1 |
In which compound, the oxidation state of boron in not +3 |
- A. H2BO3
- B. Ca2B2O11
- C. Na2B4O7
- D. Mg3B2
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2 |
Which element among the following belongs to Group IV A of the Periodic table. |
- A. Barium
- B. Iodine
- C. Lead
- D. Oxygen
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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 |
Aluminium does not corrode because. |
- A. It is a semi metal
- B. It is a silver shining metal
- C. It does not react with O2
- D. It forms a protective layer of Al2O3
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5 |
In which substance silicon is not present. |
- A. Talc
- B. Asbestos
- C. Dolomite
- D. Zirocon
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6 |
Which metal is used in the thermite process because of its activity. |
- A. Iron
- B. Copper
- C. Aluminium
- D. Zinc
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7 |
Which of the following elements is not present abundantly in earth's crust. |
- A. Silicon
- B. Aluminium
- C. Sodium
- D. Oxygen
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8 |
Aluminum oxide is |
- A. acidic oxide
- B. basic oxide
- C. amphoteric oxide
- D. none of these
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9 |
Corundum is |
- A. Al2O3
- B. Na2AlF6
- C. Quartz
- D. Calcium
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10 |
Litharge is chemically |
- A. PbO
- B. PbO2
- C. Pb3O4
- D. Pb(CH3COO)2
|