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Questions and Answers
Why are food cans coated with tin and not with zinc?
Why are food cans coated with tin and not with zinc?
- Zinc is more reactive than tin. (correct)
- Zinc has a higher melting point than tin.
- Zinc is costlier than tin.
- Zinc is less reactive than tin.
Which of the following pairs will give displacement reactions?
Which of the following pairs will give displacement reactions?
- AgNO3 solution and copper metal (correct)
- FeSO4 solution and silver metal
- MgCl2 solution and aluminium metal
- NaCl solution and copper metal
Which method is suitable for preventing an iron frying pan from rusting?
Which method is suitable for preventing an iron frying pan from rusting?
- Applying a coating of zinc (correct)
- Applying grease
- Applying paint
- Applying a coating of copper
An element reacts with oxygen to give a compound with a high melting point and is soluble in water. The element is likely to be:
An element reacts with oxygen to give a compound with a high melting point and is soluble in water. The element is likely to be:
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How could you use a hammer, a battery, a bulb, wires, and a switch to distinguish between samples of metals and nonmetals?
How could you use a hammer, a battery, a bulb, wires, and a switch to distinguish between samples of metals and nonmetals?
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In a population of an asexually reproducing species, if trait A exists in 10% and trait B exists in 60%, which trait is likely to have arisen earlier?
In a population of an asexually reproducing species, if trait A exists in 10% and trait B exists in 60%, which trait is likely to have arisen earlier?
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How do variations in a species promote survival?
How do variations in a species promote survival?
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