Question:
Some amount of carbon dissolved into oceanic water remains as sediments of carbon in the sea in the form of __________ and is removed from circulation.
Some amount of carbon dissolved into oceanic water remains as sediments of carbon in the sea in the form of __________ and is removed from circulation.
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Dissolved carbon dioxide forms carbonate ions that combine with calcium and magnesium and settle down.
Updated On: Nov 12, 2026
- carbonates of Na and K
- carbohydrate
- carbonates of Ca and Mg
- carbonic acid
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Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
Carbon dioxide dissolving in sea water forms carbonic acid, which gives bicarbonate and carbonate ions.
Step 2: Sedimentation
Carbonate ions combine with calcium and magnesium of sea water to form insoluble \(\text{CaCO}_3\) and \(\text{MgCO}_3\). These are also found in shells and coral skeletons and settle as sediments, later forming limestone and dolomite.
Step 3: Conclusion
Carbon locked this way leaves circulation. Sodium and potassium carbonates are soluble and do not settle. So it is held as carbonates of Ca and Mg.
Final Answer:
The carbon remains as carbonates of calcium and magnesium. \[ \boxed{\text{(C) }\text{carbonates of Ca and Mg}} \]
Carbon dioxide dissolving in sea water forms carbonic acid, which gives bicarbonate and carbonate ions.
Step 2: Sedimentation
Carbonate ions combine with calcium and magnesium of sea water to form insoluble \(\text{CaCO}_3\) and \(\text{MgCO}_3\). These are also found in shells and coral skeletons and settle as sediments, later forming limestone and dolomite.
Step 3: Conclusion
Carbon locked this way leaves circulation. Sodium and potassium carbonates are soluble and do not settle. So it is held as carbonates of Ca and Mg.
Final Answer:
The carbon remains as carbonates of calcium and magnesium. \[ \boxed{\text{(C) }\text{carbonates of Ca and Mg}} \]
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