Rising levels of atmospheric carbon dioxide will cause which of the following changes in oceanic chemistry?

Increased precipitation of calcium carbonate

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Increased salinity

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Decreased pH

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Decreased salinity

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Solution

The correct option is C Decreased pH
Rising level of $C O_{2}$ causes increase in the acidity of ocean water thereby decreasing the pH. In water $C O_{2}$ reacts with $H_{2} O$ molecule to form $H_{2} C O_{3}$ i.e; carbonic acid, which then breaks down to $H^{+}$ and ${H C O_{3}}^{-}$ .

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