Possess orderly arrangement over long distances

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Solid state practice · Mixed difficulty

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Showing 91-120 of 238 questions

91 Easy

91 of 238

Analyzing +4 | -1

Among the following which one has the highest cation to anion size ratio?

View answer and explanation

Correct option: C

\mathrm{CsF}

Option C (CsF) is correct because Cs has the largest cation size and F has the smallest anion size among the given options, leading to the highest cation to anion size ratio.

92 Easy

92 of 238

Understanding +4 | -1

The radius ratio of

\mathrm{CsCl}

is 0.93. The expected lattice structure is

View answer and explanation

Correct option: D

Body centred cubic

Option D (Body centred cubic) is correct because a radius ratio of 0.93 falls within the range (0.732 - 1.000) that corresponds to a body-centered cubic structure.

93 Easy

93 of 238

Remembering +4 | -1

The crystalline structure of

\mathrm{NaCl}

View answer and explanation

Correct option: B

Face centred cubic

Option B (Face centred cubic) is correct because the crystalline structure of NaCl is a face-centered cubic (FCC) lattice.

94 Medium

94 of 238

Understanding +4 | -1

Crystalline metal can be transformed into metallic glass by:

View answer and explanation

Correct option: D

Very rapid cooling of a spray of the molten metal

Option D (Very rapid cooling of a spray of the molten metal) is correct because rapid cooling prevents the formation of a crystalline structure, resulting in a metallic glass.

95 Medium

95 of 238

Understanding +4 | -1

Amorphous substances show (i) Short and long range order (ii) Short range order (iii) Long range order (iv) Have no sharp melting point

View answer and explanation

Correct option: D

(ii)and (iv) are correct

Option D ((ii)and (iv) are correct) is correct because amorphous substances exhibit short-range order and lack a sharp melting point.

96 Easy

96 of 238

Understanding +4 | -1

For

AX

ionic crystal to exist in bcc structure, the ratio of radii

\left( {\frac{{{r_{\mathrm{cation}}}}}{{{r_{\mathrm{anions}}}}}} \right)

should be

View answer and explanation

Correct option: B

Greater then 0.73

Option B (Greater then 0.73) is correct because for an AX ionic crystal to exist in a bcc structure, the radius ratio must be greater than 0.73.

97 Easy

97 of 238

Understanding +4 | -1

The oxide which shows transition from metal to insulation, i.e., semiconductors are :

View answer and explanation

Correct option: D

All of these

Option D (All of these) is correct because

{\mathrm{V}_2}{\mathrm{O}_3}

\mathrm{V}{\mathrm{O}_2}

, and

\mathrm{T}{\mathrm{i}_2}{\mathrm{O}_3}

all exhibit metal-insulator transitions, behaving as semiconductors.

98 Medium

98 of 238

Remembering +4 | -1

Solid

{CO}_2

is an example of the crystal type -

View answer and explanation

Correct option: D

molecular

Option D (molecular) is correct because solid CO2 (dry ice) consists of CO2 molecules held together by weak van der Waals forces, characteristic of molecular crystals.

99 Hard

99 of 238

Application +4 | -1

Sodium metal crystallizes as a body centred cubic lattice with the cell edge

4.29{A^{^{^ \circ }}}

What is the radius sodium atom?

View answer and explanation

Correct option: A

1.857\mathrm{ \times }{10^{( - 8)}}cm

Option A (

1.857\mathrm{ \times }{10^{( - 8)}}cm

) is correct because it's the calculated radius of the sodium atom in a BCC lattice.

100 Medium

100 of 238

Application +4 | -1

X- ray analysis shows that the unit cell length in

\mathrm{NaCl}

is 562.8 pm. Calculate the density you would expect on this basis,

{N_A} = 6.023\mathrm{x}{10^{23}}\mathrm{mo}{\mathrm{l}^{ - 1}}

View answer and explanation

Correct option: B

2.179\,g\,c{m^{ - 3}}

Option B (

2.179\,g\,c{m^{ - 3}}

) is correct because it's the calculated density based on the given unit cell length.

101 Easy

101 of 238

Remembering +4 | -1

A match box exhibits :

View answer and explanation

Correct option: C

Orthorhombic geometry

Option C is correct because a matchbox has three unequal sides (length, width, and height) and all angles are 90 degrees, which corresponds to orthorhombic geometry.

102 Easy

102 of 238

Application +4 | -1

The distance between an octahedral and tetrahedral void in fcc lattice would be :-

View answer and explanation

Correct option: D

\frac{\sqrt{3} a}{4}

Option D (

\frac{{\sqrt 3 a}}{4}

) is correct because it represents half the distance between the body center (octahedral void) and a corner (tetrahedral void) in an FCC lattice.

103 Easy

103 of 238

Remembering +4 | -1

Schottky defect is observed in the crystal of

View answer and explanation

Correct option: A

NaCl

Option A (

NaCl

) is correct because Schottky defects are commonly observed in highly ionic compounds with a small difference in cation and anion size.

104 Hard

104 of 238

Understanding +4 | -1

If the radius of an octahedral void and that of atom in close packing is

{r} \,\&\,{R}

respectively then relation between

{r} \,\&\, {R}

is:

View answer and explanation

Correct option: C

{r}=0.414 {R}

Option C is correct because the relationship between the radius of an octahedral void (r) and the radius of the atom in close packing (R) is given by r = 0.414R.

105 Medium

105 of 238

Remembering +4 | -1

The closest distance between the centres of two molecules of a gas taking part in collision is called

View answer and explanation

Correct option: C

Both (1) and (2)

Option C (Both (1) and (2)) is correct because both "Effective molecular diameter" and "Collision diameter" refer to the closest distance between the centers of two colliding gas molecules.

