| 1 |
Litharge is chemically |
- A. PbO
- B. PbO2
- C. Pb3O4
- D. Pb(CH3COO)2
|
| 2 |
Which element forms on ion wiht charge 3+ |
- A. Beryllium
- B. Aluminium
- C. Carbon
- D. silicon
|
| 3 |
------------- metal is used in the Thermite process because of its reactivity |
- A. Tron
- B. Copper
- C. Aluminium
- D. Zinc
|
| 4 |
Boron usually exist in nature as |
- A. Borides
- B. Oxborates
- C. Free element
- D. It is a artificial element
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| 5 |
The composition of white lead is |
- A. PbCO3.Ph(OH)2
- B. PbCO3.2Pb(OH)2
- C. 2PbCO3.Pb(OH)2
- D. PbCO3
|
| 6 |
Which are correct oxidation states for lead |
- A. +1, +2
- B. +3 , +5
- C. +2 ,+4
- D. +4 only
|
| 7 |
Which is used in the leather industry |
- A. Borax
- B. Boric acid
- C. Boric oxide
- D. Tetra Boric acid
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| 8 |
Which substances is called chrome yellow. |
- A. Pb3O4
- B. PbO
- C. 2PbCO3.Pb(OH)2
- D. PbCrO4
|
| 9 |
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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| 10 |
Which one of the following elements exhibits s-inert pair effect. |
|