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11. THE P-BLOCK ELEMENTS

189722 Which gas is used in excess water

1

C O_{2}

2

S O_{2}

3

C O

4 Water vapours

11. THE P-BLOCK ELEMENTS

189723 The compound which does not possess a peroxide linkage is

1

N a_{2} O_{2}

2

C r O_{5}

3

H_{2} S O_{5}

4

P b O_{2}

Explanation:

A peroxide is a compound containing an oxygen-oxygen single bond or the peroxide anion The $O - O$ group is called the peroxide group or peroxo group.
$P b O_{2}$ do not have peroxide linkage. Remaining all compounds have the $O - O$ (peroxide linkage).

11. THE P-BLOCK ELEMENTS

189724 Silicon is an important constituent of

1 Rocks

2 Amalgams

3 Chlorophyll

4 Haemoglobin

Explanation:

Silicon is an important constituent of rock in form of silica $S i O_{2}$ .
Amalgams contains $H g$ .
Haemoglobin contains iron.
Chlorophyll contains $M g$ .

11. THE P-BLOCK ELEMENTS

189725 Carborundum is

1

S i C

2

A l C l_{3}

3

A l_{2} (S O_{4})_{3}

4

A l_{2} O_{3} . 2 H_{2} O

Explanation:

Silicon carbide $(S i C)$ , also known as carborundum, is a semiconductor containing silicon and carbon. It occurs in nature as the extremely rare mineral moissanite.

11. THE P-BLOCK ELEMENTS

189728 Soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. White metallic tin buttons got converted to grey powder. This transformation is related to

1 A change in the partial pressure of oxygen in the air

2 A change in the crystalline structure of tin

3 An interaction with nitrogen of the air at very low to temperatures

4 An interaction with water vapour contained in the humid air

Explanation:

(b) Grey tin is very brittle and easily crumbles down to a powder in very cold climates.
$\underset{(C u b i c)}{G r e y t i n}$ $⇌$ $\underset{(T e t r a g o n a l)}{W h i t e t i n}$
The change of white tin to grey tin is accompanied by increase in volume. This is called tin disease or tin plague.

11. THE P-BLOCK ELEMENTS

189722 Which gas is used in excess water

1

C O_{2}

2

S O_{2}

3

C O

4 Water vapours

11. THE P-BLOCK ELEMENTS

189723 The compound which does not possess a peroxide linkage is

1

N a_{2} O_{2}

2

C r O_{5}

3

H_{2} S O_{5}

4

P b O_{2}

Explanation:

A peroxide is a compound containing an oxygen-oxygen single bond or the peroxide anion The $O - O$ group is called the peroxide group or peroxo group.
$P b O_{2}$ do not have peroxide linkage. Remaining all compounds have the $O - O$ (peroxide linkage).

11. THE P-BLOCK ELEMENTS

189724 Silicon is an important constituent of

1 Rocks

2 Amalgams

3 Chlorophyll

4 Haemoglobin

Explanation:

Silicon is an important constituent of rock in form of silica $S i O_{2}$ .
Amalgams contains $H g$ .
Haemoglobin contains iron.
Chlorophyll contains $M g$ .

11. THE P-BLOCK ELEMENTS

189725 Carborundum is

1

S i C

2

A l C l_{3}

3

A l_{2} (S O_{4})_{3}

4

A l_{2} O_{3} . 2 H_{2} O

Explanation:

Silicon carbide $(S i C)$ , also known as carborundum, is a semiconductor containing silicon and carbon. It occurs in nature as the extremely rare mineral moissanite.

11. THE P-BLOCK ELEMENTS

189728 Soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. White metallic tin buttons got converted to grey powder. This transformation is related to

1 A change in the partial pressure of oxygen in the air

2 A change in the crystalline structure of tin

3 An interaction with nitrogen of the air at very low to temperatures

4 An interaction with water vapour contained in the humid air

Explanation:

(b) Grey tin is very brittle and easily crumbles down to a powder in very cold climates.
$\underset{(C u b i c)}{G r e y t i n}$ $⇌$ $\underset{(T e t r a g o n a l)}{W h i t e t i n}$
The change of white tin to grey tin is accompanied by increase in volume. This is called tin disease or tin plague.

11. THE P-BLOCK ELEMENTS

189722 Which gas is used in excess water

1

C O_{2}

2

S O_{2}

3

C O

4 Water vapours

11. THE P-BLOCK ELEMENTS

189723 The compound which does not possess a peroxide linkage is

1

N a_{2} O_{2}

2

C r O_{5}

3

H_{2} S O_{5}

4

P b O_{2}

Explanation:

A peroxide is a compound containing an oxygen-oxygen single bond or the peroxide anion The $O - O$ group is called the peroxide group or peroxo group.
$P b O_{2}$ do not have peroxide linkage. Remaining all compounds have the $O - O$ (peroxide linkage).

11. THE P-BLOCK ELEMENTS

189724 Silicon is an important constituent of

1 Rocks

2 Amalgams

3 Chlorophyll

4 Haemoglobin

Explanation:

Silicon is an important constituent of rock in form of silica $S i O_{2}$ .
Amalgams contains $H g$ .
Haemoglobin contains iron.
Chlorophyll contains $M g$ .

