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CHXII08:THE D- & F-BLOCK ELEMENTS

321224 Assertion :
Mohr salt is used as a primary standard in volumetric analysis.
Reason :
Mohr salt contains both ${Fe}^{2 +}$ and ${Fe}^{3 +}$ ions in the crystalline salt.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Mohr salt ${({NH}_{4})}_{2} Fe {({SO}_{4})}_{2} \cdot 6 H_{2} O$ contains only ${Fe}^{2 +}$ ions without any trace of ${Fe}^{3 +}$ ions. Thus, a standard solution of ${Fe}^{2 +}$ ions can be obtained directly by weighing a known amount of the Mohr salt. So option (3) is correct.

CHXII08:THE D- & F-BLOCK ELEMENTS

321225 Which of the following is magnetite?

1

{Fe}_{2} {CO}_{3}

2

{Fe}_{2} O_{3}

3

{Fe}_{3} O_{4}

4

{Fe}_{2} O_{3} \cdot 3 H_{2} O

Explanation:

${Fe}_{3} O_{4}$ (lodestone or magnetic oxide of iron) is called magnetite. It is a mixed oxide and, thus known as ferrosoferric oxide.

CHXII08:THE D- & F-BLOCK ELEMENTS

321226 The number of water molecules in Mohr's salt is

1 2

2 4

3 6

4 8

Explanation:

Formula for Mohr's salt is
$[{({NH}_{4})}_{2} Fe {({SO}_{4})}_{2} \cdot 6 H_{2} O]$ .

AIIMS - 2013

CHXII08:THE D- & F-BLOCK ELEMENTS

321227 Which of the following is a highly corrosive salt?

1

{FeCl}_{2}

2

{PbCl}_{2}

3

{Hg}_{2} {Cl}_{2}

4

{HgCl}_{2}

Explanation:

Mercuric chloride $({HgCl}_{2})$ is also known as corrosive sublimate as it is highly poisonous and corrosive. It is used ( $9 %$ solution) for sterlisation of surgical instruments, washing hands, preservative for wood. It is antidote for white of an egg. It is commercially prepared as follows
$H g S O_{4} + 2 N a C l \to H g C l_{2} + N a_{2} S O_{4}$

CHXII08:THE D- & F-BLOCK ELEMENTS

321224 Assertion :
Mohr salt is used as a primary standard in volumetric analysis.
Reason :
Mohr salt contains both ${Fe}^{2 +}$ and ${Fe}^{3 +}$ ions in the crystalline salt.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Mohr salt ${({NH}_{4})}_{2} Fe {({SO}_{4})}_{2} \cdot 6 H_{2} O$ contains only ${Fe}^{2 +}$ ions without any trace of ${Fe}^{3 +}$ ions. Thus, a standard solution of ${Fe}^{2 +}$ ions can be obtained directly by weighing a known amount of the Mohr salt. So option (3) is correct.

CHXII08:THE D- & F-BLOCK ELEMENTS

321225 Which of the following is magnetite?

1

{Fe}_{2} {CO}_{3}

2

{Fe}_{2} O_{3}

3

{Fe}_{3} O_{4}

4

{Fe}_{2} O_{3} \cdot 3 H_{2} O

Explanation:

${Fe}_{3} O_{4}$ (lodestone or magnetic oxide of iron) is called magnetite. It is a mixed oxide and, thus known as ferrosoferric oxide.

CHXII08:THE D- & F-BLOCK ELEMENTS

321226 The number of water molecules in Mohr's salt is

1 2

2 4

3 6

4 8

Explanation:

Formula for Mohr's salt is
$[{({NH}_{4})}_{2} Fe {({SO}_{4})}_{2} \cdot 6 H_{2} O]$ .

AIIMS - 2013

CHXII08:THE D- & F-BLOCK ELEMENTS

321227 Which of the following is a highly corrosive salt?

1

{FeCl}_{2}

2

{PbCl}_{2}

3

{Hg}_{2} {Cl}_{2}

4

{HgCl}_{2}

Explanation:

Mercuric chloride $({HgCl}_{2})$ is also known as corrosive sublimate as it is highly poisonous and corrosive. It is used ( $9 %$ solution) for sterlisation of surgical instruments, washing hands, preservative for wood. It is antidote for white of an egg. It is commercially prepared as follows
$H g S O_{4} + 2 N a C l \to H g C l_{2} + N a_{2} S O_{4}$

