| 1. | Brass gets discoloured in air because of the presence of which of the following gases in air? |
| a. | Oxygen |
| b. | Hydrogen sulphide |
| c. | Carbon dioxide |
| d. | Nitrogen |
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Answer: (b).Hydrogen sulphide
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| 2. | Which of the following is a non metal that remains liquid at room temperature? |
| a. | Phosphorous |
| b. | Bromine |
| c. | Chlorine |
| d. | Helium |
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Answer: (b).Bromine
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| 3. | Chlorophyll is a naturally occurring chelate compound in which central metal is |
| a. | copper |
| b. | magnesium |
| c. | iron |
| d. | calcium |
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Answer: (b).magnesium
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| 4. | Which of the following is used in pencils? |
| a. | Graphite |
| b. | Silicon |
| c. | Charcoal |
| d. | Phosphorous |
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Answer: (a).Graphite
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| 5. | Which of the following metals forms an amalgam with other metals? |
| a. | Tin |
| b. | Mercury |
| c. | Lead |
| d. | Zinc |
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Answer: (b).Mercury
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