| 1 |
Aluminum oxide is |
- A. acidic oxide
- B. basic oxide
- C. amphoteric oxide
- D. none of these
|
| 2 |
Which substances is called chrome yellow. |
- A. Pb3O4
- B. PbO
- C. 2PbCO3.Pb(OH)2
- D. PbCrO4
|
| 3 |
Which of the following elements is not present abundantly in earth's crust |
- A. Silicon
- B. Aluminium
- C. Sodium
- D. Oxygen
|
| 4 |
Chemical composition of colemanite is |
- A. Ca<sub>2</sub>B<sub>6</sub>O<sub>11</sub>. 5H<sub>2</sub>O
- B. CaB<sub>4</sub>O<sub>7</sub>. 4H<sub>2</sub>O
- C. Na<sub>2</sub>B<sub>4</sub>O<sub>7</sub>.4H<sub>2</sub>O
- D. CaNaB<sub>5</sub>O<sub>9</sub>. 8H<sub>2</sub>O
|
| 5 |
Ethyl alcohol on reacting with orthoboric acid form |
- A. Ethyl borate
- B. Boric acid
- C. Boron acetate
- D. Borax
|
| 6 |
Boric acid can not be used. |
- A. As antiseptic in medicine
- B. For washing eyes
- C. In soda bottle
- D. For enamels and glazes
|
| 7 |
Which one of the following elements exhibits s-inert pair effect. |
|
| 8 |
Which element among the following belongs to Group IV A of the Periodic table. |
- A. Barium
- B. Iodine
- C. Lead
- D. Oxygen
|
| 9 |
Aluminium oxide is. |
- A. Acidic oxide
- B. Basic oxide
- C. Amphoteric oxide
- D. None of these
|
| 10 |
In which compound, the oxidation state of boron in not +3 |
- A. H2BO3
- B. Ca2B2O11
- C. Na2B4O7
- D. Mg3B2
|