Which of the following is not a water pollutant?

Metal nitrates

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Sewage

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Oxygen

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Human excreta

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Solution

The correct option is C Oxygen
Oxygen is a constituent of water ( $H_{2} O$ ). Others-metal nitrates, sewage, human excrete are organic wastes and inorganic waste that pollutes water bodies which makes it difficult for water animals to live underwater, whereas oxygen is helpful for the underwater organisms.

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Which worm among the following is used to decompose the human excreta?

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