CHXII08:THE D- & F-BLOCK ELEMENTS

321224 Assertion :
Mohr salt is used as a primary standard in volumetric analysis.
Reason :
Mohr salt contains both ${Fe}^{2 +}$ and ${Fe}^{3 +}$ ions in the crystalline salt.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Mohr salt ${({NH}_{4})}_{2} Fe {({SO}_{4})}_{2} \cdot 6 H_{2} O$ contains only ${Fe}^{2 +}$ ions without any trace of ${Fe}^{3 +}$ ions. Thus, a standard solution of ${Fe}^{2 +}$ ions can be obtained directly by weighing a known amount of the Mohr salt. So option (3) is correct.

CHXII08:THE D- & F-BLOCK ELEMENTS

321225 Which of the following is magnetite?

1

{Fe}_{2} {CO}_{3}

2

{Fe}_{2} O_{3}

3

{Fe}_{3} O_{4}

4

{Fe}_{2} O_{3} \cdot 3 H_{2} O

Explanation:

${Fe}_{3} O_{4}$ (lodestone or magnetic oxide of iron) is called magnetite. It is a mixed oxide and, thus known as ferrosoferric oxide.

CHXII08:THE D- & F-BLOCK ELEMENTS

321226 The number of water molecules in Mohr's salt is

1 2

2 4

3 6

4 8

Explanation:

Formula for Mohr's salt is
$[{({NH}_{4})}_{2} Fe {({SO}_{4})}_{2} \cdot 6 H_{2} O]$ .

AIIMS - 2013

CHXII08:THE D- & F-BLOCK ELEMENTS

321227 Which of the following is a highly corrosive salt?

1

{FeCl}_{2}

2

{PbCl}_{2}

3

{Hg}_{2} {Cl}_{2}

4

{HgCl}_{2}

Explanation:

Mercuric chloride $({HgCl}_{2})$ is also known as corrosive sublimate as it is highly poisonous and corrosive. It is used ( $9 %$ solution) for sterlisation of surgical instruments, washing hands, preservative for wood. It is antidote for white of an egg. It is commercially prepared as follows
$H g S O_{4} + 2 N a C l \to H g C l_{2} + N a_{2} S O_{4}$

CHXII08:THE D- & F-BLOCK ELEMENTS

321224 Assertion :
Mohr salt is used as a primary standard in volumetric analysis.
Reason :
Mohr salt contains both ${Fe}^{2 +}$ and ${Fe}^{3 +}$ ions in the crystalline salt.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Mohr salt ${({NH}_{4})}_{2} Fe {({SO}_{4})}_{2} \cdot 6 H_{2} O$ contains only ${Fe}^{2 +}$ ions without any trace of ${Fe}^{3 +}$ ions. Thus, a standard solution of ${Fe}^{2 +}$ ions can be obtained directly by weighing a known amount of the Mohr salt. So option (3) is correct.

CHXII08:THE D- & F-BLOCK ELEMENTS

321225 Which of the following is magnetite?

1

{Fe}_{2} {CO}_{3}

2

{Fe}_{2} O_{3}

3

{Fe}_{3} O_{4}

4

{Fe}_{2} O_{3} \cdot 3 H_{2} O

Explanation:

${Fe}_{3} O_{4}$ (lodestone or magnetic oxide of iron) is called magnetite. It is a mixed oxide and, thus known as ferrosoferric oxide.

CHXII08:THE D- & F-BLOCK ELEMENTS

321226 The number of water molecules in Mohr's salt is

1 2

2 4

3 6

4 8

Explanation:

Formula for Mohr's salt is
$[{({NH}_{4})}_{2} Fe {({SO}_{4})}_{2} \cdot 6 H_{2} O]$ .

AIIMS - 2013

CHXII08:THE D- & F-BLOCK ELEMENTS

321227 Which of the following is a highly corrosive salt?

1

{FeCl}_{2}

2

{PbCl}_{2}

3

{Hg}_{2} {Cl}_{2}

4

{HgCl}_{2}

Explanation:

Mercuric chloride $({HgCl}_{2})$ is also known as corrosive sublimate as it is highly poisonous and corrosive. It is used ( $9 %$ solution) for sterlisation of surgical instruments, washing hands, preservative for wood. It is antidote for white of an egg. It is commercially prepared as follows
$H g S O_{4} + 2 N a C l \to H g C l_{2} + N a_{2} S O_{4}$

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