QBManager

CHXII01:THE SOLID STATE

318815 1 mole of $NaCl$ is doped with $10^{- 5}$ mole of ${SrCl}_{2}$ . The number of cationic vacancies in the crystal lattice will be

1

6.022 \times 10^{18}

2

6.022 \times 10^{15}

3

6.022 \times 10^{23}

4

12.044 \times 10^{20}

Explanation:

1 mole of $NaCl$ is doped with $10^{- 5}$ mole of ${SrCl}_{2}$
As each ${Sr}^{2 +}$ ion introduces one cationic vacancy, therefore, number of cationic vacancies
$\begin{aligned} = 10^{- 5} \times 6.02 \times 10^{23} {mol}^{- 1} \\ = 6.02 \times 10^{18} {mol}^{- 1} \end{aligned}$

CHXII01:THE SOLID STATE

318816 The false statement among the following is

1

CsCl

crystal shows Schottky defect.

2 Crystals having F-centres are paramagnetic.

3 Photosensitivity of

AgBr

is due to the presence of Frenkel defect in its crystals.

4 If

NaCl

is doped with

10^{- 3} mol % {SrCl}_{2}

then the concentration of cation vacancies will be

10^{- 2} mol %

Explanation:

$As$ each ${Sr}^{2 +}$ ion introduces one cation vacancy, therefore, concentration of cation vacancies $= mol %$ of ${SrCl}_{2}$ added $= 10^{- 3} mol %$

CHXII01:THE SOLID STATE

318817 Consider the following statements.
I. Impurity defects arise when foreign atoms are present at the lattice site in place of host atoms or at the vacant interstitial sites.
II. Addition of impurities alters the properties of the crystal.
III. Doping is the process of adding impurities to a crystalline substance so as to change its properties.
Which of the above statement(s) is/are?

1 I and II

2 II and III

3 I and III

4 I, II and III

CHXII01:THE SOLID STATE

318818 If $NaCl$ is doped with $10^{- 3} mol % {SrCl}_{2}$ , then the concentration of cation vacancies will be

1

1 \times 10^{- 3} mol %

2

2 \times 10^{- 3} mol %

3

3 \times 10^{- 3} mol %

4

4 \times 10^{- 3} mol %

Explanation:

As each ${Sr}^{2 +}$ ion introduces one cation vacancy, therefore concentration of cation vacancies $= mol %$ of ${SrCl}_{2}$ added.

CHXII01:THE SOLID STATE

318819 In the laboratory, sodium chloride is made by burning sodium in the atmosphere of chlorine. The salt obtained is yellow in colour. The cause of yellow colour is

1 Presence of

{Na}^{+}

ions in the crystal lattice

2 Presence of

{Cl}^{-}

ions in the crystal lattice

3 Presence of electrons in the crystal lattice

4 Presence of face centred cubic crystal lattice.

Explanation:

Yellow colour on heating $NaCl$ in presence of $Na$ is due to presence of electrons in anion vacancies (F-centres).

CHXII01:THE SOLID STATE

318815 1 mole of $NaCl$ is doped with $10^{- 5}$ mole of ${SrCl}_{2}$ . The number of cationic vacancies in the crystal lattice will be

1

6.022 \times 10^{18}

2

6.022 \times 10^{15}

3

6.022 \times 10^{23}

4

12.044 \times 10^{20}

Explanation:

1 mole of $NaCl$ is doped with $10^{- 5}$ mole of ${SrCl}_{2}$
As each ${Sr}^{2 +}$ ion introduces one cationic vacancy, therefore, number of cationic vacancies
$\begin{aligned} = 10^{- 5} \times 6.02 \times 10^{23} {mol}^{- 1} \\ = 6.02 \times 10^{18} {mol}^{- 1} \end{aligned}$

CHXII01:THE SOLID STATE

318816 The false statement among the following is

1

CsCl

crystal shows Schottky defect.

2 Crystals having F-centres are paramagnetic.

3 Photosensitivity of

AgBr

is due to the presence of Frenkel defect in its crystals.

4 If

NaCl

is doped with

10^{- 3} mol % {SrCl}_{2}

then the concentration of cation vacancies will be

10^{- 2} mol %

Explanation:

$As$ each ${Sr}^{2 +}$ ion introduces one cation vacancy, therefore, concentration of cation vacancies $= mol %$ of ${SrCl}_{2}$ added $= 10^{- 3} mol %$

CHXII01:THE SOLID STATE

318817 Consider the following statements.
I. Impurity defects arise when foreign atoms are present at the lattice site in place of host atoms or at the vacant interstitial sites.
II. Addition of impurities alters the properties of the crystal.
III. Doping is the process of adding impurities to a crystalline substance so as to change its properties.
Which of the above statement(s) is/are?