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106 Medium

106 of 238

Analyzing +4 | -1

Statement I: Frenkel defect involving the migration of ions to interstitial sites is more likely for covalent compounds and for large (and highly polarisable) anions.

Statement II: Large polarisable anions make it easier to accommodate the displaced cations and minimise repulsive effect.

View answer and explanation

Correct option: A

Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I

Option A is correct because Frenkel defects are more likely in covalent compounds with large, polarizable anions, as these conditions facilitate cation displacement and minimize repulsion.

107 Medium

107 of 238

Analyzing +4 | -1

Oxygen atom forms FCC unit cell with 'A' atoms occupying all tetrahedral voids and 'B' atoms occupying all octahedral voids. If atoms are removed from two of the body diagonals then determine the formula of resultant compound formed.

View answer and explanation

Correct option: B

\mathrm{A}_8 \mathrm{B}_6 \mathrm{O}_7

Option B (

\mathrm{A}_8 \mathrm{B}_6 \mathrm{O}_7

) is correct because after removing atoms from the body diagonals, the remaining ratio of A, B, and O atoms corresponds to this formula.

108 Medium

108 of 238

Remembering +4 | -1

This one is amorphous –

View answer and explanation

Correct option: B

fused quartz

Option B (fused quartz) is correct because fused quartz is an amorphous form of silicon dioxide, lacking long-range order.

109 Easy

109 of 238

Application +4 | -1

The fraction of total volume occupies by the atoms present in a simple cube is :

View answer and explanation

Correct option: D

\frac{\pi }{6}

Option D (

\frac{\pi }{6}

) is correct because the packing fraction for a simple cubic cell is calculated as the volume occupied by the atoms divided by the total volume of the unit cell, which simplifies to

\frac{\pi }{6}

110 Medium

110 of 238

Remembering +4 | -1

Structure similar to zinc blende is found in

View answer and explanation

Correct option: C

\mathrm{CuCl}

Option C (

\mathrm{CuCl}

) is correct because CuCl has a zinc blende (ZnS) structure.

111 Easy

111 of 238

Remembering +4 | -1

Amorphous solids:

View answer and explanation

Correct option: C

Do not undergo clean cleavage when cut with knife

Option C (Do not undergo clean cleavage when cut with knife) is correct because amorphous solids lack long-range order, resulting in irregular fracture patterns when cut.

112 Easy

112 of 238

Remembering +4 | -1

Iodine crystals are :

View answer and explanation

Correct option: C

Molecular solid

Option C is correct because iodine crystals are formed by weak van der Waals forces between

I_2

molecules, making them molecular solids.

113 Easy

113 of 238

Understanding +4 | -1

In which of the following crystals alternate tetrahedral voids are occupied?

View answer and explanation

Correct option: B

\mathrm{Zns}

Option B (

\mathrm{Zns}

) is correct because in ZnS, sulfide ions form a face-centered cubic lattice, and zinc ions occupy alternate tetrahedral voids.

114 Medium

114 of 238

Remembering +4 | -1

Which of the following is an example of ferrimagnetic substance?

View answer and explanation

Correct option: D

F{e_3}{O_4}

Option D (

F{e_3}{O_4}

) is correct because it is a well-known example of a ferrimagnetic material due to its unequal alignment of magnetic moments.

115 Easy

115 of 238

Understanding +4 | -1

The parameters of the unit cell of a substance are

a = 2.5,b = 3.0,c = 4.0,\alpha = {90^0},\beta = {120^0},\gamma = {80^0}

. The crystal system of the substance is :

View answer and explanation

Correct option: D

Triclinic

Option D (Triclinic) is correct because the triclinic crystal system has unequal axes (

a \neq b \neq c

) and unequal angles (

\alpha \neq \beta \neq \gamma \neq 90^0

116 Hard

116 of 238

Application +4 | -1

An fcc lattice has a lattice parameter

a

= 400 pm. Calculate the molar volume of the lattice including all the empty space

View answer and explanation

Correct option: D

9.6\,\,mL

Option D (

9.6\,\,mL

) is correct because it's the calculated molar volume of the FCC lattice.

117 Medium

117 of 238

Remembering +4 | -1

Which of the following is ferroelectric compound?

View answer and explanation

Correct option: A

\mathrm{BaTi}{\mathrm{O}_3}

Option A (

\mathrm{BaTi}{\mathrm{O}_3}

) is correct because Barium Titanate is a well-known ferroelectric material, exhibiting spontaneous electric polarization.

118 Medium

118 of 238

Analyzing +4 | -1

Distance between nearest cation and anion in an ionic solid is

\frac{\sqrt{3} a}{4}

then ionic solid may be:

View answer and explanation

Correct option: D

All

Option D (All) is correct because the given distance between the nearest cation and anion corresponds to the tetrahedral void, which can be found in all the mentioned structures.

119 Easy

119 of 238

Analyzing +4 | -1

A mineral having the formula

\mathrm{AB}_2

crystallizes in ccp lattice with

\mathrm{A}

atoms occupying the lattice points. Pick out the correct statements of the following

View answer and explanation

Correct option: A

100 \%

occupancy of tetrahedral voids, C.N. of

\mathrm{B}=4

Option A is correct because in a ccp lattice, A atoms occupy the lattice points, and with the formula

AB_2

, B must occupy all the tetrahedral voids. The coordination number of an atom in a tetrahedral void is 4.

120 Medium

120 of 238

Understanding +4 | -1

The number of spheres contained (i) in one body centred cubic unit cell and (ii) in one face centred cubic unit cell, is

View answer and explanation

Correct option: A

In (i) 2 and in (ii) 4

Option A (In (i) 2 and in (ii) 4) is correct because a body-centered cubic unit cell contains 2 spheres, and a face-centered cubic unit cell contains 4 spheres.

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