| 1. | Which of the following statement is or are incorrect ? | |
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All metals except mercury exist as solids at room temperature.
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Most non-metals produce acidic oxides when dissolve in water.
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Alkali metals (lithium, sodium, potassium) are so soft that they can be cut with a knife.
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Platinum, is an allotrope of carbon, is the hardest natural substance known and has a very high melting and boiling point.
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Report Question| 2. | Which compound is used in photography ? | |
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AgNO3
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AgCl
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AgBr
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AgO
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| 3. | The constituent of haemoglobin is ? | |
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Magnesium
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Sodium
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Iron
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Copper
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| 4. | Elements with atomic number greater than 92 are also called ? | |
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alkali metals
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alkaline earth metals
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transuranic elements
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noble gas elements
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| 5. | Which of the following statements is correct ? | |
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All ores are minerals
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All ores are minerals
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All minerals are ores
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None is correct
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| 6. | Roasting process is applied to which of them following ores ? | |
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galena
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copper glance
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iron pyrites
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all of these
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| 7. | Permanent magnets can be made from ? | |
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Stainless steel
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Ni steel
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Wrought iron
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Cobalt steel
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| 8. | Which of the following metal cannot displaced hydrogen ? | |
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Gold
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Copper
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Silver
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All of these
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| 9. | The most reactive metal of the following is ? | |
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magnesium
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sodium
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zinc
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iron
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| 10. | The soldering wire is an alloy of ? | |
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Aluminium and lead
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Lead and tin
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Copper and aluminium
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Copper and tin
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