11. THE P-BLOCK ELEMENTS

189725 Carborundum is

1

S i C

2

A l C l_{3}

3

A l_{2} (S O_{4})_{3}

4

A l_{2} O_{3} . 2 H_{2} O

Explanation:

Silicon carbide $(S i C)$ , also known as carborundum, is a semiconductor containing silicon and carbon. It occurs in nature as the extremely rare mineral moissanite.

11. THE P-BLOCK ELEMENTS

189728 Soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. White metallic tin buttons got converted to grey powder. This transformation is related to

1 A change in the partial pressure of oxygen in the air

2 A change in the crystalline structure of tin

3 An interaction with nitrogen of the air at very low to temperatures

4 An interaction with water vapour contained in the humid air

Explanation:

(b) Grey tin is very brittle and easily crumbles down to a powder in very cold climates.
$\underset{(C u b i c)}{G r e y t i n}$ $⇌$ $\underset{(T e t r a g o n a l)}{W h i t e t i n}$
The change of white tin to grey tin is accompanied by increase in volume. This is called tin disease or tin plague.

11. THE P-BLOCK ELEMENTS

189722 Which gas is used in excess water

1

C O_{2}

2

S O_{2}

3

C O

4 Water vapours

11. THE P-BLOCK ELEMENTS

189723 The compound which does not possess a peroxide linkage is

1

N a_{2} O_{2}

2

C r O_{5}

3

H_{2} S O_{5}

4

P b O_{2}

Explanation:

A peroxide is a compound containing an oxygen-oxygen single bond or the peroxide anion The $O - O$ group is called the peroxide group or peroxo group.
$P b O_{2}$ do not have peroxide linkage. Remaining all compounds have the $O - O$ (peroxide linkage).

11. THE P-BLOCK ELEMENTS

189724 Silicon is an important constituent of

1 Rocks

2 Amalgams

3 Chlorophyll

4 Haemoglobin

Explanation:

Silicon is an important constituent of rock in form of silica $S i O_{2}$ .
Amalgams contains $H g$ .
Haemoglobin contains iron.
Chlorophyll contains $M g$ .

11. THE P-BLOCK ELEMENTS

189725 Carborundum is

1

S i C

2

A l C l_{3}

3

A l_{2} (S O_{4})_{3}

4

A l_{2} O_{3} . 2 H_{2} O

Explanation:

Silicon carbide $(S i C)$ , also known as carborundum, is a semiconductor containing silicon and carbon. It occurs in nature as the extremely rare mineral moissanite.

11. THE P-BLOCK ELEMENTS

189728 Soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. White metallic tin buttons got converted to grey powder. This transformation is related to

1 A change in the partial pressure of oxygen in the air

2 A change in the crystalline structure of tin

3 An interaction with nitrogen of the air at very low to temperatures

4 An interaction with water vapour contained in the humid air

Explanation:

(b) Grey tin is very brittle and easily crumbles down to a powder in very cold climates.
$\underset{(C u b i c)}{G r e y t i n}$ $⇌$ $\underset{(T e t r a g o n a l)}{W h i t e t i n}$
The change of white tin to grey tin is accompanied by increase in volume. This is called tin disease or tin plague.

11. THE P-BLOCK ELEMENTS

189722 Which gas is used in excess water

1

C O_{2}

2

S O_{2}

3

C O

4 Water vapours

11. THE P-BLOCK ELEMENTS

189723 The compound which does not possess a peroxide linkage is

1

N a_{2} O_{2}

2

C r O_{5}

3

H_{2} S O_{5}

4

P b O_{2}

Explanation:

A peroxide is a compound containing an oxygen-oxygen single bond or the peroxide anion The $O - O$ group is called the peroxide group or peroxo group.
$P b O_{2}$ do not have peroxide linkage. Remaining all compounds have the $O - O$ (peroxide linkage).

11. THE P-BLOCK ELEMENTS

189724 Silicon is an important constituent of

1 Rocks

2 Amalgams

3 Chlorophyll

4 Haemoglobin

Explanation:

Silicon is an important constituent of rock in form of silica $S i O_{2}$ .
Amalgams contains $H g$ .
Haemoglobin contains iron.
Chlorophyll contains $M g$ .

11. THE P-BLOCK ELEMENTS

189725 Carborundum is

1

S i C

2

A l C l_{3}

3

A l_{2} (S O_{4})_{3}

4

A l_{2} O_{3} . 2 H_{2} O

Explanation:

Silicon carbide $(S i C)$ , also known as carborundum, is a semiconductor containing silicon and carbon. It occurs in nature as the extremely rare mineral moissanite.

11. THE P-BLOCK ELEMENTS

189728 Soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. White metallic tin buttons got converted to grey powder. This transformation is related to

1 A change in the partial pressure of oxygen in the air

2 A change in the crystalline structure of tin

3 An interaction with nitrogen of the air at very low to temperatures

4 An interaction with water vapour contained in the humid air

Explanation:

(b) Grey tin is very brittle and easily crumbles down to a powder in very cold climates.
$\underset{(C u b i c)}{G r e y t i n}$ $⇌$ $\underset{(T e t r a g o n a l)}{W h i t e t i n}$
The change of white tin to grey tin is accompanied by increase in volume. This is called tin disease or tin plague.

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