On heating Al at 800°C in air, Al2O3 is formed. The reaction is:

1.  an endothermic reaction

2.  an exothermic reaction

3.  reduction of aluminium

4.  none of the above

Subtopic:  Boron Family- Preparations, Properties & Uses |
 58%
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Alumina on heating with carbon in nitrogen atmosphere gives:

1.  Al+CO

2.  Al+CO2

3.  AlN+CO

4.  Al+CO+N2

Subtopic:  Boron Family- Preparations, Properties & Uses |
 54%
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Hoope's process is used in the refining of:

1.  Al

2.  Zn

3.  Ag

4.  Cu

Subtopic:  Boron Family- Preparations, Properties & Uses |
 71%
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The correct order of decreasing hardness of the following compounds is:

1.  Diamond > Borazon > Carborundum > Corundum

2.  Borazon > Diamond > Carborundum > Corundum

3.  Corundum > Carborundum > Borazon > Diamond

4.  none of the above

Subtopic:  Boron Family- Preparations, Properties & Uses |
 83%
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Aluminium becomes passive in nitric acid because it-

1. Is a noble metal

2. Forms a thin film of oxide

3. Has a positive reduction potential

4.  None of the above

Subtopic:  Boron Family- Preparations, Properties & Uses |
 92%
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Chemically thermite is -

1.  Fe and Al

2.  Ferric oxide and aluminium powder

3.  Barium peroxide and magnesium powder

4.  Cu and aluminium

Subtopic:  Boron Family- Preparations, Properties & Uses |
 70%
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Al2O3 formation involves large quantity of heat evolution which makes its use in:

1.  deoxidizer

2.  confectionary

3.  indoor photography

4.  thermite welding

Subtopic:  Boron Family- Preparations, Properties & Uses |
 87%
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Al and Ga have the same covalent radii because of:

1. Greater shielding power of s-electrons of Ga atoms

2. Poor shielding power of s-electrons of Ga atoms

3. Poor shielding power of d-electrons of Ga atoms

4. Greater shielding power of d-electrons of Ga atoms

Subtopic:  Boron Family- Preparations, Properties & Uses |
 84%
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Which is used as mordant?

1.  AlCl3

2.  Al2SO43

3.  Alum

4.  Al2O3

Subtopic:  Boron Family- Preparations, Properties & Uses |
 56%
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Hybridisation of boron in diborane is:

1.  sp

2.  sp2

3.  sp3

4.  sp3d2

Subtopic:  Boron Family- Preparations, Properties & Uses |
 72%
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