QBManager

The Solid State

31898 The correct statement in the following is

1 The ionic crystal of

A g B r

has Schottky defect

2 The unit cell having crystal parameters,

a = b \neq c,

α = β = 90^{o}, γ = 120^{o}

is hexagonal

3 In ionic compounds having Frenkel defect the ratio

\frac{γ_{+}}{γ_{-}}

is high

4 The coordination number of

N a^{+}

ion in

N a C l

is

4

Explanation:

(b) A crystal system is hexagonal if its unit cell having $a = b \neq c$ axial ratio and $α = β = 90^{o},$ $γ = 120^{o}$ axial angles.

The Solid State

31899 Which of the following is correctCrystal system
Axial distance
Axial angles
example

1 Cubic

a \neq b = c

α = β \neq γ = 90^{\circ}

C u, K C l

2 Monoclinic

a \neq b = c

α = β = γ = 90^{\circ}

P b C r O_{2}, P b C r O_{4}

3 Rhombohedral

a = b = c

α β

=

γ \neq 90^{\circ}

C a C O_{3}, H g S

4 Triclinic

a = b = c

α \neq β

=

γ \neq 90^{o}

K_{2} C r_{2} O_{7}, C u S O_{4} . 5 H_{2} O

Explanation:

(c) Rhombohedral crystal system
$a = b = c$ , $α = β = γ \neq 90^{o}$
ex - $N a N O_{3}, C a S O_{4}$ , calcite $C a C O_{3}$ , $H g S$

The Solid State

31900 Tetragonal crystal system has the following unit cell dimensions

1

a = b = c

and

α = β = γ = 90^{o}

2

a = b \neq c

and

α = β = γ = 90^{o}

3

a \neq b \neq c

and

α = β = γ = 90^{o}

4

a = b \neq c

and

α = β = 90^{o}, γ = 120^{o}

Explanation:

(b)Tetragonal system has the unit cell dimension $a = b \neq c, α = β = γ = 90^{\circ}$ .

The Solid State

31901 Rhombic sulphur has the following structure

1 Open chain

2 Tetrahedral

3 Puckered

6 -

membered ring

4 Puckered

8 -

membered ring

Explanation:

The structure of rhombic sulphur is definitely molecular. The $S 8$ molecule is a puckered $8$ atom ring, with an $S - S$ distance of $2.12 A$

The Solid State

31898 The correct statement in the following is

1 The ionic crystal of

A g B r

has Schottky defect

2 The unit cell having crystal parameters,

a = b \neq c,

α = β = 90^{o}, γ = 120^{o}

is hexagonal

3 In ionic compounds having Frenkel defect the ratio

\frac{γ_{+}}{γ_{-}}

is high

4 The coordination number of

N a^{+}

ion in

N a C l

is

4

Explanation:

(b) A crystal system is hexagonal if its unit cell having $a = b \neq c$ axial ratio and $α = β = 90^{o},$ $γ = 120^{o}$ axial angles.

The Solid State

31899 Which of the following is correctCrystal system
Axial distance
Axial angles
example

1 Cubic

a \neq b = c

α = β \neq γ = 90^{\circ}

C u, K C l

2 Monoclinic

a \neq b = c

α = β = γ = 90^{\circ}

P b C r O_{2}, P b C r O_{4}

3 Rhombohedral

a = b = c

α β

=

γ \neq 90^{\circ}

C a C O_{3}, H g S

4 Triclinic

a = b = c

α \neq β

=

γ \neq 90^{o}

K_{2} C r_{2} O_{7}, C u S O_{4} . 5 H_{2} O

Explanation:

(c) Rhombohedral crystal system
$a = b = c$ , $α = β = γ \neq 90^{o}$
ex - $N a N O_{3}, C a S O_{4}$ , calcite $C a C O_{3}$ , $H g S$

The Solid State

31900 Tetragonal crystal system has the following unit cell dimensions

1

a = b = c

and

α = β = γ = 90^{o}

2

a = b \neq c

and

α = β = γ = 90^{o}

3

a \neq b \neq c

and

α = β = γ = 90^{o}

4

a = b \neq c

and

α = β = 90^{o}, γ = 120^{o}

Explanation:

(b)Tetragonal system has the unit cell dimension $a = b \neq c, α = β = γ = 90^{\circ}$ .

