EXAMIANS
The smog is essentially caused by the presence of
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The presence of ozone in the stratosphere is responsible for
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________ is used for making vinegar.
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The amount of chlorine available in water after disinfection is called as
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Which one of the following is extensively used for sterilizing water ?
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If the sewage is fully oxidized, the nitrogen is in the form of
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Lead pencil contains
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An atom of an element has atomic number 17 and mass number 36. The number of neutrons in its nucleus is
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The first organic compound synthesised in the laboratory was
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Hardness of the water is commonly measured in terms of
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