| 1 |
Which substance is water repellant and used in ceramic insulators. |
- A. Asbestos
- B. Lead compounds
- C. Silicon carbide
- D. silicones
|
| 2 |
Which of the following elements is not present abundantly in earth's crust |
- A. Silicon
- B. Aluminium
- C. Sodium
- D. Oxygen
|
| 3 |
In which compound, the oxidation state of boron in not +3 |
- A. H2BO3
- B. Ca2B2O11
- C. Na2B4O7
- D. Mg3B2
|
| 4 |
Which metal is used in the thermite process because of its activity. |
- A. Iron
- B. Copper
- C. Aluminium
- D. Zinc
|
| 5 |
Boric acid is used as eye wash due to its |
- A. Weakly acidic property
- B. Antiseptic nature
- C. Antibiotic nature
- D. Weakly basic properties
|
| 6 |
Which electronic configuration corresponds to an element of group III-A of the Periodic Table |
- A. 1s<sup>2</sup>,2s<sup>2</sup>,2p<sup>6</sup>,3s<sup>2</sup>,3p<sup>1</sup>
- B. 1s<sup>2</sup>,2s<sup>2</sup>,2p<sup>6</sup>,3s<sup>2</sup>,3p<sup>6</sup>,4s<sup>6</sup>
- C. 1s<sup>2</sup>,2s<sup>2</sup>,2p<sup>6</sup>
- D. 1s<sup>2</sup>,2s<sup>2</sup>,3s<sup>2</sup>,3p<sup>3</sup>
|
| 7 |
Which element form an ion with charge +3 |
- A. Beryllium
- B. Aluminum
- C. Carbon
- D. Sillicon
|
| 8 |
------------- metal is used in the Thermite process because of its reactivity |
- A. Tron
- B. Copper
- C. Aluminium
- D. Zinc
|
| 9 |
Which one of the following compounds of lead is red in colour |
- A. PbO
- B. Pb2O
- C. Pb3O4
- D. PbCO3
|
| 10 |
silicones are |
- A. Some salts of sodium
- B. Allotropes of SI
- C. Inorganic polymers
- D. Coloured compounds of Si
|