1 I and II

2 II and III

3 I and III

4 I, II and III

CHXII01:THE SOLID STATE

318818 If $NaCl$ is doped with $10^{- 3} mol % {SrCl}_{2}$ , then the concentration of cation vacancies will be

1

1 \times 10^{- 3} mol %

2

2 \times 10^{- 3} mol %

3

3 \times 10^{- 3} mol %

4

4 \times 10^{- 3} mol %

Explanation:

As each ${Sr}^{2 +}$ ion introduces one cation vacancy, therefore concentration of cation vacancies $= mol %$ of ${SrCl}_{2}$ added.

CHXII01:THE SOLID STATE

318819 In the laboratory, sodium chloride is made by burning sodium in the atmosphere of chlorine. The salt obtained is yellow in colour. The cause of yellow colour is

1 Presence of

{Na}^{+}

ions in the crystal lattice

2 Presence of

{Cl}^{-}

ions in the crystal lattice

3 Presence of electrons in the crystal lattice

4 Presence of face centred cubic crystal lattice.

Explanation:

Yellow colour on heating $NaCl$ in presence of $Na$ is due to presence of electrons in anion vacancies (F-centres).

CHXII01:THE SOLID STATE

318815 1 mole of $NaCl$ is doped with $10^{- 5}$ mole of ${SrCl}_{2}$ . The number of cationic vacancies in the crystal lattice will be

1

6.022 \times 10^{18}

2

6.022 \times 10^{15}

3

6.022 \times 10^{23}

4

12.044 \times 10^{20}

Explanation:

1 mole of $NaCl$ is doped with $10^{- 5}$ mole of ${SrCl}_{2}$
As each ${Sr}^{2 +}$ ion introduces one cationic vacancy, therefore, number of cationic vacancies
$\begin{aligned} = 10^{- 5} \times 6.02 \times 10^{23} {mol}^{- 1} \\ = 6.02 \times 10^{18} {mol}^{- 1} \end{aligned}$

CHXII01:THE SOLID STATE

318816 The false statement among the following is

1

CsCl

crystal shows Schottky defect.

2 Crystals having F-centres are paramagnetic.

3 Photosensitivity of

AgBr

is due to the presence of Frenkel defect in its crystals.

4 If

NaCl

is doped with

10^{- 3} mol % {SrCl}_{2}

then the concentration of cation vacancies will be

10^{- 2} mol %

Explanation:

$As$ each ${Sr}^{2 +}$ ion introduces one cation vacancy, therefore, concentration of cation vacancies $= mol %$ of ${SrCl}_{2}$ added $= 10^{- 3} mol %$

CHXII01:THE SOLID STATE

318817 Consider the following statements.
I. Impurity defects arise when foreign atoms are present at the lattice site in place of host atoms or at the vacant interstitial sites.
II. Addition of impurities alters the properties of the crystal.
III. Doping is the process of adding impurities to a crystalline substance so as to change its properties.
Which of the above statement(s) is/are?

1 I and II

2 II and III

3 I and III

4 I, II and III

CHXII01:THE SOLID STATE

318818 If $NaCl$ is doped with $10^{- 3} mol % {SrCl}_{2}$ , then the concentration of cation vacancies will be

1

1 \times 10^{- 3} mol %

2

2 \times 10^{- 3} mol %

3

3 \times 10^{- 3} mol %

4

4 \times 10^{- 3} mol %

Explanation:

As each ${Sr}^{2 +}$ ion introduces one cation vacancy, therefore concentration of cation vacancies $= mol %$ of ${SrCl}_{2}$ added.

CHXII01:THE SOLID STATE

318819 In the laboratory, sodium chloride is made by burning sodium in the atmosphere of chlorine. The salt obtained is yellow in colour. The cause of yellow colour is

1 Presence of

{Na}^{+}

ions in the crystal lattice

2 Presence of

{Cl}^{-}

ions in the crystal lattice

3 Presence of electrons in the crystal lattice

4 Presence of face centred cubic crystal lattice.

Explanation:

Yellow colour on heating $NaCl$ in presence of $Na$ is due to presence of electrons in anion vacancies (F-centres).

CHXII01:THE SOLID STATE

318815 1 mole of $NaCl$ is doped with $10^{- 5}$ mole of ${SrCl}_{2}$ . The number of cationic vacancies in the crystal lattice will be

1

6.022 \times 10^{18}

2

6.022 \times 10^{15}

3

6.022 \times 10^{23}

4

12.044 \times 10^{20}

Explanation:

1 mole of $NaCl$ is doped with $10^{- 5}$ mole of ${SrCl}_{2}$
As each ${Sr}^{2 +}$ ion introduces one cationic vacancy, therefore, number of cationic vacancies
$\begin{aligned} = 10^{- 5} \times 6.02 \times 10^{23} {mol}^{- 1} \\ = 6.02 \times 10^{18} {mol}^{- 1} \end{aligned}$

CHXII01:THE SOLID STATE

318816 The false statement among the following is

1

CsCl

crystal shows Schottky defect.

