.72g $m l^{- 1}$

An alloy of copper, silver, and gold is found to have copper constituting the ccp lattice. If silver atoms occupy the edge centers and gold is present at the body center, the alloy has a formula-

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$C u_{4} A g_{2} A u$
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$C u_{4} A g_{4} A u$
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$C u_{4} A g_{3} A u$
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$C u A g A u$

Frenkel defect is not found in the halides of alkali metals because alkali metals have

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high electropositivity
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high ionic radii
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high reactivity
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ability to occupy interstitial sites

Iodine crystal is classified as-

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Metallic solids.
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Ionic solids.
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Molecular solids .
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Covalent solids.

A solid PQ have rock salt type structure in which Q atoms are at the corners of the unit cell. If the body centred atoms in all the unit cells are missing, the resulting stoichiometry will be-

(A) PQ

(B) $P Q_{2}$

(D) $P_{4} Q_{3}$

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4

At room temperature, sodium crystallizes in a body-centered cubic cell with a 4.24 $\overset{0}{A}$ . The theoretical density of sodium is- (Atomic mass of sodium=23.0 g $m o l^{- 1}$ )

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() $2.05 g c m^{- 3}$
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() $3.45 g c m^{- 3}$
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() $1.00 g c m^{- 3}$
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() $3.55 g c m^{- 3}$

Which is amorphous solids-

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Rubber
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Plastic
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Glass
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All

In the unit cell of an fcc system, the number of octahedral and tetrahedral holes are

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4,4
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4, 8
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1, 8
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4, 1

Xenon crystallizes in face center cubic lattice and the edge of the unit cell is 620 pm, then the radius of the Xenon atom is-

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219.20 pm
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438.5 pm
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265.5 pm
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536.94 pm

The unit cell of a metallic element of atomic mass 108 and density 10.5 g/ $c m^{2}$ is a cube with edge length of 409 pm. The structure of the crystal lattice is-

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fcc
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bcc
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hcp
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None of these

In a cubic unit cell, atom A is present at each corner, atom B at each face centre and atom C at the body centre. The simplest formula of the solid is :

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${AB}_{2} C$
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$A_{2} BC$
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${AB}_{3} C$
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${ABC}_{3}$

The unit cell dimensions of a cubic lattice (edges a, b, c and the angles between them, $α, β, γ$ ) are :

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a=b=c, $α = β = γ = 90 °$
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a=b $\neq$ c, $α = β = γ = 90 °$
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a=b=c, $α = γ = 90 °, β \neq 90 °$
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a $\neq$ b $\neq$ c, $α = β = 90 °, γ \neq 90 °$

Copper metal has a face-centered cubic structure with the unit cell length equal to 0.361 nm. Picturing copper ions in contact along the face diagonal. The apparent radius of a copper ion is-

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() 0.128
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() 1.42
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() 3.22
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() 4.22

Choose the correct matching sequence from the possibilities given

(a) Crystal defect	(i) AB AB AB. . . . type crystal
(b) hcp	(ii) Covalent crystal
(c) CsCl	(iii) Frenkel
(d) Diamond	(iv) Face centered in cube
(e) NaCl	(v) Body centered in cube

	(a)	(b)	(c)	(d)	(e)
(1)	(iii)	(i)	(ii)	(v)	(iv)
(2)	(iii)	(i)	(v)	(ii)	(iv)
(3)	(iii)	(v)	(i)	(ii)	(iv)
(4)	(v)	(iii)	(iv)	(ii)	(i)

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A compound alloy of gold and copper crystallizes in a cube lattice in which the gold atoms occupy the lattice points at the corners of a cube and the copper atoms occupy the centres of each of the cube faces. The formula of this compound is-

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AuCu
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$A u C u_{2}$
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$A u C u_{3}$
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None of these

(a) The coordination number of a cation occupying a tetrahedral hole is 4.

(b) The coordination number of a cation occupying an octahedral hole is 6.

The correct statement(s) among the above is -

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a, b
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b, c
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a, b, c
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a, c

Among the following types of voids, which one is the largest void-

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Triangular system
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Tetragonal system
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Monoclinic system
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Octahedral

Bragg’s equation is-

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$n λ = 2 θ \sin θ$
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$n λ = 2 d \sin θ$
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$2 n λ = d \sin θ$
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$λ = (2 d / n) \sin θ$

The n of a cubic unit cell is 4. The type of cell as-

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Body centred
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Face centred
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Primitive
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None of these

Close packing is maximum in the crystal which is-

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Simple cube
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bcc
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fcc
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None

In a face centred cubic arrangement of metallic atoms, what is the relative ratio of the sizes of tetrahedral and octahedral voids ?

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0.543
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0.732
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0.414
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0.637

A rhombohedral unit cell is shown. What is its volume ?
Side length = a Å.

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$\frac{a^{3}}{\sqrt{3}}$
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$a^{3} \frac{\sqrt{3}}{2}$
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$\frac{a^{3}}{\sqrt{2}}$
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$a^{3} \sqrt{\frac{3}{2}}$

A crystal formula $A B_{3}$ has A ions at the cube corners and B ions at the edge centers. The coordination numbers of A and B are respectively

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6 and 6
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2 and 6
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6 and 2
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8 and 8

A metal crystallizes in two cubic phases, face centred cubic (fcc) and body centred cubic (bcc) whose unit cell length are 3.5 and 3.0 Å respectively. Calculate the ratio of density of fcc and bcc.

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2.123
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1.259
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5.124
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3.134

Assertion : The stability of a crystal gets reflected in its melting point.

Reason : The stability of a crystal depends upon the strength of the interparticle attractive force. The melting point of a solid depends on the strength of the attractive force acting between the constitutent particles.

If both the assertion and the reason are true and the reason is a correct explanation of the assertion
If both the assertion and reason are true but the reason is not a correct explanation of the assertion
If the assertion is true but the reason is false
If both the assertion and reason are false

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Assertion : The melting point decreases in the order.
Water > ethyl alcohol > diethylether > methane

Reason : The strength of the intermolecular forces between these molecules follow the order
Water > ethyl alcohol > diethylether > methane

If both the assertion and the reason are true and the reason is a correct explanation of the assertion
If both the assertion and reason are true but the reason is not a correct explanation of the assertion
If the assertion is true but the reason is false
If both the assertion and reason are false

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4

Iron exhibits bcc structure at room temperature. Above 900 °C, it transforms to fcc structure. The ratio of density of iron at room temperature to that at 900 °C is -

(Molar mass and atomic radii of iron remains constant with temperature)

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

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Practice Chemistry Quiz Questions and Answers

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Practice Chemistry Quiz Questions and Answers

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