Which of the following elements was unknown to ancient civilizations?
tin
aluminum
mercury
sulfur
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Which of the following is not a major pollutant from automobiles? |
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The characteristic odour of Garlic is due to which one of the following? |
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Which acid is produced when milk gets sour? |
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When an ant bites a person, which irritating chemical it (ant) injects into his (person) body? |
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Washing soda is the common name for |
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Which one of the following is used as an explosive? |
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Which one of the following is not a radioactive element? |
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Chemically, lime water is |
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A gas used as a disinfectant in drinking water is |
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