2 Crystals having F-centres are paramagnetic.

3 Photosensitivity of

AgBr

is due to the presence of Frenkel defect in its crystals.

4 If

NaCl

is doped with

10^{- 3} mol % {SrCl}_{2}

then the concentration of cation vacancies will be

10^{- 2} mol %

Explanation:

$As$ each ${Sr}^{2 +}$ ion introduces one cation vacancy, therefore, concentration of cation vacancies $= mol %$ of ${SrCl}_{2}$ added $= 10^{- 3} mol %$

CHXII01:THE SOLID STATE

318817 Consider the following statements.
I. Impurity defects arise when foreign atoms are present at the lattice site in place of host atoms or at the vacant interstitial sites.
II. Addition of impurities alters the properties of the crystal.
III. Doping is the process of adding impurities to a crystalline substance so as to change its properties.
Which of the above statement(s) is/are?

1 I and II

2 II and III

3 I and III

4 I, II and III

CHXII01:THE SOLID STATE

318818 If $NaCl$ is doped with $10^{- 3} mol % {SrCl}_{2}$ , then the concentration of cation vacancies will be

1

1 \times 10^{- 3} mol %

2

2 \times 10^{- 3} mol %

3

3 \times 10^{- 3} mol %

4

4 \times 10^{- 3} mol %

Explanation:

As each ${Sr}^{2 +}$ ion introduces one cation vacancy, therefore concentration of cation vacancies $= mol %$ of ${SrCl}_{2}$ added.

CHXII01:THE SOLID STATE

318819 In the laboratory, sodium chloride is made by burning sodium in the atmosphere of chlorine. The salt obtained is yellow in colour. The cause of yellow colour is

1 Presence of

{Na}^{+}

ions in the crystal lattice

2 Presence of

{Cl}^{-}

ions in the crystal lattice

3 Presence of electrons in the crystal lattice

4 Presence of face centred cubic crystal lattice.

Explanation:

Yellow colour on heating $NaCl$ in presence of $Na$ is due to presence of electrons in anion vacancies (F-centres).

CHXII01:THE SOLID STATE

318815 1 mole of $NaCl$ is doped with $10^{- 5}$ mole of ${SrCl}_{2}$ . The number of cationic vacancies in the crystal lattice will be

1

6.022 \times 10^{18}

2

6.022 \times 10^{15}

3

6.022 \times 10^{23}

4

12.044 \times 10^{20}

Explanation:

1 mole of $NaCl$ is doped with $10^{- 5}$ mole of ${SrCl}_{2}$
As each ${Sr}^{2 +}$ ion introduces one cationic vacancy, therefore, number of cationic vacancies
$\begin{aligned} = 10^{- 5} \times 6.02 \times 10^{23} {mol}^{- 1} \\ = 6.02 \times 10^{18} {mol}^{- 1} \end{aligned}$

CHXII01:THE SOLID STATE

318816 The false statement among the following is

1

CsCl

crystal shows Schottky defect.

2 Crystals having F-centres are paramagnetic.

3 Photosensitivity of

AgBr

is due to the presence of Frenkel defect in its crystals.

4 If

NaCl

is doped with

10^{- 3} mol % {SrCl}_{2}

then the concentration of cation vacancies will be

10^{- 2} mol %

Explanation:

$As$ each ${Sr}^{2 +}$ ion introduces one cation vacancy, therefore, concentration of cation vacancies $= mol %$ of ${SrCl}_{2}$ added $= 10^{- 3} mol %$

CHXII01:THE SOLID STATE

318817 Consider the following statements.
I. Impurity defects arise when foreign atoms are present at the lattice site in place of host atoms or at the vacant interstitial sites.
II. Addition of impurities alters the properties of the crystal.
III. Doping is the process of adding impurities to a crystalline substance so as to change its properties.
Which of the above statement(s) is/are?

1 I and II

2 II and III

3 I and III

4 I, II and III

CHXII01:THE SOLID STATE

318818 If $NaCl$ is doped with $10^{- 3} mol % {SrCl}_{2}$ , then the concentration of cation vacancies will be

1

1 \times 10^{- 3} mol %

2

2 \times 10^{- 3} mol %

3

3 \times 10^{- 3} mol %

4

4 \times 10^{- 3} mol %

Explanation:

As each ${Sr}^{2 +}$ ion introduces one cation vacancy, therefore concentration of cation vacancies $= mol %$ of ${SrCl}_{2}$ added.

CHXII01:THE SOLID STATE

318819 In the laboratory, sodium chloride is made by burning sodium in the atmosphere of chlorine. The salt obtained is yellow in colour. The cause of yellow colour is

1 Presence of

{Na}^{+}

ions in the crystal lattice

2 Presence of

{Cl}^{-}

ions in the crystal lattice

3 Presence of electrons in the crystal lattice

4 Presence of face centred cubic crystal lattice.

Explanation:

Yellow colour on heating $NaCl$ in presence of $Na$ is due to presence of electrons in anion vacancies (F-centres).