| 1 |
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
|
| 2 |
Which element burns in nitrogen atmosphere to form nitride. |
- A. Mg
- B. Al
- C. Both a and b
- D. None of these
|
| 3 |
Boric acid can not be used. |
- A. As antiseptic in medicine
- B. For washing eyes
- C. In soda bottle
- D. For enamels and glazes
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| 4 |
The aqueous solution of Borax |
- A. Acidic
- B. alkaline
- C. Amphoteric
- D. manual
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| 5 |
Which metal is used in the thermite process because of its activity. |
- A. Iron
- B. Copper
- C. Aluminium
- D. Zinc
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| 6 |
Which one of following is used in cosmetics |
- A. Talc
- B. Asbestos
- C. Sodium sulphate
- D. Aluminium Sulphate
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| 7 |
Which one of the followings is not ore of aluminium |
- A. Coruridum
- B. Bauxite
- C. Colemanite
- D. Kaolin
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| 8 |
Corundum is |
- A. Al2O3
- B. Na2AlF6
- C. Quartz
- D. Calcium
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| 9 |
silicones are |
- A. Some salts of sodium
- B. Allotropes of SI
- C. Inorganic polymers
- D. Coloured compounds of Si
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| 10 |
------------- metal is used in the Thermite process because of its reactivity |
- A. Tron
- B. Copper
- C. Aluminium
- D. Zinc
|