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GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS

25816 Corundum is

1

S r O_{2}

2

A l_{2} O_{3}

3

C a C l_{2}

4

C u_{2} C l_{2}

Explanation:

Corundum is best known for its gem varieties, Ruby and Sapphire. Corundum is a very hard, tough, and stable mineral.
Chemical formula of corundum is $A l_{2} O_{3}$

GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS

25817 Which is not a mineral of aluminium

1 Anhydrite

2 Bauxite

3 Corundum

4 Diaspore

Explanation:

Bauxite $(A l_{2} O_{3} .2 H_{2} O)$
Corundum $(A l_{2} O_{3})$
Diaspore $(A l_{2} O_{3} . H_{2} O)$

GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS

25818 Which of the following mineral does not contain $A l$

1 Cryolite

2 Mica

3 Feldspar

4 Fluorspar

Explanation:

Fluorspar $(C a F_{2})$ ,
Cryolite $(N a_{3} A l F_{6})$ ,
Feldspar $(K A l S i_{3} O_{8})$ ,
Mica $(K_{2} O .3 A l_{2} O_{3} .6 S i O_{2} .2 H_{2} O)$

GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS

25819 An important oxide ore of iron is

1 Haematite

2 Siderite

3 Pyrites

4 Malachite

Explanation:

(a)Haematite $F e_{2} O_{3}$

GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS

25820 Which ore is used for the manufacture of iron

1 Cryolite

2 Bauxite

3 Haematite

4 Chalcopyrites

GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS

25816 Corundum is

1

S r O_{2}

2

A l_{2} O_{3}

3

C a C l_{2}

4

C u_{2} C l_{2}

Explanation:

Corundum is best known for its gem varieties, Ruby and Sapphire. Corundum is a very hard, tough, and stable mineral.
Chemical formula of corundum is $A l_{2} O_{3}$

GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS

25817 Which is not a mineral of aluminium

1 Anhydrite

2 Bauxite

3 Corundum

4 Diaspore

Explanation:

Bauxite $(A l_{2} O_{3} .2 H_{2} O)$
Corundum $(A l_{2} O_{3})$
Diaspore $(A l_{2} O_{3} . H_{2} O)$

GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS

25818 Which of the following mineral does not contain $A l$

1 Cryolite

2 Mica

3 Feldspar

4 Fluorspar

Explanation:

Fluorspar $(C a F_{2})$ ,
Cryolite $(N a_{3} A l F_{6})$ ,
Feldspar $(K A l S i_{3} O_{8})$ ,
Mica $(K_{2} O .3 A l_{2} O_{3} .6 S i O_{2} .2 H_{2} O)$

GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS

25819 An important oxide ore of iron is

1 Haematite

2 Siderite

3 Pyrites

4 Malachite

Explanation:

(a)Haematite $F e_{2} O_{3}$

GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS

25820 Which ore is used for the manufacture of iron

1 Cryolite

2 Bauxite

3 Haematite

4 Chalcopyrites

GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS

25816 Corundum is

1

S r O_{2}

2

A l_{2} O_{3}

3

C a C l_{2}

4

C u_{2} C l_{2}

Explanation:

Corundum is best known for its gem varieties, Ruby and Sapphire. Corundum is a very hard, tough, and stable mineral.
Chemical formula of corundum is $A l_{2} O_{3}$

GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS

25817 Which is not a mineral of aluminium

1 Anhydrite

2 Bauxite

3 Corundum

4 Diaspore

Explanation:

Bauxite $(A l_{2} O_{3} .2 H_{2} O)$
Corundum $(A l_{2} O_{3})$
Diaspore $(A l_{2} O_{3} . H_{2} O)$

GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS

25818 Which of the following mineral does not contain $A l$

1 Cryolite

2 Mica

3 Feldspar

4 Fluorspar

Explanation:

Fluorspar $(C a F_{2})$ ,
Cryolite $(N a_{3} A l F_{6})$ ,
Feldspar $(K A l S i_{3} O_{8})$ ,
Mica $(K_{2} O .3 A l_{2} O_{3} .6 S i O_{2} .2 H_{2} O)$

GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS

25819 An important oxide ore of iron is

1 Haematite

2 Siderite

3 Pyrites

4 Malachite

Explanation:

(a)Haematite $F e_{2} O_{3}$

GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS

25820 Which ore is used for the manufacture of iron

1 Cryolite

2 Bauxite

3 Haematite

4 Chalcopyrites

GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS

25816 Corundum is

1

S r O_{2}

2

A l_{2} O_{3}

3

C a C l_{2}

4

C u_{2} C l_{2}

Explanation:

Corundum is best known for its gem varieties, Ruby and Sapphire. Corundum is a very hard, tough, and stable mineral.
Chemical formula of corundum is $A l_{2} O_{3}$

GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS

25817 Which is not a mineral of aluminium

1 Anhydrite

2 Bauxite

3 Corundum

4 Diaspore

Explanation:

Bauxite $(A l_{2} O_{3} .2 H_{2} O)$
Corundum $(A l_{2} O_{3})$
Diaspore $(A l_{2} O_{3} . H_{2} O)$

GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS

25818 Which of the following mineral does not contain $A l$

1 Cryolite

2 Mica

3 Feldspar

4 Fluorspar

Explanation:

Fluorspar $(C a F_{2})$ ,
Cryolite $(N a_{3} A l F_{6})$ ,
Feldspar $(K A l S i_{3} O_{8})$ ,
Mica $(K_{2} O .3 A l_{2} O_{3} .6 S i O_{2} .2 H_{2} O)$

GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS

25819 An important oxide ore of iron is

1 Haematite

2 Siderite

3 Pyrites

4 Malachite

Explanation:

(a)Haematite $F e_{2} O_{3}$

GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS

25820 Which ore is used for the manufacture of iron

1 Cryolite

2 Bauxite

3 Haematite

4 Chalcopyrites

GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS

25816 Corundum is

1

S r O_{2}

2

A l_{2} O_{3}

3

C a C l_{2}

4

C u_{2} C l_{2}

Explanation:

Corundum is best known for its gem varieties, Ruby and Sapphire. Corundum is a very hard, tough, and stable mineral.
Chemical formula of corundum is $A l_{2} O_{3}$

GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS

25817 Which is not a mineral of aluminium

1 Anhydrite

2 Bauxite

3 Corundum

4 Diaspore

Explanation:

Bauxite $(A l_{2} O_{3} .2 H_{2} O)$
Corundum $(A l_{2} O_{3})$
Diaspore $(A l_{2} O_{3} . H_{2} O)$

GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS

25818 Which of the following mineral does not contain $A l$

1 Cryolite

2 Mica

3 Feldspar

4 Fluorspar

Explanation:

Fluorspar $(C a F_{2})$ ,
Cryolite $(N a_{3} A l F_{6})$ ,
Feldspar $(K A l S i_{3} O_{8})$ ,
Mica $(K_{2} O .3 A l_{2} O_{3} .6 S i O_{2} .2 H_{2} O)$

GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS

25819 An important oxide ore of iron is

1 Haematite

2 Siderite

3 Pyrites

4 Malachite

Explanation:

(a)Haematite $F e_{2} O_{3}$

GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS

25820 Which ore is used for the manufacture of iron

1 Cryolite

2 Bauxite

3 Haematite

4 Chalcopyrites

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