| 1 |
Which metal is used in the thermite process because of its activity. |
- A. Iron
- B. Copper
- C. Aluminium
- D. Zinc
|
| 2 |
Which is not used of Borax |
- A. Softening of water
- B. As medicine for washing eyes
- C. As flux in metallurgical operations
- D. To make quartz
|
| 3 |
Boric acid is used as eye wash due to its |
- A. Weakly acidic property
- B. Antiseptic nature
- C. Antibiotic nature
- D. Weakly basic properties
|
| 4 |
Third abundant element on earth crust is. |
- A. Boron
- B. Oxygen
- C. Aluminium
- D. Silicon
|
| 5 |
Which one of following is used in cosmetics |
- A. Talc
- B. Asbestos
- C. Sodium sulphate
- D. Aluminium Sulphate
|
| 6 |
Which are correct oxidation states for lead |
- A. +1, +2
- B. +3 , +5
- C. +2 ,+4
- D. +4 only
|
| 7 |
Tincal is a mineral of. |
|
| 8 |
Aluminum oxide is |
- A. acidic oxide
- B. basic oxide
- C. amphoteric oxide
- D. none of these
|
| 9 |
Which element form an ion with charge +3 |
- A. Beryllium
- B. Aluminum
- C. Carbon
- D. Sillicon
|
| 10 |
Ethyl alcohol on reacting with orthoboric acid form |
- A. Ethyl borate
- B. Boric acid
- C. Boron acetate
- D. Borax
|