| 1 |
Which element form an ion with charge +3 |
- A. Beryllium
- B. Aluminum
- C. Carbon
- D. Sillicon
|
| 2 |
Boron usually exist in nature as |
- A. Borides
- B. Oxborates
- C. Free element
- D. It is a artificial element
|
| 3 |
Third abundant element on earth crust is. |
- A. Boron
- B. Oxygen
- C. Aluminium
- D. Silicon
|
| 4 |
A solution of borax in water is. |
- A. Acidic
- B. Alkaline
- C. Neutral
- D. None of these
|
| 5 |
Which element forms on ion wiht charge 3+ |
- A. Beryllium
- B. Aluminium
- C. Carbon
- D. silicon
|
| 6 |
Aluminium oxide is. |
- A. Acidic oxide
- B. Basic oxide
- C. Amphoteric oxide
- D. None of these
|
| 7 |
Ortho boric acid on strong beating gives. |
- A. Borax
- B. Boron oxide
- C. Metaboric acid
- D. Tetraboric acid
|
| 8 |
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
|
| 9 |
The chief of aluminum is |
- A. Na<sub>3</sub>AlF<sub>6</sub>
- B. Al<sub>2</sub>O<sub>3</sub>.2H<sub>2</sub>O
- C. Al<sub>2</sub>O<sub>3</sub>
- D. Al<sub>2</sub>O<sub>3</sub>.H<sub>2</sub>O
|
| 10 |
In which substance silicon is not present. |
- A. Talc
- B. Asbestos
- C. Dolomite
- D. Zirocon
|