- Elements and Metals
- Measurements
- Nuclear Science
- Synthetic Materials
| 1. | Brass gets discoloured in air because of the presence of which of the following gases in air? |
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| 2. | Which of the following is a non metal that remains liquid at room temperature? |
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| 4. | Chlorophyll is a naturally occurring chelate compound in which central metal is |
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| 5. | Which of the following metals forms an amalgam with other metals? |
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