The Solid State

31901 Rhombic sulphur has the following structure

1 Open chain

2 Tetrahedral

3 Puckered

6 -

membered ring

4 Puckered

8 -

membered ring

Explanation:

The structure of rhombic sulphur is definitely molecular. The $S 8$ molecule is a puckered $8$ atom ring, with an $S - S$ distance of $2.12 A$

The Solid State

31898 The correct statement in the following is

1 The ionic crystal of

A g B r

has Schottky defect

2 The unit cell having crystal parameters,

a = b \neq c,

α = β = 90^{o}, γ = 120^{o}

is hexagonal

3 In ionic compounds having Frenkel defect the ratio

\frac{γ_{+}}{γ_{-}}

is high

4 The coordination number of

N a^{+}

ion in

N a C l

is

4

Explanation:

(b) A crystal system is hexagonal if its unit cell having $a = b \neq c$ axial ratio and $α = β = 90^{o},$ $γ = 120^{o}$ axial angles.

The Solid State

31899 Which of the following is correctCrystal system
Axial distance
Axial angles
example

1 Cubic

a \neq b = c

α = β \neq γ = 90^{\circ}

C u, K C l

2 Monoclinic

a \neq b = c

α = β = γ = 90^{\circ}

P b C r O_{2}, P b C r O_{4}

3 Rhombohedral

a = b = c

α β

=

γ \neq 90^{\circ}

C a C O_{3}, H g S

4 Triclinic

a = b = c

α \neq β

=

γ \neq 90^{o}

K_{2} C r_{2} O_{7}, C u S O_{4} . 5 H_{2} O

Explanation:

(c) Rhombohedral crystal system
$a = b = c$ , $α = β = γ \neq 90^{o}$
ex - $N a N O_{3}, C a S O_{4}$ , calcite $C a C O_{3}$ , $H g S$

The Solid State

31900 Tetragonal crystal system has the following unit cell dimensions

1

a = b = c

and

α = β = γ = 90^{o}

2

a = b \neq c

and

α = β = γ = 90^{o}

3

a \neq b \neq c

and

α = β = γ = 90^{o}

4

a = b \neq c

and

α = β = 90^{o}, γ = 120^{o}

Explanation:

(b)Tetragonal system has the unit cell dimension $a = b \neq c, α = β = γ = 90^{\circ}$ .

The Solid State

31901 Rhombic sulphur has the following structure

1 Open chain

2 Tetrahedral

3 Puckered

6 -

membered ring

4 Puckered

8 -

membered ring

Explanation:

The structure of rhombic sulphur is definitely molecular. The $S 8$ molecule is a puckered $8$ atom ring, with an $S - S$ distance of $2.12 A$

The Solid State

31898 The correct statement in the following is

1 The ionic crystal of

A g B r

has Schottky defect

2 The unit cell having crystal parameters,

a = b \neq c,

α = β = 90^{o}, γ = 120^{o}

is hexagonal

3 In ionic compounds having Frenkel defect the ratio

\frac{γ_{+}}{γ_{-}}

is high

4 The coordination number of

N a^{+}

ion in

N a C l

is

4

Explanation:

(b) A crystal system is hexagonal if its unit cell having $a = b \neq c$ axial ratio and $α = β = 90^{o},$ $γ = 120^{o}$ axial angles.

The Solid State

31899 Which of the following is correctCrystal system
Axial distance
Axial angles
example

1 Cubic

a \neq b = c

α = β \neq γ = 90^{\circ}

C u, K C l

2 Monoclinic

a \neq b = c

α = β = γ = 90^{\circ}

P b C r O_{2}, P b C r O_{4}

3 Rhombohedral

a = b = c

α β

=

γ \neq 90^{\circ}

C a C O_{3}, H g S

4 Triclinic

a = b = c

α \neq β

=

γ \neq 90^{o}

K_{2} C r_{2} O_{7}, C u S O_{4} . 5 H_{2} O

Explanation:

(c) Rhombohedral crystal system
$a = b = c$ , $α = β = γ \neq 90^{o}$
ex - $N a N O_{3}, C a S O_{4}$ , calcite $C a C O_{3}$ , $H g S$

The Solid State

31900 Tetragonal crystal system has the following unit cell dimensions

1

a = b = c

and

α = β = γ = 90^{o}

2

a = b \neq c

and

α = β = γ = 90^{o}

3

a \neq b \neq c

and

α = β = γ = 90^{o}

4

a = b \neq c

and

α = β = 90^{o}, γ = 120^{o}

Explanation:

(b)Tetragonal system has the unit cell dimension $a = b \neq c, α = β = γ = 90^{\circ}$ .

The Solid State

31901 Rhombic sulphur has the following structure

1 Open chain

2 Tetrahedral

3 Puckered

6 -

membered ring

4 Puckered

8 -

membered ring

Explanation:

The structure of rhombic sulphur is definitely molecular. The $S 8$ molecule is a puckered $8$ atom ring, with an $S - S$ distance of $2.12 A$