| 1. | The highly reactive metals like Sodium, Potassium, Magnesium, etc. are extracted by the ? | |
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reduction by carbon
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reduction by aluminium
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electrolysis of their molten chloride
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electrolysis of their molten oxides
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Report Question| 2. | Which is the least conductor of heat ? | |
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Silver
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Platinum
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Gold
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Lead
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| 3. | Galvanisation is a method of protecting iron from rusting by coating with a thin layer of ? | |
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Zinc
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Silver
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Gallium
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Aluminium
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| 4. | Metal have ______ no. of electrons in their outer most shell ? | |
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10 to 12
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7 to 9
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1 to 3
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1 to 8
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| 5. | An element X is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following ? | |
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Ca
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P
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Na
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Mg
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| 6. | Which of the following pairs will give displacement reactions ? | |
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NaCl solution and Copper metal
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CuSO4 solution and Silver metal
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FeSO4 solution and Copper metal
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AgNO3 solution and Copper metal
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| 7. | The most abundant metal in the earth’s crust is ? | |
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Sodium
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Calcium
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Iron
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Aluminium
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| 8. | A purple-coloured solid halogen is ? | |
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Br
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I
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CI
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F
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| 9. | Which of the following is a ferrous alloy ? | |
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Magnalium
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Steel
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Brass
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Solder
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| 10. | Copper is extracted from low grade ore by ? | |
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electrometallurgy
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pyrometallurgy
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hydrometallurgy
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all of the above processes
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