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| Q. |
What is the most common salt in sea water? |
| A. | Calcium carbonate |
| B. | Potassium chloride |
| C. | Sodium chloride |
| D. | Magnesium sulphate |
| Answer» C. Sodium chloride | |
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Explanation: Sodium chloride, also known as salt, common salt, table salt or halite, is an ionic compound with the formula NaCl, representing equal proportions of sodium and chloride. Sodium chloride is the salt most responsible for the salinity of the ocean and of the extracellular fluid of many multi-cellular organisms. |
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