| 1. | Which of the following element is a metalloid ? | |
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Calcium
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Carbon
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Silicon
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Nitrogen
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Report Question| 2. | Which of the following is the best conductor of electricity ? | |
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Mercury
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Aluminium
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Gold
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Copper
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| 3. | The stainless steel is an alloy of ? | |
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Iron and nickel
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Iron and chromium
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Iron, nickel and chromium
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Nickel and chromium
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| 4. | Iron is galvanized by coating it with, ? | |
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zinc
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manganese
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nickel
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chromium
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| 5. | Which of the following metals exist in their native state in nature ? | |
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Au and Ag
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Zn and Ag
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Au and Zn
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Cu and Au
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| 6. | The poorest conductor of heat among metals is ? | |
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Mercury
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Sodium
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Lead
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Calcium
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| 7. | Example of an amphoteric oxide is ? | |
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MgO
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Na2O
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K2O
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Al2O3
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| 8. | Copper objects lose their shine and form green coating of ? | |
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Copper carbonate
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Basic Copper carbonate
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Copper hydroxide and Copper oxide
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Copper oxide
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| 9. | The most abundant element in the universe is ? | |
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Oxygen
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Hydrogen
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Carbon
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Helium
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| 10. | The composition of aqua-regia is ? | |
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Conc.HCl (3) : Conc.HNO3 (1)
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Dil.HCl (3) : Dil.HNO3 (1)
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Dil. HCl (3) : Conc. HNO3 (1)
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Conc.HCl (3) : Dil. HNO3 (1)
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