Q. The gas fixed by bacteria is

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Q. Elements in lithosphere exist generally as

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Q. Oxygen in atmosphere is

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Q. One of the oxidizing agents is eye irritant and toxic to plants

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Q. August Smith discovered in the mid of 17th century

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Q. Which one of the following is least toxic among the given?

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Q. Excessive supply of CO causes

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Q. Coagulation removes suspended particles in rainwater

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Q. The percentage of Nitrogen in the atmosphere is

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Q. Primary pollutants include

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Q. Injection of heavy metals can cause diseases

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Q. Leather tanneries cause water pollution by converting Cr-VI into Cr with oxidation state

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Q. Chemicals used to kill insects are

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Q. Most common recycled domestic materials are

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Q. Petroleum or crude oil is a complex mixture of compounds mainly

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Q. Aerosols cause serious infections in old people of

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Q. NOₓ in atmosphere is converted into

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Q. The main source of Carbon monoxide is

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Q. Freshwater total earth's water is

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Q. Leather tanneries use big quantities of

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